35 files changed, 4322 insertions, 509 deletions

diff --git a/src/Generating/BioGen.cpp b/src/Generating/BioGen.cpp
index 3ee0bd4c5..2a4dbe794 100644
--- a/src/Generating/BioGen.cpp
+++ b/src/Generating/BioGen.cpp
@@ -5,7 +5,11 @@
 
 #include "Globals.h"
 #include "BioGen.h"
-#include "inifile/iniFile.h"
+#include <chrono>
+#include <iostream>
+#include "IntGen.h"
+#include "ProtIntGen.h"
+#include "../IniFile.h"
 #include "../LinearUpscale.h"
 
 
@@ -45,7 +49,7 @@ void cBioGenConstant::InitializeBiomeGen(cIniFile & a_IniFile)
 ////////////////////////////////////////////////////////////////////////////////
 // cBioGenCache:
 
-cBioGenCache::cBioGenCache(cBiomeGen * a_BioGenToCache, int a_CacheSize) :
+cBioGenCache::cBioGenCache(cBiomeGenPtr a_BioGenToCache, int a_CacheSize) :
 	m_BioGenToCache(a_BioGenToCache),
 	m_CacheSize(a_CacheSize),
 	m_CacheOrder(new int[a_CacheSize]),
@@ -69,9 +73,9 @@ cBioGenCache::cBioGenCache(cBiomeGen * a_BioGenToCache, int a_CacheSize) :
 cBioGenCache::~cBioGenCache()
 {
 	delete[] m_CacheData;
-	m_CacheData = NULL;
+	m_CacheData = nullptr;
 	delete[] m_CacheOrder;
-	m_CacheOrder = NULL;
+	m_CacheOrder = nullptr;
 }
 
 
@@ -145,25 +149,13 @@ void cBioGenCache::InitializeBiomeGen(cIniFile & a_IniFile)
 ////////////////////////////////////////////////////////////////////////////////
 // cBioGenMulticache:
 
-cBioGenMulticache::cBioGenMulticache(cBiomeGen * a_BioGenToCache, size_t a_CacheSize, size_t a_CachesLength) :
-	m_CachesLength(a_CachesLength)
+cBioGenMulticache::cBioGenMulticache(cBiomeGenPtr a_BioGenToCache, size_t a_SubCacheSize, size_t a_NumSubCaches) :
+	m_NumSubCaches(a_NumSubCaches)
 {
-	m_Caches.reserve(a_CachesLength);
-	for (size_t i = 0; i < a_CachesLength; i++)
+	m_Caches.reserve(a_NumSubCaches);
+	for (size_t i = 0; i < a_NumSubCaches; i++)
 	{
-		m_Caches.push_back(new cBioGenCache(a_BioGenToCache, a_CacheSize));
-	}
-}
-
-
-
-
-
-cBioGenMulticache::~cBioGenMulticache()
-{
-	for (cBiomeGens::iterator it = m_Caches.begin(); it != m_Caches.end(); it++)
-	{
-		delete *it;
+		m_Caches.push_back(cBiomeGenPtr(new cBioGenCache(a_BioGenToCache, a_SubCacheSize)));
 	}
 }
 
@@ -174,7 +166,7 @@ cBioGenMulticache::~cBioGenMulticache()
 void cBioGenMulticache::GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap)
 {
 	const size_t coefficient = 3;
-	const size_t cacheIdx = ((size_t)a_ChunkX + coefficient * (size_t)a_ChunkZ) % m_CachesLength;
+	const size_t cacheIdx = ((size_t)a_ChunkX + coefficient * (size_t)a_ChunkZ) % m_NumSubCaches;
 
 	m_Caches[cacheIdx]->GenBiomes(a_ChunkX, a_ChunkZ, a_BiomeMap);
 }
@@ -185,10 +177,9 @@ void cBioGenMulticache::GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMa
 
 void cBioGenMulticache::InitializeBiomeGen(cIniFile & a_IniFile)
 {
-	for (cBiomeGens::iterator it = m_Caches.begin(); it != m_Caches.end(); it++)
+	for (auto itr : m_Caches)
 	{
-		cBiomeGen * tmp = *it;
-		tmp->InitializeBiomeGen(a_IniFile);
+		itr->InitializeBiomeGen(a_IniFile);
 	}
 }
 
@@ -737,8 +728,6 @@ void cBioGenMultiStepMap::FreezeWaterBiomes(cChunkDef::BiomeMap & a_BiomeMap, co
 cBioGenTwoLevel::cBioGenTwoLevel(int a_Seed) :
 	m_VoronoiLarge(a_Seed + 1000),
 	m_VoronoiSmall(a_Seed + 2000),
-	m_DistortX(a_Seed + 3000),
-	m_DistortZ(a_Seed + 4000),
 	m_Noise1(a_Seed + 5001),
 	m_Noise2(a_Seed + 5002),
 	m_Noise3(a_Seed + 5003),
@@ -762,19 +751,17 @@ void cBioGenTwoLevel::GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap
 	int DistortZ[cChunkDef::Width + 1][cChunkDef::Width + 1];
 	for (int x = 0; x <= 4; x++) for (int z = 0; z <= 4; z++)
 	{
-		int BlockX = BaseX + x * 4;
-		int BlockZ = BaseZ + z * 4;
-		float BlockXF = (float)(16 * BlockX) / 128;
-		float BlockZF = (float)(16 * BlockZ) / 128;
-		double NoiseX =  m_Noise1.CubicNoise2D(BlockXF / 16, BlockZF / 16);
-		NoiseX += 0.5  * m_Noise2.CubicNoise2D(BlockXF / 8,  BlockZF / 8);
-		NoiseX += 0.08 * m_Noise3.CubicNoise2D(BlockXF,      BlockZF);
-		double NoiseZ  = m_Noise4.CubicNoise2D(BlockXF / 16, BlockZF / 16);
-		NoiseZ += 0.5  * m_Noise5.CubicNoise2D(BlockXF / 8,  BlockZF / 8);
-		NoiseZ += 0.08 * m_Noise6.CubicNoise2D(BlockXF,      BlockZF);
+		float BlockX = static_cast<float>(BaseX + x * 4);
+		float BlockZ = static_cast<float>(BaseZ + z * 4);
+		double NoiseX = m_AmpX1 * m_Noise1.CubicNoise2D(BlockX * m_FreqX1, BlockZ * m_FreqX1);
+		NoiseX       += m_AmpX2 * m_Noise2.CubicNoise2D(BlockX * m_FreqX2, BlockZ * m_FreqX2);
+		NoiseX       += m_AmpX3 * m_Noise3.CubicNoise2D(BlockX * m_FreqX3, BlockZ * m_FreqX3);
+		double NoiseZ = m_AmpZ1 * m_Noise4.CubicNoise2D(BlockX * m_FreqZ1, BlockZ * m_FreqZ1);
+		NoiseZ       += m_AmpZ2 * m_Noise5.CubicNoise2D(BlockX * m_FreqZ2, BlockZ * m_FreqZ2);
+		NoiseZ       += m_AmpZ3 * m_Noise6.CubicNoise2D(BlockX * m_FreqZ3, BlockZ * m_FreqZ3);
 		
-		DistortX[4 * x][4 * z] = BlockX + (int)(64 * NoiseX);
-		DistortZ[4 * x][4 * z] = BlockZ + (int)(64 * NoiseZ);
+		DistortX[4 * x][4 * z] = (int)(BlockX + NoiseX);
+		DistortZ[4 * x][4 * z] = (int)(BlockZ + NoiseZ);
 	}
 	
 	LinearUpscale2DArrayInPlace<cChunkDef::Width + 1, cChunkDef::Width + 1, 4, 4>(&DistortX[0][0]);
@@ -789,7 +776,7 @@ void cBioGenTwoLevel::GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap
 			int BiomeGroup = m_VoronoiLarge.GetValueAt(DistortX[x][z], DistortZ[x][z], SeedX, SeedZ, MinDist2) / 7;
 			int BiomeIdx   = m_VoronoiSmall.GetValueAt(DistortX[x][z], DistortZ[x][z], SeedX, SeedZ, MinDist2) / 11;
 			int MinDist1 = (DistortX[x][z] - SeedX) * (DistortX[x][z] - SeedX) + (DistortZ[x][z] - SeedZ) * (DistortZ[x][z] - SeedZ);
-			cChunkDef::SetBiome(a_BiomeMap, x, z, SelectBiome(BiomeGroup, BiomeIdx, (MinDist1 < MinDist2 / 4) ? 0 : 1));
+			cChunkDef::SetBiome(a_BiomeMap, x, z, SelectBiome(BiomeGroup, BiomeIdx, (MinDist1 < MinDist2 / 4) ? 1 : 0));
 		}
 	}
 }
@@ -915,30 +902,18 @@ void cBioGenTwoLevel::InitializeBiomeGen(cIniFile & a_IniFile)
 {
 	m_VoronoiLarge.SetCellSize(a_IniFile.GetValueSetI("Generator", "TwoLevelLargeCellSize", 1024));
 	m_VoronoiSmall.SetCellSize(a_IniFile.GetValueSetI("Generator", "TwoLevelSmallCellSize", 128));
-	m_DistortX.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave1Freq", 0.01),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave1Amp",  16)
-	);
-	m_DistortX.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave2Freq", 0.005),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave2Amp",  8)
-	);
-	m_DistortX.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave3Freq", 0.0025),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave3Amp",  4)
-	);
-	m_DistortZ.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave1Freq", 0.01),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave1Amp",  16)
-	);
-	m_DistortZ.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave2Freq", 0.005),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave2Amp",  8)
-	);
-	m_DistortZ.AddOctave(
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave3Freq", 0.0025),
-		(float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave3Amp",  4)
-	);
+	m_FreqX1 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave1Freq", 0.01);
+	m_AmpX1  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave1Amp",  80);
+	m_FreqX2 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave2Freq", 0.05);
+	m_AmpX2  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave2Amp",  20);
+	m_FreqX3 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave3Freq", 0.1),
+	m_AmpX3  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortXOctave3Amp",  8);
+	m_FreqZ1 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave1Freq", 0.01);
+	m_AmpZ1  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave1Amp",  80);
+	m_FreqZ2 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave2Freq", 0.05);
+	m_AmpZ2  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave2Amp",  20);
+	m_FreqZ3 = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave3Freq", 0.1);
+	m_AmpZ3  = (float)a_IniFile.GetValueSetF("Generator", "TwoLevelDistortZOctave3Amp",  8);
 }
 
 
@@ -946,9 +921,217 @@ void cBioGenTwoLevel::InitializeBiomeGen(cIniFile & a_IniFile)
 
 
 ////////////////////////////////////////////////////////////////////////////////
+// cBioGenGrown:
+
+class cBioGenGrown:
+	public cBiomeGen
+{
+public:
+	cBioGenGrown(int a_Seed)
+	{
+		auto FinalRivers =
+			std::make_shared<cIntGenSmooth<8>>   (a_Seed + 1,
+			std::make_shared<cIntGenZoom  <10>>  (a_Seed + 2,
+			std::make_shared<cIntGenRiver <7>>   (a_Seed + 3,
+			std::make_shared<cIntGenZoom  <9>>   (a_Seed + 4,
+			std::make_shared<cIntGenSmooth<6>>   (a_Seed + 5,
+			std::make_shared<cIntGenZoom  <8>>   (a_Seed + 8,
+			std::make_shared<cIntGenSmooth<6>>   (a_Seed + 5,
+			std::make_shared<cIntGenZoom  <8>>   (a_Seed + 9,
+			std::make_shared<cIntGenSmooth<6>>   (a_Seed + 5,
+			std::make_shared<cIntGenZoom  <8>>   (a_Seed + 10,
+			std::make_shared<cIntGenSmooth<6>>   (a_Seed + 5,
+			std::make_shared<cIntGenSmooth<8>>   (a_Seed + 6,
+			std::make_shared<cIntGenZoom  <10>>  (a_Seed + 11,
+			std::make_shared<cIntGenChoice<2, 7>>(a_Seed + 12
+		))))))))))))));
+
+		auto alteration =
+			std::make_shared<cIntGenZoom     <8>>(a_Seed,
+			std::make_shared<cIntGenLandOcean<6>>(a_Seed, 20
+		));
+
+		auto alteration2 =
+			std::make_shared<cIntGenZoom     <8>>(a_Seed + 1,
+			std::make_shared<cIntGenZoom     <6>>(a_Seed + 2,
+			std::make_shared<cIntGenZoom     <5>>(a_Seed + 1,
+			std::make_shared<cIntGenZoom     <4>>(a_Seed + 2,
+			std::make_shared<cIntGenLandOcean<4>>(a_Seed + 1, 10
+		)))));
+
+		auto FinalBiomes =
+			std::make_shared<cIntGenSmooth         <8>> (a_Seed + 1,
+			std::make_shared<cIntGenZoom           <10>>(a_Seed + 15,
+			std::make_shared<cIntGenSmooth         <7>> (a_Seed + 1,
+			std::make_shared<cIntGenZoom           <9>> (a_Seed + 16,
+			std::make_shared<cIntGenBeaches        <6>> (
+			std::make_shared<cIntGenZoom           <8>> (a_Seed + 1,
+			std::make_shared<cIntGenAddIslands     <6>> (a_Seed + 2004, 10,
+			std::make_shared<cIntGenAddToOcean     <6>> (a_Seed + 10, 500, biDeepOcean,
+			std::make_shared<cIntGenReplaceRandomly<8>> (a_Seed + 1, biPlains, biSunflowerPlains, 20,
+			std::make_shared<cIntGenMBiomes        <8>> (a_Seed + 5, alteration2,
+			std::make_shared<cIntGenAlternateBiomes<8>> (a_Seed + 1, alteration,
+			std::make_shared<cIntGenBiomeEdges     <8>> (a_Seed + 3,
+			std::make_shared<cIntGenZoom           <10>>(a_Seed + 2,
+			std::make_shared<cIntGenZoom           <7>> (a_Seed + 4,
+			std::make_shared<cIntGenReplaceRandomly<5>> (a_Seed + 99, biIcePlains, biIcePlainsSpikes, 50,
+			std::make_shared<cIntGenZoom           <5>> (a_Seed + 8,
+			std::make_shared<cIntGenAddToOcean     <4>> (a_Seed + 10, 300, biDeepOcean,
+			std::make_shared<cIntGenAddToOcean     <6>> (a_Seed + 9, 8, biMushroomIsland,
+			std::make_shared<cIntGenBiomes         <8>> (a_Seed + 3000,
+			std::make_shared<cIntGenAddIslands     <8>> (a_Seed + 2000, 200,
+			std::make_shared<cIntGenZoom           <8>> (a_Seed + 5,
+			std::make_shared<cIntGenRareBiomeGroups<6>> (a_Seed + 5, 50,
+			std::make_shared<cIntGenBiomeGroupEdges<6>> (
+			std::make_shared<cIntGenAddIslands     <8>> (a_Seed + 2000, 200,
+			std::make_shared<cIntGenZoom           <8>> (a_Seed + 7,
+			std::make_shared<cIntGenSetRandomly    <6>> (a_Seed + 8, 50, bgOcean,
+			std::make_shared<cIntGenReplaceRandomly<6>> (a_Seed + 101, bgIce, bgTemperate, 150,
+			std::make_shared<cIntGenAddIslands     <6>> (a_Seed + 2000, 200,
+			std::make_shared<cIntGenSetRandomly    <6>> (a_Seed + 9, 50, bgOcean,
+			std::make_shared<cIntGenZoom           <6>> (a_Seed + 10,
+			std::make_shared<cIntGenLandOcean      <5>> (a_Seed + 100, 30
+		)))))))))))))))))))))))))))))));
+
+		m_Gen =
+			std::make_shared<cIntGenSmooth   <16>>(a_Seed,
+			std::make_shared<cIntGenZoom     <18>>(a_Seed,
+			std::make_shared<cIntGenSmooth   <11>>(a_Seed,
+			std::make_shared<cIntGenZoom     <13>>(a_Seed,
+			std::make_shared<cIntGenMixRivers<8>> (
+			FinalBiomes, FinalRivers
+		)))));
+	}
+
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_Biomes) override
+	{
+		cIntGen<16, 16>::Values vals;
+		m_Gen->GetInts(a_ChunkX * cChunkDef::Width, a_ChunkZ * cChunkDef::Width, vals);
+		for (int z = 0; z < cChunkDef::Width; z++)
+		{
+			for (int x = 0; x < cChunkDef::Width; x++)
+			{
+				cChunkDef::SetBiome(a_Biomes, x, z, (EMCSBiome)vals[x + cChunkDef::Width * z]);
+			}
+		}
+	}
+
+protected:
+	std::shared_ptr<cIntGen<16, 16>> m_Gen;
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cBioGenGrown:
+
+class cBioGenProtGrown:
+	public cBiomeGen
+{
+public:
+	cBioGenProtGrown(int a_Seed)
+	{
+		auto FinalRivers =
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 1,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 2,
+			std::make_shared<cProtIntGenRiver >(a_Seed + 3,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 4,
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 5,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 8,
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 5,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 9,
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 5,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 10,
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 5,
+			std::make_shared<cProtIntGenSmooth>(a_Seed + 6,
+			std::make_shared<cProtIntGenZoom  >(a_Seed + 11,
+			std::make_shared<cProtIntGenChoice>(a_Seed + 12, 2
+		))))))))))))));
+
+		auto alteration =
+			std::make_shared<cProtIntGenZoom     >(a_Seed,
+			std::make_shared<cProtIntGenLandOcean>(a_Seed, 20
+		));
+
+		auto alteration2 =
+			std::make_shared<cProtIntGenZoom     >(a_Seed + 1,
+			std::make_shared<cProtIntGenZoom     >(a_Seed + 2,
+			std::make_shared<cProtIntGenZoom     >(a_Seed + 1,
+			std::make_shared<cProtIntGenZoom     >(a_Seed + 2,
+			std::make_shared<cProtIntGenLandOcean>(a_Seed + 1, 10
+		)))));
+
+		auto FinalBiomes =
+			std::make_shared<cProtIntGenSmooth         >(a_Seed + 1,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 15,
+			std::make_shared<cProtIntGenSmooth         >(a_Seed + 1,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 16,
+			std::make_shared<cProtIntGenBeaches        >(
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 1,
+			std::make_shared<cProtIntGenAddIslands     >(a_Seed + 2004, 10,
+			std::make_shared<cProtIntGenAddToOcean     >(a_Seed + 10, 500, biDeepOcean,
+			std::make_shared<cProtIntGenReplaceRandomly>(a_Seed + 1, biPlains, biSunflowerPlains, 20,
+			std::make_shared<cProtIntGenMBiomes        >(a_Seed + 5, alteration2,
+			std::make_shared<cProtIntGenAlternateBiomes>(a_Seed + 1, alteration,
+			std::make_shared<cProtIntGenBiomeEdges     >(a_Seed + 3,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 2,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 4,
+			std::make_shared<cProtIntGenReplaceRandomly>(a_Seed + 99, biIcePlains, biIcePlainsSpikes, 50,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 8,
+			std::make_shared<cProtIntGenAddToOcean     >(a_Seed + 10, 300, biDeepOcean,
+			std::make_shared<cProtIntGenAddToOcean     >(a_Seed + 9, 8, biMushroomIsland,
+			std::make_shared<cProtIntGenBiomes         >(a_Seed + 3000,
+			std::make_shared<cProtIntGenAddIslands     >(a_Seed + 2000, 200,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 5,
+			std::make_shared<cProtIntGenRareBiomeGroups>(a_Seed + 5, 50,
+			std::make_shared<cProtIntGenBiomeGroupEdges>(
+			std::make_shared<cProtIntGenAddIslands     >(a_Seed + 2000, 200,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 7,
+			std::make_shared<cProtIntGenSetRandomly    >(a_Seed + 8, 50, bgOcean,
+			std::make_shared<cProtIntGenReplaceRandomly>(a_Seed + 101, bgIce, bgTemperate, 150,
+			std::make_shared<cProtIntGenAddIslands     >(a_Seed + 2000, 200,
+			std::make_shared<cProtIntGenSetRandomly    >(a_Seed + 9, 50, bgOcean,
+			std::make_shared<cProtIntGenZoom           >(a_Seed + 10,
+			std::make_shared<cProtIntGenLandOcean      >(a_Seed + 100, 30
+		)))))))))))))))))))))))))))))));
+
+		m_Gen =
+			std::make_shared<cProtIntGenSmooth   >(a_Seed,
+			std::make_shared<cProtIntGenZoom     >(a_Seed,
+			std::make_shared<cProtIntGenSmooth   >(a_Seed,
+			std::make_shared<cProtIntGenZoom     >(a_Seed,
+			std::make_shared<cProtIntGenMixRivers>(
+			FinalBiomes, FinalRivers
+		)))));
+	}
+
+	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_Biomes) override
+	{
+		int vals[16 * 16];
+		m_Gen->GetInts(a_ChunkX * cChunkDef::Width, a_ChunkZ * cChunkDef::Width, 16, 16, vals);
+		for (int z = 0; z < cChunkDef::Width; z++)
+		{
+			for (int x = 0; x < cChunkDef::Width; x++)
+			{
+				cChunkDef::SetBiome(a_Biomes, x, z, (EMCSBiome)vals[x + cChunkDef::Width * z]);
+			}
+		}
+	}
+
+protected:
+	std::shared_ptr<cProtIntGen> m_Gen;
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
 // cBiomeGen:
 
-cBiomeGen * cBiomeGen::CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a_CacheOffByDefault)
+cBiomeGenPtr cBiomeGen::CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a_CacheOffByDefault)
 {
 	AString BiomeGenName = a_IniFile.GetValueSet("Generator", "BiomeGen", "");
 	if (BiomeGenName.empty())
@@ -957,7 +1140,7 @@ cBiomeGen * cBiomeGen::CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a
 		BiomeGenName = "MultiStepMap";
 	}
 
-	cBiomeGen * res = NULL;
+	cBiomeGen * res = nullptr;
 	a_CacheOffByDefault = false;
 	if (NoCaseCompare(BiomeGenName, "constant") == 0)
 	{
@@ -981,6 +1164,14 @@ cBiomeGen * cBiomeGen::CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a
 	{
 		res = new cBioGenTwoLevel(a_Seed);
 	}
+	else if (NoCaseCompare(BiomeGenName, "grown") == 0)
+	{
+		res = new cBioGenGrown(a_Seed);
+	}
+	else if (NoCaseCompare(BiomeGenName, "grownprot") == 0)
+	{
+		res = new cBioGenProtGrown(a_Seed);
+	}
 	else
 	{
 		if (NoCaseCompare(BiomeGenName, "multistepmap") != 0)
@@ -1004,9 +1195,57 @@ cBiomeGen * cBiomeGen::CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a
 	}
 	res->InitializeBiomeGen(a_IniFile);
 
-	return res;
+	return cBiomeGenPtr(res);
 }
 
 
 
 
+
+////////////////////////////////////////////////////////////////////////////////
+// Performance tests:
+
+// Change to 1 to enable the perf test:
+#if 0
+
+class cBioGenPerfTest
+{
+public:
+	cBioGenPerfTest()
+	{
+		std::cout << "BioGen performance tests commencing, please wait..." << std::endl;
+		TestGen("MultiStepMap", std::make_unique<cBioGenMultiStepMap>(1).get());
+		TestGen("Grown",        std::make_unique<cBioGenGrown>(1).get());
+		TestGen("GrownProt",    std::make_unique<cBioGenProtGrown>(1).get());
+		std::cout << "BioGen performance tests complete." << std::endl;
+	}
+
+protected:
+	void TestGen(const AString && a_GenName, cBiomeGen * a_BioGen)
+	{
+		// Initialize the default settings for the generator:
+		cIniFile iniFile;
+		a_BioGen->InitializeBiomeGen(iniFile);
+
+		// Generate the biomes:
+		auto start = std::chrono::system_clock::now();
+		for (int z = 0; z < 100; z++)
+		{
+			for (int x = 0; x < 100; x++)
+			{
+				cChunkDef::BiomeMap biomes;
+				a_BioGen->GenBiomes(x, z, biomes);
+			}  // for x
+		}  // for z
+		auto dur = std::chrono::system_clock::now() - start;
+		double milliseconds = static_cast<double>((std::chrono::duration_cast<std::chrono::milliseconds>(dur)).count());
+
+		std::cout << a_GenName << ": " << 1000.0 * 100.0 * 100.0 / milliseconds << " chunks per second" << std::endl;
+	}
+} g_BioGenPerfTest;
+
+#endif
+
+
+
+
diff --git a/src/Generating/BioGen.h b/src/Generating/BioGen.h
index 20d199611..5fd0844d9 100644
--- a/src/Generating/BioGen.h
+++ b/src/Generating/BioGen.h
@@ -48,12 +48,12 @@ class cBioGenCache :
 	typedef cBiomeGen super;
 	
 public:
-	cBioGenCache(cBiomeGen * a_BioGenToCache, int a_CacheSize);  // Doesn't take ownership of a_BioGenToCache
-	~cBioGenCache();
+	cBioGenCache(cBiomeGenPtr a_BioGenToCache, int a_CacheSize);
+	virtual ~cBioGenCache();
 	
 protected:
 
-	cBiomeGen * m_BioGenToCache;
+	cBiomeGenPtr m_BioGenToCache;
 	
 	struct sCacheData
 	{
@@ -87,19 +87,21 @@ class cBioGenMulticache :
 	typedef cBiomeGen super;
 
 public:
-	/*
-	a_CacheSize defines the size of each singular cache
-	a_CachesLength defines how many caches are used for the multicache
-	*/
-	cBioGenMulticache(cBiomeGen * a_BioGenToCache, size_t a_CacheSize, size_t a_CachesLength);  // Doesn't take ownership of a_BioGenToCache
-	~cBioGenMulticache();
+	/* Creates a new multicache - a cache that divides the caching into several sub-caches based on the chunk coords.
+	This allows us to use shorter cache depths with faster lookups for more covered area. (#381)
+	a_SubCacheSize defines the size of each sub-cache
+	a_NumSubCaches defines how many sub-caches are used for the multicache. */
+	cBioGenMulticache(cBiomeGenPtr a_BioGenToCache, size_t a_SubCacheSize, size_t a_NumSubCaches);
 
 protected:
-	typedef std::vector<cBiomeGen *> cBiomeGens;
+	typedef std::vector<cBiomeGenPtr> cBiomeGenPtrs;
+
 
+	/** Number of sub-caches. Pulled out of m_Caches.size() for faster access. */
+	size_t m_NumSubCaches;
 
-	size_t     m_CachesLength;
-	cBiomeGens m_Caches;
+	/** Individual sub-caches. */
+	cBiomeGenPtrs m_Caches;
 
 
 	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
@@ -285,12 +287,7 @@ protected:
 	/// The Voronoi map that decides biomes inside individual biome groups
 	cVoronoiMap m_VoronoiSmall;
 	
-	/// The noise used to distort the input X coord
-	cPerlinNoise m_DistortX;
-	
-	/// The noise used to distort the inupt Z coord
-	cPerlinNoise m_DistortZ;
-	
+	// The noises used for the distortion:
 	cNoise m_Noise1;
 	cNoise m_Noise2;
 	cNoise m_Noise3;
@@ -298,6 +295,14 @@ protected:
 	cNoise m_Noise5;
 	cNoise m_Noise6;
 
+	// Frequencies and amplitudes for the distortion noises:
+	float m_FreqX1, m_AmpX1;
+	float m_FreqX2, m_AmpX2;
+	float m_FreqX3, m_AmpX3;
+	float m_FreqZ1, m_AmpZ1;
+	float m_FreqZ2, m_AmpZ2;
+	float m_FreqZ3, m_AmpZ3;
+
 
 	// cBiomeGen overrides:
 	virtual void GenBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
diff --git a/src/Generating/CMakeLists.txt b/src/Generating/CMakeLists.txt
index 33d622b42..1a26bd0d5 100644
--- a/src/Generating/CMakeLists.txt
+++ b/src/Generating/CMakeLists.txt
@@ -46,6 +46,7 @@ SET (HDRS
 	FinishGen.h
 	GridStructGen.h
 	HeiGen.h
+	IntGen.h
 	MineShafts.h
 	NetherFortGen.h
 	Noise3DGenerator.h
@@ -53,6 +54,7 @@ SET (HDRS
 	PieceGenerator.h
 	Prefab.h
 	PrefabPiecePool.h
+	ProtIntGen.h
 	RainbowRoadsGen.h
 	Ravines.h
 	RoughRavines.h
@@ -65,5 +67,5 @@ SET (HDRS
 if(NOT MSVC)
 	add_library(Generating ${SRCS} ${HDRS})
 
-	target_link_libraries(Generating OSSupport iniFile Blocks)
+	target_link_libraries(Generating OSSupport Blocks)
 endif()
diff --git a/src/Generating/ChunkDesc.cpp b/src/Generating/ChunkDesc.cpp
index c0b646fd0..020d3bd0f 100644
--- a/src/Generating/ChunkDesc.cpp
+++ b/src/Generating/ChunkDesc.cpp
@@ -269,10 +269,10 @@ void cChunkDesc::ReadBlockArea(cBlockArea & a_Dest, int a_MinRelX, int a_MaxRelX
 		LOGWARNING("%s: MaxRelX less than zero, adjusting to zero", __FUNCTION__);
 		a_MaxRelX = 0;
 	}
-	else if (a_MaxRelX >= cChunkDef::Width)
+	else if (a_MaxRelX > cChunkDef::Width)
 	{
 		LOGWARNING("%s: MaxRelX more than chunk width, adjusting to chunk width", __FUNCTION__);
-		a_MaxRelX = cChunkDef::Width - 1;
+		a_MaxRelX = cChunkDef::Width;
 	}
 
 	if (a_MinRelY < 0)
@@ -290,10 +290,10 @@ void cChunkDesc::ReadBlockArea(cBlockArea & a_Dest, int a_MinRelX, int a_MaxRelX
 		LOGWARNING("%s: MaxRelY less than zero, adjusting to zero", __FUNCTION__);
 		a_MaxRelY = 0;
 	}
-	else if (a_MaxRelY >= cChunkDef::Height)
+	else if (a_MaxRelY > cChunkDef::Height)
 	{
 		LOGWARNING("%s: MaxRelY more than chunk height, adjusting to chunk height", __FUNCTION__);
-		a_MaxRelY = cChunkDef::Height - 1;
+		a_MaxRelY = cChunkDef::Height;
 	}
 
 	if (a_MinRelZ < 0)
@@ -311,10 +311,10 @@ void cChunkDesc::ReadBlockArea(cBlockArea & a_Dest, int a_MinRelX, int a_MaxRelX
 		LOGWARNING("%s: MaxRelZ less than zero, adjusting to zero", __FUNCTION__);
 		a_MaxRelZ = 0;
 	}
-	else if (a_MaxRelZ >= cChunkDef::Width)
+	else if (a_MaxRelZ > cChunkDef::Width)
 	{
 		LOGWARNING("%s: MaxRelZ more than chunk width, adjusting to chunk width", __FUNCTION__);
-		a_MaxRelZ = cChunkDef::Width - 1;
+		a_MaxRelZ = cChunkDef::Width;
 	}
 
 	// Prepare the block area:
@@ -530,10 +530,10 @@ cBlockEntity * cChunkDesc::GetBlockEntity(int a_RelX, int a_RelY, int a_RelZ)
 	
 	// The block entity is not created yet, try to create it and add to list:
 	cBlockEntity * be = cBlockEntity::CreateByBlockType(GetBlockType(a_RelX, a_RelY, a_RelZ), GetBlockMeta(a_RelX, a_RelY, a_RelZ), AbsX, a_RelY, AbsZ);
-	if (be == NULL)
+	if (be == nullptr)
 	{
 		// No block entity for this block type
-		return NULL;
+		return nullptr;
 	}
 	m_BlockEntities.push_back(be);
 	return be;
diff --git a/src/Generating/ChunkDesc.h b/src/Generating/ChunkDesc.h
index eeea0c957..570132790 100644
--- a/src/Generating/ChunkDesc.h
+++ b/src/Generating/ChunkDesc.h
@@ -172,7 +172,7 @@ public:
 	
 	/** Returns the block entity at the specified coords.
 	If there is no block entity at those coords, tries to create one, based on the block type
-	If the blocktype doesn't support a block entity, returns NULL. */
+	If the blocktype doesn't support a block entity, returns nullptr. */
 	cBlockEntity * GetBlockEntity(int a_RelX, int a_RelY, int a_RelZ);
 	
 	/** Updates the heightmap to match the current contents.
diff --git a/src/Generating/ChunkGenerator.cpp b/src/Generating/ChunkGenerator.cpp
index d615456c1..92e1bb31d 100644
--- a/src/Generating/ChunkGenerator.cpp
+++ b/src/Generating/ChunkGenerator.cpp
@@ -2,7 +2,7 @@
 #include "Globals.h"
 
 #include "ChunkGenerator.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "ChunkDesc.h"
 #include "ComposableGenerator.h"
 #include "Noise3DGenerator.h"
@@ -28,9 +28,9 @@ const unsigned int QUEUE_SKIP_LIMIT = 500;
 cChunkGenerator::cChunkGenerator(void) :
 	super("cChunkGenerator"),
 	m_Seed(0),  // Will be overwritten by the actual generator
-	m_Generator(NULL),
-	m_PluginInterface(NULL),
-	m_ChunkSink(NULL)
+	m_Generator(nullptr),
+	m_PluginInterface(nullptr),
+	m_ChunkSink(nullptr)
 {
 }
 
@@ -80,7 +80,7 @@ bool cChunkGenerator::Start(cPluginInterface & a_PluginInterface, cChunkSink & a
 		m_Generator = new cComposableGenerator(*this);
 	}
 
-	if (m_Generator == NULL)
+	if (m_Generator == nullptr)
 	{
 		LOGERROR("Generator could not start, aborting the server");
 		return false;
@@ -103,7 +103,7 @@ void cChunkGenerator::Stop(void)
 	Wait();
 
 	delete m_Generator;
-	m_Generator = NULL;
+	m_Generator = nullptr;
 }
 
 
@@ -144,7 +144,7 @@ void cChunkGenerator::QueueGenerateChunk(int a_ChunkX, int a_ChunkZ, bool a_Forc
 
 void cChunkGenerator::GenerateBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap)
 {
-	if (m_Generator != NULL)
+	if (m_Generator != nullptr)
 	{
 		m_Generator->GenerateBiomes(a_ChunkX, a_ChunkZ, a_BiomeMap);
 	}
@@ -180,7 +180,7 @@ int cChunkGenerator::GetQueueLength(void)
 
 EMCSBiome cChunkGenerator::GetBiomeAt(int a_BlockX, int a_BlockZ)
 {
-	ASSERT(m_Generator != NULL);
+	ASSERT(m_Generator != nullptr);
 	return m_Generator->GetBiomeAt(a_BlockX, a_BlockZ);
 }
 
@@ -283,8 +283,8 @@ void cChunkGenerator::Execute(void)
 
 void cChunkGenerator::DoGenerate(int a_ChunkX, int a_ChunkZ)
 {
-	ASSERT(m_PluginInterface != NULL);
-	ASSERT(m_ChunkSink != NULL);
+	ASSERT(m_PluginInterface != nullptr);
+	ASSERT(m_ChunkSink != nullptr);
 	ASSERT(m_ChunkSink->IsChunkQueued(a_ChunkX, a_ChunkZ));
 
 	cChunkDesc ChunkDesc(a_ChunkX, a_ChunkZ);
diff --git a/src/Generating/CompoGen.cpp b/src/Generating/CompoGen.cpp
index 178673e32..29b831dfd 100644
--- a/src/Generating/CompoGen.cpp
+++ b/src/Generating/CompoGen.cpp
@@ -12,7 +12,7 @@
 #include "../BlockID.h"
 #include "../Item.h"
 #include "../LinearUpscale.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 
 
 
@@ -663,7 +663,7 @@ void cCompoGenNether::InitializeCompoGen(cIniFile & a_IniFile)
 ////////////////////////////////////////////////////////////////////////////////
 // cCompoGenCache:
 
-cCompoGenCache::cCompoGenCache(cTerrainCompositionGen & a_Underlying, int a_CacheSize) :
+cCompoGenCache::cCompoGenCache(cTerrainCompositionGenPtr a_Underlying, int a_CacheSize) :
 	m_Underlying(a_Underlying),
 	m_CacheSize(a_CacheSize),
 	m_CacheOrder(new int[a_CacheSize]),
@@ -687,9 +687,9 @@ cCompoGenCache::cCompoGenCache(cTerrainCompositionGen & a_Underlying, int a_Cach
 cCompoGenCache::~cCompoGenCache()
 {
 	delete[] m_CacheData;
-	m_CacheData = NULL;
+	m_CacheData = nullptr;
 	delete[] m_CacheOrder;
-	m_CacheOrder = NULL;
+	m_CacheOrder = nullptr;
 }
 
 
@@ -739,7 +739,7 @@ void cCompoGenCache::ComposeTerrain(cChunkDesc & a_ChunkDesc)
 	
 	// Not in the cache:
 	m_NumMisses++;
-	m_Underlying.ComposeTerrain(a_ChunkDesc);
+	m_Underlying->ComposeTerrain(a_ChunkDesc);
 	
 	// Insert it as the first item in the MRU order:
 	int Idx = m_CacheOrder[m_CacheSize - 1];
@@ -760,7 +760,7 @@ void cCompoGenCache::ComposeTerrain(cChunkDesc & a_ChunkDesc)
 
 void cCompoGenCache::InitializeCompoGen(cIniFile & a_IniFile)
 {
-	m_Underlying.InitializeCompoGen(a_IniFile);
+	m_Underlying->InitializeCompoGen(a_IniFile);
 }
 
 
diff --git a/src/Generating/CompoGen.h b/src/Generating/CompoGen.h
index 096b0fb5a..b145b6ba3 100644
--- a/src/Generating/CompoGen.h
+++ b/src/Generating/CompoGen.h
@@ -144,12 +144,12 @@ protected:
 
 
 
-/// Caches most-recently-used chunk composition of another composition generator. Caches only the types and metas
+/** Caches most-recently-used chunk composition of another composition generator. Caches only the types and metas */
 class cCompoGenCache :
 	public cTerrainCompositionGen
 {
 public:
-	cCompoGenCache(cTerrainCompositionGen & a_Underlying, int a_CacheSize);  // Doesn't take ownership of a_Underlying
+	cCompoGenCache(cTerrainCompositionGenPtr a_Underlying, int a_CacheSize);  // Doesn't take ownership of a_Underlying
 	~cCompoGenCache();
 	
 	// cTerrainCompositionGen override:
@@ -158,7 +158,7 @@ public:
 	
 protected:
 
-	cTerrainCompositionGen & m_Underlying;
+	cTerrainCompositionGenPtr m_Underlying;
 	
 	struct sCacheData
 	{
diff --git a/src/Generating/ComposableGenerator.cpp b/src/Generating/ComposableGenerator.cpp
index 69068d231..5f46574c7 100644
--- a/src/Generating/ComposableGenerator.cpp
+++ b/src/Generating/ComposableGenerator.cpp
@@ -7,7 +7,7 @@
 
 #include "ComposableGenerator.h"
 #include "../World.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "../Root.h"
 
 // Individual composed algorithms:
@@ -39,7 +39,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 // cTerrainCompositionGen:
 
-cTerrainCompositionGen * cTerrainCompositionGen::CreateCompositionGen(cIniFile & a_IniFile, cBiomeGen & a_BiomeGen, cTerrainHeightGen & a_HeightGen, int a_Seed)
+cTerrainCompositionGenPtr cTerrainCompositionGen::CreateCompositionGen(cIniFile & a_IniFile, cBiomeGenPtr a_BiomeGen, cTerrainHeightGen & a_HeightGen, int a_Seed)
 {
 	AString CompoGenName = a_IniFile.GetValueSet("Generator", "CompositionGen", "");
 	if (CompoGenName.empty())
@@ -48,7 +48,7 @@ cTerrainCompositionGen * cTerrainCompositionGen::CreateCompositionGen(cIniFile &
 		CompoGenName = "Biomal";
 	}
 	
-	cTerrainCompositionGen * res = NULL;
+	cTerrainCompositionGen * res = nullptr;
 	if (NoCaseCompare(CompoGenName, "sameblock") == 0)
 	{
 		res = new cCompoGenSameBlock;
@@ -73,6 +73,10 @@ cTerrainCompositionGen * cTerrainCompositionGen::CreateCompositionGen(cIniFile &
 	{
 		res = new cCompoGenNether(a_Seed);
 	}
+	else if (NoCaseCompare(CompoGenName, "BiomalNoise3D") == 0)
+	{
+		res = new cBiomalNoise3DComposable(a_Seed, a_BiomeGen);
+	}
 	else if (NoCaseCompare(CompoGenName, "Noise3D") == 0)
 	{
 		res = new cNoise3DComposable(a_Seed);
@@ -102,12 +106,12 @@ cTerrainCompositionGen * cTerrainCompositionGen::CreateCompositionGen(cIniFile &
 		a_IniFile.SetValue("Generator", "CompositionGen", "Biomal");
 		return CreateCompositionGen(a_IniFile, a_BiomeGen, a_HeightGen, a_Seed);
 	}
-	ASSERT(res != NULL);
+	ASSERT(res != nullptr);
 	
 	// Read the settings from the ini file:
 	res->InitializeCompoGen(a_IniFile);
 	
-	return res;
+	return cTerrainCompositionGenPtr(res);
 }
 
 
@@ -119,12 +123,9 @@ cTerrainCompositionGen * cTerrainCompositionGen::CreateCompositionGen(cIniFile &
 
 cComposableGenerator::cComposableGenerator(cChunkGenerator & a_ChunkGenerator) :
 	super(a_ChunkGenerator),
-	m_BiomeGen(NULL),
-	m_HeightGen(NULL),
-	m_CompositionGen(NULL),
-	m_UnderlyingBiomeGen(NULL),
-	m_UnderlyingHeightGen(NULL),
-	m_UnderlyingCompositionGen(NULL)
+	m_BiomeGen(),
+	m_HeightGen(),
+	m_CompositionGen()
 {
 }
 
@@ -132,33 +133,6 @@ cComposableGenerator::cComposableGenerator(cChunkGenerator & a_ChunkGenerator) :
 
 
 
-cComposableGenerator::~cComposableGenerator()
-{
-	// Delete the generating composition:
-	for (cFinishGenList::const_iterator itr = m_FinishGens.begin(); itr != m_FinishGens.end(); ++itr)
-	{
-		delete *itr;
-	}
-	m_FinishGens.clear();
-
-	delete m_CompositionGen;
-	m_CompositionGen = NULL;
-	delete m_HeightGen;
-	m_HeightGen = NULL;
-	delete m_BiomeGen;
-	m_BiomeGen = NULL;
-	delete m_UnderlyingCompositionGen;
-	m_UnderlyingCompositionGen = NULL;
-	delete m_UnderlyingHeightGen;
-	m_UnderlyingHeightGen = NULL;
-	delete m_UnderlyingBiomeGen;
-	m_UnderlyingBiomeGen = NULL;
-}
-
-
-
-
-
 void cComposableGenerator::Initialize(cIniFile & a_IniFile)
 {
 	super::Initialize(a_IniFile);
@@ -175,7 +149,7 @@ void cComposableGenerator::Initialize(cIniFile & a_IniFile)
 
 void cComposableGenerator::GenerateBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap)
 {
-	if (m_BiomeGen != NULL)  // Quick fix for generator deinitializing before the world storage finishes loading
+	if (m_BiomeGen != nullptr)  // Quick fix for generator deinitializing before the world storage finishes loading
 	{
 		m_BiomeGen->GenBiomes(a_ChunkX, a_ChunkZ, a_BiomeMap);
 	}
@@ -245,15 +219,14 @@ void cComposableGenerator::InitBiomeGen(cIniFile & a_IniFile)
 		CacheSize = 4;
 	}
 	LOGD("Using a cache for biomegen of size %d.", CacheSize);
-	m_UnderlyingBiomeGen = m_BiomeGen;
 	if (MultiCacheLength > 0)
 	{
 		LOGD("Enabling multicache for biomegen of length %d.", MultiCacheLength);
-		m_BiomeGen = new cBioGenMulticache(m_UnderlyingBiomeGen, CacheSize, MultiCacheLength);
+		m_BiomeGen = cBiomeGenPtr(new cBioGenMulticache(m_BiomeGen, CacheSize, MultiCacheLength));
 	}
 	else
 	{
-		m_BiomeGen = new cBioGenCache(m_UnderlyingBiomeGen, CacheSize);
+		m_BiomeGen = cBiomeGenPtr(new cBioGenCache(m_BiomeGen, CacheSize));
 	}
 }
 
@@ -264,7 +237,7 @@ void cComposableGenerator::InitBiomeGen(cIniFile & a_IniFile)
 void cComposableGenerator::InitHeightGen(cIniFile & a_IniFile)
 {
 	bool CacheOffByDefault = false;
-	m_HeightGen = cTerrainHeightGen::CreateHeightGen(a_IniFile, *m_BiomeGen, m_ChunkGenerator.GetSeed(), CacheOffByDefault);
+	m_HeightGen = cTerrainHeightGen::CreateHeightGen(a_IniFile, m_BiomeGen, m_ChunkGenerator.GetSeed(), CacheOffByDefault);
 	
 	// Add a cache, if requested:
 	int CacheSize = a_IniFile.GetValueSetI("Generator", "HeightGenCacheSize", CacheOffByDefault ? 0 : 64);
@@ -278,8 +251,7 @@ void cComposableGenerator::InitHeightGen(cIniFile & a_IniFile)
 			CacheSize = 4;
 		}
 		LOGD("Using a cache for Heightgen of size %d.", CacheSize);
-		m_UnderlyingHeightGen = m_HeightGen;
-		m_HeightGen = new cHeiGenCache(*m_UnderlyingHeightGen, CacheSize);
+		m_HeightGen = cTerrainHeightGenPtr(new cHeiGenCache(m_HeightGen, CacheSize));
 	}
 }
 
@@ -289,13 +261,12 @@ void cComposableGenerator::InitHeightGen(cIniFile & a_IniFile)
 
 void cComposableGenerator::InitCompositionGen(cIniFile & a_IniFile)
 {
-	m_CompositionGen = cTerrainCompositionGen::CreateCompositionGen(a_IniFile, *m_BiomeGen, *m_HeightGen, m_ChunkGenerator.GetSeed());
+	m_CompositionGen = cTerrainCompositionGen::CreateCompositionGen(a_IniFile, m_BiomeGen, *m_HeightGen, m_ChunkGenerator.GetSeed());
 	
 	int CompoGenCacheSize = a_IniFile.GetValueSetI("Generator", "CompositionGenCacheSize", 64);
 	if (CompoGenCacheSize > 1)
 	{
-		m_UnderlyingCompositionGen = m_CompositionGen;
-		m_CompositionGen = new cCompoGenCache(*m_UnderlyingCompositionGen, 32);
+		m_CompositionGen = cTerrainCompositionGenPtr(new cCompoGenCache(m_CompositionGen, 32));
 	}
 }
 
@@ -319,7 +290,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 		{
 			int DefaultBottomLavaLevel = (Dimension == dimNether) ? 30 : 10;
 			int BottomLavaLevel = a_IniFile.GetValueSetI("Generator", "BottomLavaLevel", DefaultBottomLavaLevel);
-			m_FinishGens.push_back(new cFinishGenBottomLava(BottomLavaLevel));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenBottomLava(BottomLavaLevel)));
 		}
 		else if (NoCaseCompare(*itr, "DeadBushes") == 0)
 		{
@@ -341,20 +312,20 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			AllowedBlocks.push_back(E_BLOCK_HARDENED_CLAY);
 			AllowedBlocks.push_back(E_BLOCK_STAINED_CLAY);
 
-			m_FinishGens.push_back(new cFinishGenSingleTopBlock(Seed, E_BLOCK_DEAD_BUSH, AllowedBiomes, 2, AllowedBlocks));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenSingleTopBlock(Seed, E_BLOCK_DEAD_BUSH, AllowedBiomes, 2, AllowedBlocks)));
 		}
 		else if (NoCaseCompare(*itr, "DirectOverhangs") == 0)
 		{
-			m_FinishGens.push_back(new cStructGenDirectOverhangs(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenDirectOverhangs(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "DistortedMembraneOverhangs") == 0)
 		{
-			m_FinishGens.push_back(new cStructGenDistortedMembraneOverhangs(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenDistortedMembraneOverhangs(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "DualRidgeCaves") == 0)
 		{
 			float Threshold = (float)a_IniFile.GetValueSetF("Generator", "DualRidgeCavesThreshold", 0.3);
-			m_FinishGens.push_back(new cStructGenDualRidgeCaves(Seed, Threshold));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenDualRidgeCaves(Seed, Threshold)));
 		}
 		else if (NoCaseCompare(*itr, "DungeonRooms") == 0)
 		{
@@ -362,24 +333,24 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			int     MaxSize       = a_IniFile.GetValueSetI("Generator", "DungeonRoomsMaxSize", 7);
 			int     MinSize       = a_IniFile.GetValueSetI("Generator", "DungeonRoomsMinSize", 5);
 			AString HeightDistrib = a_IniFile.GetValueSet ("Generator", "DungeonRoomsHeightDistrib", "0, 0; 10, 10; 11, 500; 40, 500; 60, 40; 90, 1");
-			m_FinishGens.push_back(new cDungeonRoomsFinisher(*m_HeightGen, Seed, GridSize, MaxSize, MinSize, HeightDistrib));
+			m_FinishGens.push_back(cFinishGenPtr(new cDungeonRoomsFinisher(m_HeightGen, Seed, GridSize, MaxSize, MinSize, HeightDistrib)));
 		}
 		else if (NoCaseCompare(*itr, "Ice") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenIce);
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenIce));
 		}
 		else if (NoCaseCompare(*itr, "LavaLakes") == 0)
 		{
 			int Probability = a_IniFile.GetValueSetI("Generator", "LavaLakesProbability", 10);
-			m_FinishGens.push_back(new cStructGenLakes(Seed * 5 + 16873, E_BLOCK_STATIONARY_LAVA, *m_HeightGen, Probability));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenLakes(Seed * 5 + 16873, E_BLOCK_STATIONARY_LAVA, m_HeightGen, Probability)));
 		}
 		else if (NoCaseCompare(*itr, "LavaSprings") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenFluidSprings(Seed, E_BLOCK_LAVA, a_IniFile, Dimension));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenFluidSprings(Seed, E_BLOCK_LAVA, a_IniFile, Dimension)));
 		}
 		else if (NoCaseCompare(*itr, "MarbleCaves") == 0)
 		{
-			m_FinishGens.push_back(new cStructGenMarbleCaves(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenMarbleCaves(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "MineShafts") == 0)
 		{
@@ -389,10 +360,10 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			int ChanceCorridor  = a_IniFile.GetValueSetI("Generator", "MineShaftsChanceCorridor",  600);
 			int ChanceCrossing  = a_IniFile.GetValueSetI("Generator", "MineShaftsChanceCrossing",  200);
 			int ChanceStaircase = a_IniFile.GetValueSetI("Generator", "MineShaftsChanceStaircase", 200);
-			m_FinishGens.push_back(new cStructGenMineShafts(
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenMineShafts(
 				Seed, GridSize, MaxOffset, MaxSystemSize,
 				ChanceCorridor, ChanceCrossing, ChanceStaircase
-			));
+			)));
 		}
 		else if (NoCaseCompare(*itr, "Lilypads") == 0)
 		{
@@ -406,7 +377,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			AllowedBlocks.push_back(E_BLOCK_WATER);
 			AllowedBlocks.push_back(E_BLOCK_STATIONARY_WATER);
 
-			m_FinishGens.push_back(new cFinishGenSingleTopBlock(Seed, E_BLOCK_LILY_PAD, AllowedBiomes, 4, AllowedBlocks));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenSingleTopBlock(Seed, E_BLOCK_LILY_PAD, AllowedBiomes, 4, AllowedBlocks)));
 		}
 		else if (NoCaseCompare(*itr, "NaturalPatches") == 0)
 		{
@@ -422,24 +393,51 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 
 			// Gravel vein
 			cStructGenOreNests::OreInfo GravelVein;
-			GravelVein.BlockType = E_BLOCK_DIRT;
+			GravelVein.BlockType = E_BLOCK_GRAVEL;
 			GravelVein.MaxHeight = 127;
 			GravelVein.NumNests = 20;
 			GravelVein.NestSize = 32;
 			Ores.push_back(GravelVein);
 
-			m_FinishGens.push_back(new cStructGenOreNests(Seed, Ores, E_BLOCK_STONE));
+			// Granite vein
+			cStructGenOreNests::OreInfo GraniteVein;
+			GraniteVein.BlockType = E_BLOCK_STONE;
+			GraniteVein.BlockMeta = 1;
+			GraniteVein.MaxHeight = 127;
+			GraniteVein.NumNests = 20;
+			GraniteVein.NestSize = 32;
+			Ores.push_back(GraniteVein);
+
+			// Diorite vein
+			cStructGenOreNests::OreInfo DioriteVein;
+			DioriteVein.BlockType = E_BLOCK_STONE;
+			DioriteVein.BlockMeta = 3;
+			DioriteVein.MaxHeight = 127;
+			DioriteVein.NumNests = 20;
+			DioriteVein.NestSize = 32;
+			Ores.push_back(DioriteVein);
+
+			// Andesite vein
+			cStructGenOreNests::OreInfo AndesiteVein;
+			AndesiteVein.BlockType = E_BLOCK_STONE;
+			AndesiteVein.BlockMeta = 5;
+			AndesiteVein.MaxHeight = 127;
+			AndesiteVein.NumNests = 20;
+			AndesiteVein.NestSize = 32;
+			Ores.push_back(AndesiteVein);
+
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenOreNests(Seed, Ores, E_BLOCK_STONE)));
 		}
 		else if (NoCaseCompare(*itr, "NetherClumpFoliage") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenNetherClumpFoliage(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenNetherClumpFoliage(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "NetherForts") == 0)
 		{
 			int GridSize  = a_IniFile.GetValueSetI("Generator", "NetherFortsGridSize", 512);
 			int MaxOffset = a_IniFile.GetValueSetI("Generator", "NetherFortMaxOffset", 128);
 			int MaxDepth  = a_IniFile.GetValueSetI("Generator", "NetherFortsMaxDepth", 12);
-			m_FinishGens.push_back(new cNetherFortGen(Seed, GridSize, MaxOffset, MaxDepth));
+			m_FinishGens.push_back(cFinishGenPtr(new cNetherFortGen(Seed, GridSize, MaxOffset, MaxDepth)));
 		}
 		else if (NoCaseCompare(*itr, "NetherOreNests") == 0)
 		{
@@ -453,7 +451,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			QuartzVein.NestSize = 8;
 			Ores.push_back(QuartzVein);
 
-			m_FinishGens.push_back(new cStructGenOreNests(Seed, Ores, E_BLOCK_NETHERRACK));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenOreNests(Seed, Ores, E_BLOCK_NETHERRACK)));
 
 		}
 		else if (NoCaseCompare(*itr, "OreNests") == 0)
@@ -508,11 +506,11 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			DiamondVein.NestSize = 4;
 			Ores.push_back(DiamondVein);
 
-			m_FinishGens.push_back(new cStructGenOreNests(Seed, Ores, E_BLOCK_STONE));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenOreNests(Seed, Ores, E_BLOCK_STONE)));
 		}
 		else if (NoCaseCompare(*itr, "POCPieces") == 0)
 		{
-			m_FinishGens.push_back(new cPOCPieceGenerator(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cPOCPieceGenerator(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "PreSimulator") == 0)
 		{
@@ -521,7 +519,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			bool PreSimulateWater         = a_IniFile.GetValueSetB("Generator", "PreSimulatorWater", true);
 			bool PreSimulateLava          = a_IniFile.GetValueSetB("Generator", "PreSimulatorLava", true);
 
-			m_FinishGens.push_back(new cFinishGenPreSimulator(PreSimulateFallingBlocks, PreSimulateWater, PreSimulateLava));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenPreSimulator(PreSimulateFallingBlocks, PreSimulateWater, PreSimulateLava)));
 		}
 		else if (NoCaseCompare(*itr, "RainbowRoads") == 0)
 		{
@@ -529,11 +527,11 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			int MaxOffset = a_IniFile.GetValueSetI("Generator", "RainbowRoadsMaxOffset", 128);
 			int MaxDepth  = a_IniFile.GetValueSetI("Generator", "RainbowRoadsMaxDepth",   30);
 			int MaxSize   = a_IniFile.GetValueSetI("Generator", "RainbowRoadsMaxSize",   260);
-			m_FinishGens.push_back(new cRainbowRoadsGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize));
+			m_FinishGens.push_back(cFinishGenPtr(new cRainbowRoadsGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize)));
 		}
 		else if (NoCaseCompare(*itr, "Ravines") == 0)
 		{
-			m_FinishGens.push_back(new cStructGenRavines(Seed, 128));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenRavines(Seed, 128)));
 		}
 		else if (NoCaseCompare(*itr, "RoughRavines") == 0)
 		{
@@ -553,7 +551,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			double MinCeilingHeightEdge   = a_IniFile.GetValueSetF("Generator", "RoughRavinesMinCeilingHeightEdge",   38);
 			double MaxCeilingHeightCenter = a_IniFile.GetValueSetF("Generator", "RoughRavinesMaxCeilingHeightCenter", 58);
 			double MinCeilingHeightCenter = a_IniFile.GetValueSetF("Generator", "RoughRavinesMinCeilingHeightCenter", 36);
-			m_FinishGens.push_back(new cRoughRavines(
+			m_FinishGens.push_back(cFinishGenPtr(new cRoughRavines(
 				Seed, MaxSize, MinSize,
 				(float)MaxCenterWidth,         (float)MinCenterWidth,
 				(float)MaxRoughness,           (float)MinRoughness,
@@ -562,27 +560,27 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 				(float)MaxCeilingHeightEdge,   (float)MinCeilingHeightEdge,
 				(float)MaxCeilingHeightCenter, (float)MinCeilingHeightCenter,
 				GridSize, MaxOffset
-			));
+			)));
 		}
 		else if (NoCaseCompare(*itr, "Snow") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenSnow);
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenSnow));
 		}
 		else if (NoCaseCompare(*itr, "SprinkleFoliage") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenSprinkleFoliage(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenSprinkleFoliage(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "TallGrass") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenTallGrass(Seed));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenTallGrass(Seed)));
 		}
 		else if (NoCaseCompare(*itr, "TestRails") == 0)
 		{
-			m_FinishGens.push_back(new cTestRailsGen(Seed, 100, 1, 7, 50));
+			m_FinishGens.push_back(cFinishGenPtr(new cTestRailsGen(Seed, 100, 1, 7, 50)));
 		}
 		else if (NoCaseCompare(*itr, "Trees") == 0)
 		{
-			m_FinishGens.push_back(new cStructGenTrees(Seed, m_BiomeGen, m_HeightGen, m_CompositionGen));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenTrees(Seed, m_BiomeGen, m_HeightGen, m_CompositionGen)));
 		}
 		else if (NoCaseCompare(*itr, "UnderwaterBases") == 0)
 		{
@@ -590,7 +588,7 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			int MaxOffset = a_IniFile.GetValueSetI("Generator", "UnderwaterBaseMaxOffset", 128);
 			int MaxDepth  = a_IniFile.GetValueSetI("Generator", "UnderwaterBaseMaxDepth",    7);
 			int MaxSize   = a_IniFile.GetValueSetI("Generator", "UnderwaterBaseMaxSize",   128);
-			m_FinishGens.push_back(new cUnderwaterBaseGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize, *m_BiomeGen));
+			m_FinishGens.push_back(cFinishGenPtr(new cUnderwaterBaseGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize, m_BiomeGen)));
 		}
 		else if (NoCaseCompare(*itr, "Villages") == 0)
 		{
@@ -600,23 +598,23 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			int MaxSize    = a_IniFile.GetValueSetI("Generator", "VillageMaxSize",   128);
 			int MinDensity = a_IniFile.GetValueSetI("Generator", "VillageMinDensity", 50);
 			int MaxDensity = a_IniFile.GetValueSetI("Generator", "VillageMaxDensity", 80);
-			m_FinishGens.push_back(new cVillageGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize, MinDensity, MaxDensity, *m_BiomeGen, *m_HeightGen));
+			m_FinishGens.push_back(cFinishGenPtr(new cVillageGen(Seed, GridSize, MaxOffset, MaxDepth, MaxSize, MinDensity, MaxDensity, m_BiomeGen, m_HeightGen)));
 		}
 		else if (NoCaseCompare(*itr, "WaterLakes") == 0)
 		{
 			int Probability = a_IniFile.GetValueSetI("Generator", "WaterLakesProbability", 25);
-			m_FinishGens.push_back(new cStructGenLakes(Seed * 3 + 652, E_BLOCK_STATIONARY_WATER, *m_HeightGen, Probability));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenLakes(Seed * 3 + 652, E_BLOCK_STATIONARY_WATER, m_HeightGen, Probability)));
 		}
 		else if (NoCaseCompare(*itr, "WaterSprings") == 0)
 		{
-			m_FinishGens.push_back(new cFinishGenFluidSprings(Seed, E_BLOCK_WATER, a_IniFile, Dimension));
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenFluidSprings(Seed, E_BLOCK_WATER, a_IniFile, Dimension)));
 		}
 		else if (NoCaseCompare(*itr, "WormNestCaves") == 0)
 		{
 			int Size      = a_IniFile.GetValueSetI("Generator", "WormNestCavesSize", 64);
 			int Grid      = a_IniFile.GetValueSetI("Generator", "WormNestCavesGrid", 96);
 			int MaxOffset = a_IniFile.GetValueSetI("Generator", "WormNestMaxOffset", 32);
-			m_FinishGens.push_back(new cStructGenWormNestCaves(Seed, Size, Grid, MaxOffset));
+			m_FinishGens.push_back(cFinishGenPtr(new cStructGenWormNestCaves(Seed, Size, Grid, MaxOffset)));
 		}
 		else
 		{
diff --git a/src/Generating/ComposableGenerator.h b/src/Generating/ComposableGenerator.h
index 6b7627d2e..a091f8d53 100644
--- a/src/Generating/ComposableGenerator.h
+++ b/src/Generating/ComposableGenerator.h
@@ -24,6 +24,16 @@ See http://forum.mc-server.org/showthread.php?tid=409 for details.
 
 
 
+// Forward-declare the shared pointers to subgenerator classes:
+class cBiomeGen;
+class cTerrainHeightGen;
+class cTerrainCompositionGen;
+class cFinishGen;
+typedef SharedPtr<cBiomeGen>              cBiomeGenPtr;
+typedef SharedPtr<cTerrainHeightGen>      cTerrainHeightGenPtr;
+typedef SharedPtr<cTerrainCompositionGen> cTerrainCompositionGenPtr;
+typedef SharedPtr<cFinishGen>             cFinishGenPtr;
+
 // fwd: Noise3DGenerator.h
 class cNoise3DComposable;
 
@@ -53,8 +63,7 @@ public:
 	a_CacheOffByDefault gets set to whether the cache should be disabled by default.
 	Used in BiomeVisualiser, too.
 	Implemented in BioGen.cpp! */
-	static cBiomeGen * CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a_CacheOffByDefault);
-
+	static cBiomeGenPtr CreateBiomeGen(cIniFile & a_IniFile, int a_Seed, bool & a_CacheOffByDefault);
 } ;
 
 
@@ -83,7 +92,7 @@ public:
 	a_CacheOffByDefault gets set to whether the cache should be disabled by default
 	Implemented in HeiGen.cpp!
 	*/
-	static cTerrainHeightGen * CreateHeightGen(cIniFile & a_IniFile, cBiomeGen & a_BiomeGen, int a_Seed, bool & a_CacheOffByDefault);
+	static cTerrainHeightGenPtr CreateHeightGen(cIniFile & a_IniFile, cBiomeGenPtr a_BiomeGen, int a_Seed, bool & a_CacheOffByDefault);
 } ;
 
 
@@ -109,7 +118,7 @@ public:
 	a_BiomeGen is the underlying biome generator, some composition generators may depend on it to generate more biomes
 	a_HeightGen is the underlying height generator, some composition generators may depend on it providing additional values
 	*/
-	static cTerrainCompositionGen * CreateCompositionGen(cIniFile & a_IniFile, cBiomeGen & a_BiomeGen, cTerrainHeightGen & a_HeightGen, int a_Seed);
+	static cTerrainCompositionGenPtr CreateCompositionGen(cIniFile & a_IniFile, cBiomeGenPtr a_BiomeGen, cTerrainHeightGen & a_HeightGen, int a_Seed);
 } ;
 
 
@@ -131,7 +140,7 @@ public:
 	virtual void GenFinish(cChunkDesc & a_ChunkDesc) = 0;
 } ;
 
-typedef std::list<cFinishGen *> cFinishGenList;
+typedef std::list<cFinishGenPtr> cFinishGenList;
 
 
 
@@ -144,7 +153,6 @@ class cComposableGenerator :
 	
 public:
 	cComposableGenerator(cChunkGenerator & a_ChunkGenerator);
-	virtual ~cComposableGenerator();
 	
 	virtual void Initialize(cIniFile & a_IniFile) override;
 	virtual void GenerateBiomes(int a_ChunkX, int a_ChunkZ, cChunkDef::BiomeMap & a_BiomeMap) override;
@@ -152,15 +160,10 @@ public:
 
 protected:
 	// The generation composition:
-	cBiomeGen *              m_BiomeGen;
-	cTerrainHeightGen *      m_HeightGen;
-	cTerrainCompositionGen * m_CompositionGen;
-	cFinishGenList           m_FinishGens;
-	
-	// Generators underlying the caches:
-	cBiomeGen *              m_UnderlyingBiomeGen;
-	cTerrainHeightGen *      m_UnderlyingHeightGen;
-	cTerrainCompositionGen * m_UnderlyingCompositionGen;
+	cBiomeGenPtr              m_BiomeGen;
+	cTerrainHeightGenPtr      m_HeightGen;
+	cTerrainCompositionGenPtr m_CompositionGen;
+	cFinishGenList            m_FinishGens;
 	
 	
 	/** Reads the biome gen settings from the ini and initializes m_BiomeGen accordingly */
diff --git a/src/Generating/DistortedHeightmap.cpp b/src/Generating/DistortedHeightmap.cpp
index c18c402da..d5bc6ab55 100644
--- a/src/Generating/DistortedHeightmap.cpp
+++ b/src/Generating/DistortedHeightmap.cpp
@@ -7,7 +7,7 @@
 
 #include "DistortedHeightmap.h"
 #include "../OSSupport/File.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "../LinearUpscale.h"
 
 
@@ -227,15 +227,15 @@ const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[256] =
 	/* biMesaPlateau      */ { 2.0f,  2.0f},  // 39
 	
 	// biomes 40 .. 128 are unused, 89 empty placeholders here:
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 40 .. 49
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 50 .. 59
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 60 .. 69
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 70 .. 79
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 80 .. 89
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 90 .. 99
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 100 .. 109
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 110 .. 119
-	{}, {}, {}, {}, {}, {}, {}, {}, {},      // 120 .. 128
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 40 .. 49
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 50 .. 59
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 60 .. 69
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 70 .. 79
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 80 .. 89
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 90 .. 99
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 100 .. 109
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 110 .. 119
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},                // 120 .. 128
 	
 	// Release 1.7 /* biome variants:
 	/* biSunflowerPlains      */ { 1.0f,  1.0f},  // 129
@@ -246,22 +246,22 @@ const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[256] =
 	/* biSwamplandM           */ { 0.0f,  0.0f},  // 134
 	
 	// Biomes 135 .. 139 unused, 5 empty placeholders here:
-	{}, {}, {}, {}, {},                           // 135 .. 139
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 135 .. 139
 
 	/* biIcePlainsSpikes      */ { 1.0f,  1.0f},  // 140
 	
 	// Biomes 141 .. 148 unused, 8 empty placeholders here:
-	{}, {}, {}, {}, {}, {}, {}, {},               // 141 .. 148
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},  // 141 .. 148
 
 	/* biJungleM              */ { 4.0f,  4.0f},  // 149
-	{},                                           // 150
+	{0.0f, 0.0f},                                 // 150
 	/* biJungleEdgeM          */ { 3.0f,  3.0f},  // 151
-	{}, {}, {},                                   // 152 .. 154
+	{0.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, 0.0f},     // 152 .. 154
 	/* biBirchForestM         */ { 3.0f,  3.0f},  // 155
 	/* biBirchForestHillsM    */ { 5.0f,  5.0f},  // 156
 	/* biRoofedForestM        */ { 2.0f,  2.0f},  // 157
 	/* biColdTaigaM           */ { 1.0f,  1.0f},  // 158
-	{},                                           // 159
+	{0.0f, 0.0f},                                 // 159
 	/* biMegaSpruceTaiga      */ { 3.0f,  3.0f},  // 160
 	/* biMegaSpruceTaigaHills */ { 3.0f,  3.0f},  // 161
 	/* biExtremeHillsPlusM    */ {32.0f, 32.0f},  // 162
@@ -276,13 +276,13 @@ const cDistortedHeightmap::sGenParam cDistortedHeightmap::m_GenParam[256] =
 
 
 
-cDistortedHeightmap::cDistortedHeightmap(int a_Seed, cBiomeGen & a_BiomeGen) :
+cDistortedHeightmap::cDistortedHeightmap(int a_Seed, cBiomeGenPtr a_BiomeGen) :
 	m_NoiseDistortX(a_Seed + 1000),
 	m_NoiseDistortZ(a_Seed + 2000),
 	m_OceanFloorSelect(a_Seed + 3000),
 	m_MesaFloor(a_Seed + 4000),
 	m_BiomeGen(a_BiomeGen),
-	m_UnderlyingHeiGen(a_Seed, a_BiomeGen),
+	m_UnderlyingHeiGen(new cHeiGenBiomal(a_Seed, a_BiomeGen)),
 	m_HeightGen(m_UnderlyingHeiGen, 64),
 	m_IsInitialized(false)
 {
@@ -540,10 +540,11 @@ void cDistortedHeightmap::InitializeCompoGen(cIniFile & a_IniFile)
 
 int cDistortedHeightmap::GetHeightmapAt(NOISE_DATATYPE a_X, NOISE_DATATYPE a_Z)
 {
-	int ChunkX = (int)floor(a_X / (NOISE_DATATYPE)16);
-	int ChunkZ = (int)floor(a_Z / (NOISE_DATATYPE)16);
-	int RelX = (int)(a_X - (NOISE_DATATYPE)ChunkX * cChunkDef::Width);
-	int RelZ = (int)(a_Z - (NOISE_DATATYPE)ChunkZ * cChunkDef::Width);
+	int RelX = (int)std::floor(a_X);
+	int RelY = 0;
+	int RelZ = (int)std::floor(a_Z);
+	int ChunkX, ChunkZ;
+	cChunkDef::AbsoluteToRelative(RelX, RelY, RelZ, ChunkX, ChunkZ);
 
 	// If we're withing the same chunk, return the pre-cached heightmap:
 	if ((ChunkX == m_CurChunkX) && (ChunkZ == m_CurChunkZ))
@@ -576,7 +577,7 @@ void cDistortedHeightmap::UpdateDistortAmps(void)
 	{
 		for (int x = -1; x <= 1; x++)
 		{
-			m_BiomeGen.GenBiomes(m_CurChunkX + x, m_CurChunkZ + z, Biomes[x + 1][z + 1]);
+			m_BiomeGen->GenBiomes(m_CurChunkX + x, m_CurChunkZ + z, Biomes[x + 1][z + 1]);
 		}  // for x
 	}  // for z
 
diff --git a/src/Generating/DistortedHeightmap.h b/src/Generating/DistortedHeightmap.h
index e6b3c9d3f..d073f29e4 100644
--- a/src/Generating/DistortedHeightmap.h
+++ b/src/Generating/DistortedHeightmap.h
@@ -35,7 +35,7 @@ public:
 		NIBBLETYPE BlockMeta;
 	} ;
 
-	cDistortedHeightmap(int a_Seed, cBiomeGen & a_BiomeGen);
+	cDistortedHeightmap(int a_Seed, cBiomeGenPtr a_BiomeGen);
 	
 protected:
 	typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
@@ -64,9 +64,14 @@ protected:
 	int m_CurChunkZ;
 	NOISE_DATATYPE m_DistortedHeightmap[17 * 257 * 17];
 
-	cBiomeGen &   m_BiomeGen;
-	cHeiGenBiomal m_UnderlyingHeiGen;  // This generator provides us with base heightmap (before distortion)
-	cHeiGenCache  m_HeightGen;         // Cache above m_UnderlyingHeiGen
+	/** The bime generator to query for biomes. */
+	cBiomeGenPtr m_BiomeGen;
+
+	/** The generator that provides the base heightmap (before distortion). */
+	cTerrainHeightGenPtr m_UnderlyingHeiGen;
+
+	/** Cache for m_UnderlyingHeiGen. */
+	cHeiGenCache  m_HeightGen;
 	
 	/// Heightmap for the current chunk, before distortion (from m_HeightGen). Used for optimization.
 	cChunkDef::HeightMap m_CurChunkHeights;
diff --git a/src/Generating/DungeonRoomsFinisher.cpp b/src/Generating/DungeonRoomsFinisher.cpp
index f213455d6..3f328868d 100644
--- a/src/Generating/DungeonRoomsFinisher.cpp
+++ b/src/Generating/DungeonRoomsFinisher.cpp
@@ -6,6 +6,7 @@
 #include "Globals.h"
 #include "DungeonRoomsFinisher.h"
 #include "../FastRandom.h"
+#include "../BlockEntities/ChestEntity.h"
 
 
 
@@ -175,7 +176,33 @@ protected:
 		}
 		a_ChunkDesc.SetBlockTypeMeta(RelX, m_FloorHeight + 1, RelZ, E_BLOCK_CHEST, (NIBBLETYPE)a_Chest.y);
 
-		// TODO: Fill the chest with random loot
+		// Fill the chest with random loot
+		static const cLootProbab LootProbab[] =
+		{
+			// Item,                          MinAmount, MaxAmount, Weight
+			{ cItem(E_ITEM_GOLDEN_APPLE),        1,         1,         1 },
+			{ cItem(E_ITEM_DIAMOND_HORSE_ARMOR), 1,         1,         1 },
+			{ cItem(E_ITEM_GOLD_HORSE_ARMOR),    1,         1,         2 },
+			{ cItem(E_ITEM_13_DISC),             1,         1,         4 },
+			{ cItem(E_ITEM_CAT_DISC),            1,         1,         4 },
+			{ cItem(E_ITEM_IRON_HORSE_ARMOR),    1,         1,         5 },
+			{ cItem(E_ITEM_IRON),                1,         4,        10 },
+			{ cItem(E_ITEM_WHEAT),               1,         4,        10 },
+			{ cItem(E_ITEM_GUNPOWDER),           1,         4,        10 },
+			{ cItem(E_ITEM_STRING),              1,         4,        10 },
+			{ cItem(E_ITEM_REDSTONE_DUST),       1,         4,        10 },
+			{ cItem(E_ITEM_SADDLE),              1,         1,        10 },
+			{ cItem(E_ITEM_BUCKET),              1,         1,        10 },
+			{ cItem(E_ITEM_BREAD),               1,         1,        10 },
+			{ cItem(E_ITEM_NAME_TAG),            1,         1,        10 },
+		} ;
+
+		cChestEntity * ChestEntity = (cChestEntity *)a_ChunkDesc.GetBlockEntity(RelX, m_FloorHeight + 1, RelZ);
+		ASSERT((ChestEntity != nullptr) && (ChestEntity->GetBlockType() == E_BLOCK_CHEST));
+		cNoise Noise(a_ChunkDesc.GetChunkX() ^ a_ChunkDesc.GetChunkZ());
+		int NumSlots = 3 + ((Noise.IntNoise3DInt(a_Chest.x, a_Chest.y, a_Chest.z) / 11) % 4);
+		int Seed = Noise.IntNoise2DInt(RelX, RelZ);
+		ChestEntity->GetContents().GenerateRandomLootWithBooks(LootProbab, ARRAYCOUNT(LootProbab), NumSlots, Seed);
 	}
 
 
@@ -193,6 +220,7 @@ protected:
 			// The chunk is not intersecting the room at all, bail out
 			return;
 		}
+
 		int b = m_FloorHeight + 1;  // Bottom
 		int t = m_FloorHeight + 1 + ROOM_HEIGHT;  // Top
 		ReplaceCuboidRandom(a_ChunkDesc, m_StartX, m_FloorHeight, m_StartZ, m_EndX + 1, b, m_EndZ + 1, E_BLOCK_MOSSY_COBBLESTONE, E_BLOCK_COBBLESTONE);  // Floor
@@ -230,7 +258,7 @@ protected:
 ////////////////////////////////////////////////////////////////////////////////
 // cDungeonRoomsFinisher:
 
-cDungeonRoomsFinisher::cDungeonRoomsFinisher(cTerrainHeightGen & a_HeightGen, int a_Seed, int a_GridSize, int a_MaxSize, int a_MinSize, const AString & a_HeightDistrib) :
+cDungeonRoomsFinisher::cDungeonRoomsFinisher(cTerrainHeightGenPtr a_HeightGen, int a_Seed, int a_GridSize, int a_MaxSize, int a_MinSize, const AString & a_HeightDistrib) :
 	super(a_Seed + 100, a_GridSize, a_GridSize, a_GridSize, a_GridSize, a_MaxSize, a_MaxSize, 1024),
 	m_HeightGen(a_HeightGen),
 	m_MaxHalfSize((a_MaxSize + 1) / 2),
@@ -266,7 +294,7 @@ cDungeonRoomsFinisher::cStructurePtr cDungeonRoomsFinisher::CreateStructure(int
 	int RelX = a_OriginX, RelY = 0, RelZ = a_OriginZ;
 	cChunkDef::AbsoluteToRelative(RelX, RelY, RelZ, ChunkX, ChunkZ);
 	cChunkDef::HeightMap HeightMap;
-	m_HeightGen.GenHeightMap(ChunkX, ChunkZ, HeightMap);
+	m_HeightGen->GenHeightMap(ChunkX, ChunkZ, HeightMap);
 	int Height = cChunkDef::GetHeight(HeightMap, RelX, RelZ);  // Max room height at {a_OriginX, a_OriginZ}
 	Height = Clamp(m_HeightProbability.MapValue(rnd % m_HeightProbability.GetSum()), 10, Height - 5);
 
diff --git a/src/Generating/DungeonRoomsFinisher.h b/src/Generating/DungeonRoomsFinisher.h
index 2b52c9de6..09dd0448a 100644
--- a/src/Generating/DungeonRoomsFinisher.h
+++ b/src/Generating/DungeonRoomsFinisher.h
@@ -26,12 +26,12 @@ public:
 	a_HeightGen is the underlying height generator, so that the rooms can always be placed under the terrain.
 	a_MaxSize and a_MinSize are the maximum and minimum sizes of the room's internal (air) area, in blocks across.
 	a_HeightDistrib is the string defining the height distribution for the rooms (cProbabDistrib format). */
-	cDungeonRoomsFinisher(cTerrainHeightGen & a_HeightGen, int a_Seed, int a_GridSize, int a_MaxSize, int a_MinSize, const AString & a_HeightDistrib);
+	cDungeonRoomsFinisher(cTerrainHeightGenPtr a_HeightGen, int a_Seed, int a_GridSize, int a_MaxSize, int a_MinSize, const AString & a_HeightDistrib);
 
 protected:
 
 	/** The height gen that is used for limiting the rooms' Y coords */
-	cTerrainHeightGen & m_HeightGen;
+	cTerrainHeightGenPtr m_HeightGen;
 
 	/** Maximum half-size (from center to wall) of the dungeon room's inner (air) area. Default is 3 (vanilla). */
 	int m_MaxHalfSize;
diff --git a/src/Generating/EndGen.cpp b/src/Generating/EndGen.cpp
index c94cd1eff..0111d2fa3 100644
--- a/src/Generating/EndGen.cpp
+++ b/src/Generating/EndGen.cpp
@@ -5,7 +5,7 @@
 
 #include "Globals.h"
 #include "EndGen.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "../LinearUpscale.h"
 
 
diff --git a/src/Generating/FinishGen.cpp b/src/Generating/FinishGen.cpp
index 96e3dc26b..b8afac09a 100644
--- a/src/Generating/FinishGen.cpp
+++ b/src/Generating/FinishGen.cpp
@@ -15,7 +15,7 @@
 #include "../Simulator/FluidSimulator.h"  // for cFluidSimulator::CanWashAway()
 #include "../Simulator/FireSimulator.h"
 #include "../World.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 
 
 
@@ -199,6 +199,11 @@ void cFinishGenTallGrass::GenFinish(cChunkDesc & a_ChunkDesc)
 			
 			// Get the top block + 1. This is the place where the grass would finaly be placed:
 			int y = a_ChunkDesc.GetHeight(x, z) + 1;
+			
+			if (y >= 255)
+			{
+				continue;
+			}
 
 			// Check if long grass can be placed:
 			if (
@@ -414,6 +419,11 @@ void cFinishGenSnow::GenFinish(cChunkDesc & a_ChunkDesc)
 					}
 					break;
 				}
+				default:
+				{
+					// There's no snow in the other biomes.
+					break;
+				}
 			}
 		}
 	}  // for z
@@ -454,6 +464,11 @@ void cFinishGenIce::GenFinish(cChunkDesc & a_ChunkDesc)
 					}
 					break;
 				}
+				default:
+				{
+					// No icy water in other biomes.
+					break;
+				}
 			}
 		}
 	}  // for z
diff --git a/src/Generating/GridStructGen.cpp b/src/Generating/GridStructGen.cpp
index 7090f14b1..3c08c1a39 100644
--- a/src/Generating/GridStructGen.cpp
+++ b/src/Generating/GridStructGen.cpp
@@ -135,7 +135,7 @@ void cGridStructGen::GetStructuresForChunk(int a_ChunkX, int a_ChunkZ, cStructur
 				int OriginX = GridX + ((m_Noise.IntNoise2DInt(GridX + 3, GridZ + 5) / 7) % (m_MaxOffsetX * 2)) - m_MaxOffsetX;
 				int OriginZ = GridZ + ((m_Noise.IntNoise2DInt(GridX + 5, GridZ + 3) / 7) % (m_MaxOffsetZ * 2)) - m_MaxOffsetZ;
 				cStructurePtr Structure = CreateStructure(GridX, GridZ, OriginX, OriginZ);
-				if (Structure.get() == NULL)
+				if (Structure.get() == nullptr)
 				{
 					Structure.reset(new cEmptyStructure(GridX, GridZ, OriginX, OriginZ));
 				}
diff --git a/src/Generating/HeiGen.cpp b/src/Generating/HeiGen.cpp
index 79d529a6a..1d9f1e3aa 100644
--- a/src/Generating/HeiGen.cpp
+++ b/src/Generating/HeiGen.cpp
@@ -6,7 +6,7 @@
 #include "Globals.h"
 #include "HeiGen.h"
 #include "../LinearUpscale.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "DistortedHeightmap.h"
 #include "EndGen.h"
 #include "Noise3DGenerator.h"
@@ -17,81 +17,6 @@
 
 
 ////////////////////////////////////////////////////////////////////////////////
-// cTerrainHeightGen:
-
-cTerrainHeightGen * cTerrainHeightGen::CreateHeightGen(cIniFile &a_IniFile, cBiomeGen & a_BiomeGen, int a_Seed, bool & a_CacheOffByDefault)
-{
-	AString HeightGenName = a_IniFile.GetValueSet("Generator", "HeightGen", "");
-	if (HeightGenName.empty())
-	{
-		LOGWARN("[Generator] HeightGen value not set in world.ini, using \"Biomal\".");
-		HeightGenName = "Biomal";
-	}
-	
-	a_CacheOffByDefault = false;
-	cTerrainHeightGen * res = NULL;
-	if (NoCaseCompare(HeightGenName, "flat") == 0)
-	{
-		res = new cHeiGenFlat;
-		a_CacheOffByDefault = true;  // We're generating faster than a cache would retrieve data
-	}
-	else if (NoCaseCompare(HeightGenName, "classic") == 0)
-	{
-		res = new cHeiGenClassic(a_Seed);
-	}
-	else if (NoCaseCompare(HeightGenName, "DistortedHeightmap") == 0)
-	{
-		res = new cDistortedHeightmap(a_Seed, a_BiomeGen);
-	}
-	else if (NoCaseCompare(HeightGenName, "End") == 0)
-	{
-		res = new cEndGen(a_Seed);
-	}
-	else if (NoCaseCompare(HeightGenName, "Mountains") == 0)
-	{
-		res = new cHeiGenMountains(a_Seed);
-	}
-	else if (NoCaseCompare(HeightGenName, "Noise3D") == 0)
-	{
-		res = new cNoise3DComposable(a_Seed);
-	}
-	else if (NoCaseCompare(HeightGenName, "biomal") == 0)
-	{
-		res = new cHeiGenBiomal(a_Seed, a_BiomeGen);
-
-		/*
-		// Performance-testing:
-		LOGINFO("Measuring performance of cHeiGenBiomal...");
-		clock_t BeginTick = clock();
-		for (int x = 0; x < 500; x++)
-		{
-			cChunkDef::HeightMap Heights;
-			res->GenHeightMap(x * 5, x * 5, Heights);
-		}
-		clock_t Duration = clock() - BeginTick;
-		LOGINFO("HeightGen for 500 chunks took %d ticks (%.02f sec)", Duration, (double)Duration / CLOCKS_PER_SEC);
-		//*/
-	}
-	else
-	{
-		// No match found, force-set the default and retry
-		LOGWARN("Unknown HeightGen \"%s\", using \"Biomal\" instead.", HeightGenName.c_str());
-		a_IniFile.DeleteValue("Generator", "HeightGen");
-		a_IniFile.SetValue("Generator", "HeightGen", "Biomal");
-		return CreateHeightGen(a_IniFile, a_BiomeGen, a_Seed, a_CacheOffByDefault);
-	}
-	
-	// Read the settings:
-	res->InitializeHeightGen(a_IniFile);
-	
-	return res;
-}
-
-
-
-
-
-////////////////////////////////////////////////////////////////////////////////
 // cHeiGenFlat:
 
 void cHeiGenFlat::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
@@ -118,7 +43,7 @@ void cHeiGenFlat::InitializeHeightGen(cIniFile & a_IniFile)
 ////////////////////////////////////////////////////////////////////////////////
 // cHeiGenCache:
 
-cHeiGenCache::cHeiGenCache(cTerrainHeightGen & a_HeiGenToCache, int a_CacheSize) :
+cHeiGenCache::cHeiGenCache(cTerrainHeightGenPtr a_HeiGenToCache, int a_CacheSize) :
 	m_HeiGenToCache(a_HeiGenToCache),
 	m_CacheSize(a_CacheSize),
 	m_CacheOrder(new int[a_CacheSize]),
@@ -142,9 +67,9 @@ cHeiGenCache::cHeiGenCache(cTerrainHeightGen & a_HeiGenToCache, int a_CacheSize)
 cHeiGenCache::~cHeiGenCache()
 {
 	delete[] m_CacheData;
-	m_CacheData = NULL;
+	m_CacheData = nullptr;
 	delete[] m_CacheOrder;
-	m_CacheOrder = NULL;
+	m_CacheOrder = nullptr;
 }
 
 
@@ -190,7 +115,7 @@ void cHeiGenCache::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap
 	
 	// Not in the cache:
 	m_NumMisses++;
-	m_HeiGenToCache.GenHeightMap(a_ChunkX, a_ChunkZ, a_HeightMap);
+	m_HeiGenToCache->GenHeightMap(a_ChunkX, a_ChunkZ, a_HeightMap);
 	
 	// Insert it as the first item in the MRU order:
 	int Idx = m_CacheOrder[m_CacheSize - 1];
@@ -210,7 +135,7 @@ void cHeiGenCache::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap
 
 void cHeiGenCache::InitializeHeightGen(cIniFile & a_IniFile)
 {
-	m_HeiGenToCache.InitializeHeightGen(a_IniFile);
+	m_HeiGenToCache->InitializeHeightGen(a_IniFile);
 }
 
 
@@ -317,7 +242,9 @@ void cHeiGenClassic::InitializeHeightGen(cIniFile & a_IniFile)
 
 cHeiGenMountains::cHeiGenMountains(int a_Seed) :
 	m_Seed(a_Seed),
-	m_Noise(a_Seed)
+	m_MountainNoise(a_Seed + 100),
+	m_DitchNoise(a_Seed + 200),
+	m_Perlin(a_Seed + 300)
 {
 }
 
@@ -332,9 +259,11 @@ void cHeiGenMountains::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::Heigh
 	NOISE_DATATYPE StartZ = (NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width);
 	NOISE_DATATYPE EndZ   = (NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width + cChunkDef::Width - 1);
 	NOISE_DATATYPE Workspace[16 * 16];
-	NOISE_DATATYPE Noise[16 * 16];
+	NOISE_DATATYPE MountainNoise[16 * 16];
+	NOISE_DATATYPE DitchNoise[16 * 16];
 	NOISE_DATATYPE PerlinNoise[16 * 16];
-	m_Noise.Generate2D(Noise, 16, 16, StartX, EndX, StartZ, EndZ, Workspace);
+	m_MountainNoise.Generate2D(MountainNoise, 16, 16, StartX, EndX, StartZ, EndZ, Workspace);
+	m_DitchNoise.Generate2D(DitchNoise, 16, 16, StartX, EndX, StartZ, EndZ, Workspace);
 	m_Perlin.Generate2D(PerlinNoise, 16, 16, StartX, EndX, StartZ, EndZ, Workspace);
 	for (int z = 0; z < cChunkDef::Width; z++)
 	{
@@ -342,7 +271,7 @@ void cHeiGenMountains::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::Heigh
 		for (int x = 0; x < cChunkDef::Width; x++)
 		{
 			int idx = IdxZ + x;
-			int hei = 100 - (int)((Noise[idx] + PerlinNoise[idx]) * 15);
+			int hei = 100 - (int)((MountainNoise[idx] - DitchNoise[idx] + PerlinNoise[idx]) * 15);
 			if (hei < 10)
 			{
 				hei = 10;
@@ -363,9 +292,12 @@ void cHeiGenMountains::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::Heigh
 void cHeiGenMountains::InitializeHeightGen(cIniFile & a_IniFile)
 {
 	// TODO: Read the params from an INI file
-	m_Noise.AddOctave(0.1f,  0.1f);
-	m_Noise.AddOctave(0.05f, 0.5f);
-	m_Noise.AddOctave(0.02f, 1.5f);
+	m_MountainNoise.AddOctave(0.1f,  0.2f);
+	m_MountainNoise.AddOctave(0.05f, 0.4f);
+	m_MountainNoise.AddOctave(0.02f, 1.0f);
+	m_DitchNoise.AddOctave(0.1f,  0.2f);
+	m_DitchNoise.AddOctave(0.05f, 0.4f);
+	m_DitchNoise.AddOctave(0.02f, 1.0f);
 
 	m_Perlin.AddOctave(0.01f, 1.5f);
 }
@@ -423,15 +355,15 @@ const cHeiGenBiomal::sGenParam cHeiGenBiomal::m_GenParam[256] =
 	/* biMesaPlateau         */ { 0.1f,   1.0f,  0.05f,     1.5f,  0.01f,    4.0f,  80},
 	
 	// biomes 40 .. 128 are unused, 89 empty placeholders here:
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 40 .. 49
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 50 .. 59
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 60 .. 69
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 70 .. 79
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 80 .. 89
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 90 .. 99
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 100 .. 109
-	{}, {}, {}, {}, {}, {}, {}, {}, {}, {},  // 110 .. 119
-	{}, {}, {}, {}, {}, {}, {}, {}, {},      // 120 .. 128
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 40 .. 49
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 50 .. 59
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 60 .. 69
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 70 .. 79
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 80 .. 89
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 90 .. 99
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 100 .. 109
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 110 .. 119
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},                                           // 120 .. 128
 	
 	/* biSunflowerPlains      */ { 0.1f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  40},  // 129
 	/* biDesertM              */ { 0.1f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  40},  // 130
@@ -441,22 +373,22 @@ const cHeiGenBiomal::sGenParam cHeiGenBiomal::m_GenParam[256] =
 	/* biSwamplandM           */ { 1.0f,   3.0f,  1.10f,     7.0f,  0.01f,   0.01f,  60},  // 134
 	
 	// Biomes 135 .. 139 unused, 5 empty placeholders here:
-	{}, {}, {}, {}, {},                                                                    // 135 .. 139
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 135 .. 139
 	
 	/* biIcePlainsSpikes      */ { 0.1f,   2.0f,  0.05f,    12.0f,  0.01f,   10.0f,  40},  // 140
 	
 	// Biomes 141 .. 148 unused, 8 empty placeholders here:
-	{}, {}, {}, {}, {}, {}, {}, {},                                                        // 141 .. 148
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 141 .. 148
 	
 	/* biJungleM              */ { 0.1f,   3.0f,  0.05f,     6.0f,  0.01f,    6.0f,  70},  // 149
-	{},                                                                                    // 150
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},                                               // 150
 	/* biJungleEdgeM          */ { 0.1f,   3.0f,  0.05f,     6.0f,  0.01f,    6.0f,  70},  // 151
-	{}, {}, {},                                                                            // 152 .. 154
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0}, {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},  // 152 .. 154
 	/* biBirchForestM         */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},  // 155
 	/* biBirchForestHillsM    */ { 0.2f,   2.0f,  0.05f,    10.0f,  0.01f,    8.0f,  80},  // 156
 	/* biRoofedForestM        */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},  // 157
 	/* biColdTaigaM           */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},  // 158
-	{},                                                                                    // 159
+	{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0},                                               // 159
 	/* biMegaSpruceTaiga      */ { 0.1f,   1.0f,  0.05f,     2.0f,  0.01f,    4.0f,  70},  // 160
 	/* biMegaSpruceTaigaHills */ { 0.2f,   2.0f,  0.05f,    10.0f,  0.01f,    8.0f,  80},  // 161
 	/* biExtremeHillsPlusM    */ { 0.2f,   4.0f,  0.05f,    20.0f,  0.01f,   16.0f, 120},  // 162
@@ -479,7 +411,7 @@ void cHeiGenBiomal::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMa
 	{
 		for (int x = -1; x <= 1; x++)
 		{
-			m_BiomeGen.GenBiomes(a_ChunkX + x, a_ChunkZ + z, Biomes[x + 1][z + 1]);
+			m_BiomeGen->GenBiomes(a_ChunkX + x, a_ChunkZ + z, Biomes[x + 1][z + 1]);
 		}  // for x
 	}  // for z
 	
@@ -604,3 +536,287 @@ NOISE_DATATYPE cHeiGenBiomal::GetHeightAt(int a_RelX, int a_RelZ, int a_ChunkX,
 
 
 
+////////////////////////////////////////////////////////////////////////////////
+// cHeiGenMinMax:
+
+class cHeiGenMinMax:
+	public cTerrainHeightGen
+{
+	typedef cTerrainHeightGen super;
+
+	/** Size of the averaging process, in columns (for each direction). Must be less than 16. */
+	static const int AVERAGING_SIZE = 4;
+
+public:
+	cHeiGenMinMax(int a_Seed, cBiomeGenPtr a_BiomeGen):
+		m_Noise(a_Seed),
+		m_BiomeGen(a_BiomeGen),
+		m_TotalWeight(0)
+	{
+		// Initialize the weights:
+		for (int z = 0; z <= AVERAGING_SIZE * 2; z++)
+		{
+			for (int x = 0; x <= AVERAGING_SIZE * 2; x++)
+			{
+				m_Weights[z][x] = 1 + 2 * AVERAGING_SIZE - std::abs(x - AVERAGING_SIZE) - std::abs(z - AVERAGING_SIZE);
+				m_TotalWeight += m_Weights[z][x];
+			}
+		}
+
+		// Initialize the Perlin generator:
+		m_Perlin.AddOctave(0.04f,   0.2f);
+		m_Perlin.AddOctave(0.02f,   0.1f);
+		m_Perlin.AddOctave(0.01f,   0.05f);
+	}
+
+
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+	{
+		// Generate the biomes for the 3*3 neighbors:
+		cChunkDef::BiomeMap neighborBiomes[3][3];
+		for (int z = 0; z < 3; z++) for (int x = 0; x < 3; x++)
+		{
+			m_BiomeGen->GenBiomes(a_ChunkX + x - 1, a_ChunkZ + z - 1, neighborBiomes[z][x]);
+		}
+
+		// Get the min and max heights based on the biomes:
+		double minHeight[cChunkDef::Width * cChunkDef::Width];
+		double maxHeight[cChunkDef::Width * cChunkDef::Width];
+		for (int z = 0; z < cChunkDef::Width; z++)
+		{
+			for (int x = 0; x < cChunkDef::Width; x++)
+			{
+				// For each column, sum the min and max values of the neighborhood around it:
+				double min = 0, max = 0;
+				for (int relz = 0; relz <= AVERAGING_SIZE * 2; relz++)
+				{
+					int bz = z + 16 + relz - AVERAGING_SIZE;  // Biome Z coord relative to the neighborBiomes start
+					int cz = bz / 16;                         // Chunk Z coord relative to the neighborBiomes start
+					bz = bz % 16;                             // Biome Z coord relative to cz in neighborBiomes
+					for (int relx = 0; relx <= AVERAGING_SIZE * 2; relx++)
+					{
+						int bx = x + 16 + relx - AVERAGING_SIZE;  // Biome X coord relative to the neighborBiomes start
+						int cx = bx / 16;                         // Chunk X coord relative to the neighborBiomes start
+						bx = bx % 16;                             // Biome X coord relative to cz in neighborBiomes
+
+						// Get the biome's min and max heights:
+						double bmin, bmax;
+						getBiomeMinMax(cChunkDef::GetBiome(neighborBiomes[cz][cx], bx, bz), bmin, bmax);
+
+						// Add them to the total, with the weight depending on their relative position to the column:
+						min += bmin * m_Weights[relz][relx];
+						max += bmax * m_Weights[relz][relx];
+					}  // for relx
+				}  // for relz
+				minHeight[x + z * cChunkDef::Width] = min / m_TotalWeight;
+				maxHeight[x + z * cChunkDef::Width] = max / m_TotalWeight;
+			}  // for x
+		}  // for z
+
+		// Generate the base noise:
+		NOISE_DATATYPE noise[cChunkDef::Width * cChunkDef::Width];
+		NOISE_DATATYPE workspace[cChunkDef::Width * cChunkDef::Width];
+		NOISE_DATATYPE startX = static_cast<float>(a_ChunkX * cChunkDef::Width);
+		NOISE_DATATYPE endX = startX + cChunkDef::Width - 1;
+		NOISE_DATATYPE startZ = static_cast<float>(a_ChunkZ * cChunkDef::Width);
+		NOISE_DATATYPE endZ = startZ + cChunkDef::Width - 1;
+		m_Perlin.Generate2D(noise, 16, 16, startX, endX, startZ, endZ, workspace);
+
+		// Make the height by ranging the noise between min and max:
+		for (int z = 0; z < cChunkDef::Width; z++)
+		{
+			for (int x = 0; x < cChunkDef::Width; x++)
+			{
+				double min = minHeight[x + z * cChunkDef::Width];
+				double max = maxHeight[x + z * cChunkDef::Width];
+				double h = (max + min) / 2 + noise[x + z * cChunkDef::Width] * (max - min);
+				cChunkDef::SetHeight(a_HeightMap, x, z, static_cast<HEIGHTTYPE>(h));
+			}
+		}
+	}
+
+	
+	virtual void InitializeHeightGen(cIniFile & a_IniFile)
+	{
+		// No settings available
+	}
+
+protected:
+	cNoise m_Noise;
+
+	cPerlinNoise m_Perlin;
+
+	/** The biome generator to query for the underlying biomes. */
+	cBiomeGenPtr m_BiomeGen;
+
+	/** Weights applied to each of the min / max values in the neighborhood of the currently evaluated column. */
+	double m_Weights[AVERAGING_SIZE * 2 + 1][AVERAGING_SIZE * 2 + 1];
+
+	/** Sum of all the m_Weights items. */
+	double m_TotalWeight;
+
+
+	/** Returns the minimum and maximum heights for the given biome. */
+	void getBiomeMinMax(EMCSBiome a_Biome, double & a_Min, double & a_Max)
+	{
+		switch (a_Biome)
+		{
+			case biBeach:                a_Min = 61; a_Max = 64; break;
+			case biBirchForest:          a_Min = 63; a_Max = 75; break;
+			case biBirchForestHills:     a_Min = 63; a_Max = 90; break;
+			case biBirchForestHillsM:    a_Min = 63; a_Max = 90; break;
+			case biBirchForestM:         a_Min = 63; a_Max = 75; break;
+			case biColdBeach:            a_Min = 61; a_Max = 64; break;
+			case biColdTaiga:            a_Min = 63; a_Max = 75; break;
+			case biColdTaigaHills:       a_Min = 63; a_Max = 90; break;
+			case biColdTaigaM:           a_Min = 63; a_Max = 75; break;
+			case biDeepOcean:            a_Min = 30; a_Max = 60; break;
+			case biDesert:               a_Min = 63; a_Max = 70; break;
+			case biDesertHills:          a_Min = 63; a_Max = 85; break;
+			case biDesertM:              a_Min = 63; a_Max = 70; break;
+			case biEnd:                  a_Min = 10; a_Max = 100; break;
+			case biExtremeHills:         a_Min = 60; a_Max = 120; break;
+			case biExtremeHillsEdge:     a_Min = 63; a_Max = 100; break;
+			case biExtremeHillsM:        a_Min = 60; a_Max = 120; break;
+			case biExtremeHillsPlus:     a_Min = 60; a_Max = 140; break;
+			case biExtremeHillsPlusM:    a_Min = 60; a_Max = 140; break;
+			case biFlowerForest:         a_Min = 63; a_Max = 75; break;
+			case biForest:               a_Min = 63; a_Max = 75; break;
+			case biForestHills:          a_Min = 63; a_Max = 90; break;
+			case biFrozenOcean:          a_Min = 45; a_Max = 64; break;
+			case biFrozenRiver:          a_Min = 60; a_Max = 62; break;
+			case biIceMountains:         a_Min = 63; a_Max = 90; break;
+			case biIcePlains:            a_Min = 63; a_Max = 70; break;
+			case biIcePlainsSpikes:      a_Min = 60; a_Max = 70; break;
+			case biJungle:               a_Min = 60; a_Max = 80; break;
+			case biJungleEdge:           a_Min = 62; a_Max = 75; break;
+			case biJungleEdgeM:          a_Min = 62; a_Max = 75; break;
+			case biJungleHills:          a_Min = 60; a_Max = 90; break;
+			case biJungleM:              a_Min = 60; a_Max = 75; break;
+			case biMegaSpruceTaiga:      a_Min = 63; a_Max = 75; break;
+			case biMegaSpruceTaigaHills: a_Min = 63; a_Max = 90; break;
+			case biMegaTaiga:            a_Min = 63; a_Max = 75; break;
+			case biMegaTaigaHills:       a_Min = 63; a_Max = 90; break;
+			case biMesa:                 a_Min = 63; a_Max = 90; break;
+			case biMesaBryce:            a_Min = 60; a_Max = 67; break;
+			case biMesaPlateau:          a_Min = 75; a_Max = 85; break;
+			case biMesaPlateauF:         a_Min = 80; a_Max = 90; break;
+			case biMesaPlateauFM:        a_Min = 80; a_Max = 90; break;
+			case biMesaPlateauM:         a_Min = 75; a_Max = 85; break;
+			case biMushroomIsland:       a_Min = 63; a_Max = 90; break;
+			case biMushroomShore:        a_Min = 60; a_Max = 75; break;
+			case biNether:               a_Min = 10; a_Max = 100; break;
+			case biOcean:                a_Min = 45; a_Max = 64; break;
+			case biPlains:               a_Min = 63; a_Max = 70; break;
+			case biRiver:                a_Min = 60; a_Max = 62; break;
+			case biRoofedForest:         a_Min = 63; a_Max = 75; break;
+			case biRoofedForestM:        a_Min = 63; a_Max = 75; break;
+			case biSavanna:              a_Min = 63; a_Max = 75; break;
+			case biSavannaM:             a_Min = 63; a_Max = 80; break;
+			case biSavannaPlateau:       a_Min = 75; a_Max = 100; break;
+			case biSavannaPlateauM:      a_Min = 80; a_Max = 160; break;
+			case biStoneBeach:           a_Min = 60; a_Max = 64; break;
+			case biSunflowerPlains:      a_Min = 63; a_Max = 70; break;
+			case biSwampland:            a_Min = 60; a_Max = 67; break;
+			case biSwamplandM:           a_Min = 61; a_Max = 67; break;
+			case biTaiga:                a_Min = 63; a_Max = 75; break;
+			case biTaigaHills:           a_Min = 63; a_Max = 90; break;
+			case biTaigaM:               a_Min = 63; a_Max = 80; break;
+			default:
+			{
+				ASSERT(!"Unknown biome");
+				a_Min = 10;
+				a_Max = 10;
+				break;
+			}
+		}
+	}
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cTerrainHeightGen:
+
+cTerrainHeightGenPtr cTerrainHeightGen::CreateHeightGen(cIniFile & a_IniFile, cBiomeGenPtr a_BiomeGen, int a_Seed, bool & a_CacheOffByDefault)
+{
+	AString HeightGenName = a_IniFile.GetValueSet("Generator", "HeightGen", "");
+	if (HeightGenName.empty())
+	{
+		LOGWARN("[Generator] HeightGen value not set in world.ini, using \"Biomal\".");
+		HeightGenName = "Biomal";
+	}
+	
+	a_CacheOffByDefault = false;
+	cTerrainHeightGen * res = nullptr;
+	if (NoCaseCompare(HeightGenName, "flat") == 0)
+	{
+		res = new cHeiGenFlat;
+		a_CacheOffByDefault = true;  // We're generating faster than a cache would retrieve data
+	}
+	else if (NoCaseCompare(HeightGenName, "classic") == 0)
+	{
+		res = new cHeiGenClassic(a_Seed);
+	}
+	else if (NoCaseCompare(HeightGenName, "DistortedHeightmap") == 0)
+	{
+		res = new cDistortedHeightmap(a_Seed, a_BiomeGen);
+	}
+	else if (NoCaseCompare(HeightGenName, "End") == 0)
+	{
+		res = new cEndGen(a_Seed);
+	}
+	else if (NoCaseCompare(HeightGenName, "MinMax") == 0)
+	{
+		res = new cHeiGenMinMax(a_Seed, a_BiomeGen);
+	}
+	else if (NoCaseCompare(HeightGenName, "Mountains") == 0)
+	{
+		res = new cHeiGenMountains(a_Seed);
+	}
+	else if (NoCaseCompare(HeightGenName, "BiomalNoise3D") == 0)
+	{
+		res = new cBiomalNoise3DComposable(a_Seed, a_BiomeGen);
+	}
+	else if (NoCaseCompare(HeightGenName, "Noise3D") == 0)
+	{
+		res = new cNoise3DComposable(a_Seed);
+	}
+	else if (NoCaseCompare(HeightGenName, "biomal") == 0)
+	{
+		res = new cHeiGenBiomal(a_Seed, a_BiomeGen);
+
+		/*
+		// Performance-testing:
+		LOGINFO("Measuring performance of cHeiGenBiomal...");
+		clock_t BeginTick = clock();
+		for (int x = 0; x < 500; x++)
+		{
+			cChunkDef::HeightMap Heights;
+			res->GenHeightMap(x * 5, x * 5, Heights);
+		}
+		clock_t Duration = clock() - BeginTick;
+		LOGINFO("HeightGen for 500 chunks took %d ticks (%.02f sec)", Duration, (double)Duration / CLOCKS_PER_SEC);
+		//*/
+	}
+	else
+	{
+		// No match found, force-set the default and retry
+		LOGWARN("Unknown HeightGen \"%s\", using \"Biomal\" instead.", HeightGenName.c_str());
+		a_IniFile.DeleteValue("Generator", "HeightGen");
+		a_IniFile.SetValue("Generator", "HeightGen", "Biomal");
+		return CreateHeightGen(a_IniFile, a_BiomeGen, a_Seed, a_CacheOffByDefault);
+	}
+	
+	// Read the settings:
+	res->InitializeHeightGen(a_IniFile);
+	
+	return cTerrainHeightGenPtr(res);
+}
+
+
+
+
+
diff --git a/src/Generating/HeiGen.h b/src/Generating/HeiGen.h
index 5c106c7d9..6ae5ba362 100644
--- a/src/Generating/HeiGen.h
+++ b/src/Generating/HeiGen.h
@@ -45,7 +45,7 @@ class cHeiGenCache :
 	public cTerrainHeightGen
 {
 public:
-	cHeiGenCache(cTerrainHeightGen & a_HeiGenToCache, int a_CacheSize);  // Doesn't take ownership of a_HeiGenToCache
+	cHeiGenCache(cTerrainHeightGenPtr a_HeiGenToCache, int a_CacheSize);
 	~cHeiGenCache();
 	
 	// cTerrainHeightGen overrides:
@@ -57,7 +57,7 @@ public:
 	
 protected:
 
-	cTerrainHeightGen & m_HeiGenToCache;
+	cTerrainHeightGenPtr m_HeiGenToCache;
 	
 	struct sCacheData
 	{
@@ -115,7 +115,8 @@ public:
 protected:
 
 	int m_Seed;
-	cRidgedMultiNoise m_Noise;
+	cRidgedMultiNoise m_MountainNoise;
+	cRidgedMultiNoise m_DitchNoise;
 	cPerlinNoise m_Perlin;
 	
 	// cTerrainHeightGen overrides:
@@ -131,7 +132,7 @@ class cHeiGenBiomal :
 	public cTerrainHeightGen
 {
 public:
-	cHeiGenBiomal(int a_Seed, cBiomeGen & a_BiomeGen) :
+	cHeiGenBiomal(int a_Seed, cBiomeGenPtr a_BiomeGen) :
 		m_Noise(a_Seed),
 		m_BiomeGen(a_BiomeGen)
 	{
@@ -141,8 +142,8 @@ protected:
 
 	typedef cChunkDef::BiomeMap BiomeNeighbors[3][3];
 
-	cNoise      m_Noise;
-	cBiomeGen & m_BiomeGen;
+	cNoise       m_Noise;
+	cBiomeGenPtr m_BiomeGen;
 	
 	// Per-biome terrain generator parameters:
 	struct sGenParam
diff --git a/src/Generating/IntGen.h b/src/Generating/IntGen.h
new file mode 100644
index 000000000..b25e378c0
--- /dev/null
+++ b/src/Generating/IntGen.h
@@ -0,0 +1,1406 @@
+
+// IntGen.h
+
+// Declares the cIntGen class and descendants for generating and filtering various 2D arrays of ints
+
+/*
+The integers generated may be interpreted in several ways:
+- land/see designators
+	- 0 = ocean
+	- >0 = land
+- biome group
+	- 0 = ocean
+	- 1 = desert biomes
+	- 2 = temperate biomes
+	- 3 = mountains (hills and forests)
+	- 4 = ice biomes
+- biome group with "bgfRare" flag (for generating rare biomes for the group)
+- biome IDs
+The interpretation depends on the generator used and on the position in the chain.
+
+The generators can be chained together - one produces data that another one consumes.
+Some of such chain connections require changing the data dimensions between the two, which is handled automatically
+by using templates.
+*/
+
+
+
+
+
+#pragma once
+
+#include "../BiomeDef.h"
+
+
+
+
+
+/** Constants representing the biome group designators. */
+const int bgOcean        = 0;
+const int bgDesert       = 1;
+const int bgTemperate    = 2;
+const int bgMountains    = 3;
+const int bgIce          = 4;
+const int bgLandOceanMax = 4;  // Maximum biome group value generated in the landOcean generator
+const int bgfRare        = 1024;  // Flag added to values to generate rare biomes for the group
+
+
+
+
+
+/** Interface that all the generator classes provide. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGen
+{
+public:
+	/** Force a virtual destructor in all descendants.
+	Descendants contain virtual functions and are referred to via pointer-to-base, so they need a virtual destructor. */
+	virtual ~cIntGen() {}
+
+	/** Holds the array of values generated by this class (descendant). */
+	typedef int Values[SizeX * SizeZ];
+
+	/** Generates the array of templated size into a_Values, based on given min coords. */
+	virtual void GetInts(int a_MinX, int a_MinZ, Values & a_Values) = 0;
+};
+
+
+
+
+
+/** Provides additional cNoise member and its helper functions. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenWithNoise :
+	public cIntGen<SizeX, SizeZ>
+{
+	typedef cIntGen<SizeX, SizeZ> super;
+
+public:
+	cIntGenWithNoise(int a_Seed) :
+		m_Noise(a_Seed)
+	{
+	}
+
+protected:
+	cNoise m_Noise;
+
+	/** Chooses one of a_Val1 or a_Val2, based on m_Noise and the coordinates for querying the noise. */
+	int ChooseRandomOne(int a_RndX, int a_RndZ, int a_Val1, int a_Val2)
+	{
+		int rnd = m_Noise.IntNoise2DInt(a_RndX, a_RndZ) / 7;
+		return ((rnd & 1) == 0) ? a_Val1 : a_Val2;
+	}
+
+	/** Chooses one of a_ValN, based on m_Noise and the coordinates for querying the noise. */
+	int ChooseRandomOne(int a_RndX, int a_RndZ, int a_Val1, int a_Val2, int a_Val3, int a_Val4)
+	{
+		int rnd = m_Noise.IntNoise2DInt(a_RndX, a_RndZ) / 7;
+		switch (rnd % 4)
+		{
+			case 0:  return a_Val1;
+			case 1:  return a_Val2;
+			case 2:  return a_Val3;
+			default: return a_Val4;
+		}
+	}
+};
+
+
+
+
+
+
+/** Generates a 2D array of random integers in the specified range [0 .. Range). */
+template <int Range, int SizeX, int SizeZ = SizeX>
+class cIntGenChoice :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	cIntGenChoice(int a_Seed) :
+		super(a_Seed)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int BaseZ = a_MinZ + z;
+			for (int x = 0; x < SizeX; x++)
+			{
+				a_Values[x + SizeX * z] = (super::m_Noise.IntNoise2DInt(a_MinX + x, BaseZ) / 7) % Range;
+			}
+		}  // for z
+	}
+};
+
+
+
+
+
+
+/** Decides between the ocean and landmass biomes.
+Has a threshold (in percent) of how much land, the larger the threshold, the more land.
+Generates 0 for ocean, biome group ID for landmass. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenLandOcean :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	cIntGenLandOcean(int a_Seed, int a_Threshold) :
+		super(a_Seed),
+		m_Threshold(a_Threshold)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int BaseZ = a_MinZ + z;
+			for (int x = 0; x < SizeX; x++)
+			{
+				int rnd = (super::m_Noise.IntNoise2DInt(a_MinX + x, BaseZ) / 7);
+				a_Values[x + SizeX * z] = ((rnd % 100) < m_Threshold) ? ((rnd / 101) % bgLandOceanMax + 1) : 0;
+			}
+		}
+
+		// If the centerpoint of the world is within the area, set it to bgTemperate, always:
+		if ((a_MinX <= 0) && (a_MinZ <= 0) && (a_MinX + SizeX > 0) && (a_MinZ + SizeZ > 0))
+		{
+			a_Values[-a_MinX - a_MinZ * SizeX] = bgTemperate;
+		}
+	}
+
+protected:
+	int m_Threshold;
+};
+
+
+
+
+
+/** Zooms the underlying value array to twice the size. Uses random-neighbor for the pixels in-between.
+This means that the zoome out image is randomly distorted. Applying zoom several times provides all
+the distortion that the generators need. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenZoom :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+protected:
+	static const int m_LowerSizeX = (SizeX / 2) + 2;
+	static const int m_LowerSizeZ = (SizeZ / 2) + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<m_LowerSizeX, m_LowerSizeZ>> Underlying;
+
+
+	cIntGenZoom(int a_Seed, Underlying a_UnderlyingGen) :
+		super(a_Seed),
+		m_UnderlyingGen(a_UnderlyingGen)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data with half the resolution:
+		int lowerMinX = a_MinX >> 1;
+		int lowerMinZ = a_MinZ >> 1;
+		int lowerData[m_LowerSizeX * m_LowerSizeZ];
+		m_UnderlyingGen->GetInts(lowerMinX, lowerMinZ, lowerData);
+		const int lowStepX = (m_LowerSizeX - 1) * 2;
+		const int lowStepZ = (m_LowerSizeZ - 1) * 2;
+		int cache[lowStepX * lowStepZ];
+
+		// Discreet-interpolate the values into twice the size:
+		for (int z = 0; z < m_LowerSizeZ - 1; ++z)
+		{
+			int idx = (z * 2) * lowStepX;
+			int PrevZ0 = lowerData[z * m_LowerSizeX];
+			int PrevZ1 = lowerData[(z + 1) * m_LowerSizeX];
+
+			for (int x = 0; x < m_LowerSizeX - 1; ++x)
+			{
+				int ValX1Z0 = lowerData[x + 1 + z * m_LowerSizeX];
+				int ValX1Z1 = lowerData[x + 1 + (z + 1) * m_LowerSizeX];
+				int RndX = (x + lowerMinX) * 2;
+				int RndZ = (z + lowerMinZ) * 2;
+				cache[idx] = PrevZ0;
+				cache[idx + lowStepX] = super::ChooseRandomOne(RndX, RndZ + 1, PrevZ0, PrevZ1);
+				cache[idx + 1]        = super::ChooseRandomOne(RndX, RndZ - 1, PrevZ0, ValX1Z0);
+				cache[idx + 1 + lowStepX] = super::ChooseRandomOne(RndX, RndZ, PrevZ0, ValX1Z0, PrevZ1, ValX1Z1);
+				idx += 2;
+				PrevZ0 = ValX1Z0;
+				PrevZ1 = ValX1Z1;
+			}
+		}
+
+		// Copy from Cache into a_Values; take into account the even/odd offsets in a_Min:
+		for (int z = 0; z < SizeZ; ++z)
+		{
+			memcpy(a_Values + z * SizeX, cache + (z + (a_MinZ & 1)) * lowStepX + (a_MinX & 1), SizeX * sizeof(int));
+		}
+	}
+
+protected:
+	Underlying m_UnderlyingGen;
+};
+
+
+
+
+
+/** Smoothes out some artifacts generated by the zooming - mostly single-pixel values.
+Compares each pixel to its neighbors and if the neighbors are equal, changes the pixel to their value. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenSmooth :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+	static const int m_LowerSizeX = SizeX + 2;
+	static const int m_LowerSizeZ = SizeZ + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<m_LowerSizeX, m_LowerSizeZ>> Underlying;
+
+
+	cIntGenSmooth(int a_Seed, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying values:
+		int lowerData[m_LowerSizeX * m_LowerSizeZ];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerData);
+
+		// Smooth - for each square check if the surroundings are the same, if so, expand them diagonally.
+		// Also get rid of single-pixel irregularities (A-B-A):
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int NoiseZ = a_MinZ + z;
+			for (int x = 0; x < SizeX; x++)
+			{
+				int val   = lowerData[x + 1 + (z + 1) * m_LowerSizeX];
+				int above = lowerData[x + 1 +  z      * m_LowerSizeX];
+				int below = lowerData[x + 1 + (z + 2) * m_LowerSizeX];
+				int left  = lowerData[x     + (z + 1) * m_LowerSizeX];
+				int right = lowerData[x + 2 + (z + 1) * m_LowerSizeX];
+
+				if ((left == right) && (above == below))
+				{
+					if (((super::m_Noise.IntNoise2DInt(a_MinX + x, NoiseZ) / 7) % 2) == 0)
+					{
+						val = left;
+					}
+					else
+					{
+						val = above;
+					}
+				}
+				else
+				{
+					if (left == right)
+					{
+						val = left;
+					}
+
+					if (above == below)
+					{
+						val = above;
+					}
+				}
+
+				a_Values[x + z * SizeX] = val;
+			}
+		}
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Converts land biomes at the edge of an ocean into the respective beach biome. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenBeaches :
+	public cIntGen<SizeX, SizeZ>
+{
+	typedef cIntGen<SizeX, SizeZ> super;
+	static const int m_UnderlyingSizeX = SizeX + 2;
+	static const int m_UnderlyingSizeZ = SizeZ + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<m_UnderlyingSizeX, m_UnderlyingSizeZ>> Underlying;
+
+
+	cIntGenBeaches(Underlying a_Underlying) :
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Map for biome -> its beach:
+		static const int ToBeach[] =
+		{
+			/* biOcean            */ biOcean,
+			/* biPlains           */ biBeach,
+			/* biDesert           */ biBeach,
+			/* biExtremeHills     */ biStoneBeach,
+			/* biForest           */ biBeach,
+			/* biTaiga            */ biColdBeach,
+			/* biSwampland        */ biSwampland,
+			/* biRiver            */ biRiver,
+			/* biNether           */ biNether,
+			/* biEnd              */ biEnd,
+			/* biFrozenOcean      */ biColdBeach,
+			/* biFrozenRiver      */ biColdBeach,
+			/* biIcePlains        */ biColdBeach,
+			/* biIceMountains     */ biColdBeach,
+			/* biMushroomIsland   */ biMushroomShore,
+			/* biMushroomShore    */ biMushroomShore,
+			/* biBeach            */ biBeach,
+			/* biDesertHills      */ biBeach,
+			/* biForestHills      */ biBeach,
+			/* biTaigaHills       */ biColdBeach,
+			/* biExtremeHillsEdge */ biStoneBeach,
+			/* biJungle           */ biBeach,
+			/* biJungleHills      */ biBeach,
+			/* biJungleEdge       */ biBeach,
+			/* biDeepOcean        */ biOcean,
+			/* biStoneBeach       */ biStoneBeach,
+			/* biColdBeach        */ biColdBeach,
+			/* biBirchForest      */ biBeach,
+			/* biBirchForestHills */ biBeach,
+			/* biRoofedForest     */ biBeach,
+			/* biColdTaiga        */ biColdBeach,
+			/* biColdTaigaHills   */ biColdBeach,
+			/* biMegaTaiga        */ biStoneBeach,
+			/* biMegaTaigaHills   */ biStoneBeach,
+			/* biExtremeHillsPlus */ biStoneBeach,
+			/* biSavanna          */ biBeach,
+			/* biSavannaPlateau   */ biBeach,
+			/* biMesa             */ biMesa,
+			/* biMesaPlateauF     */ biMesa,
+			/* biMesaPlateau      */ biMesa,
+		};
+
+		// Generate the underlying values:
+		int lowerValues[m_UnderlyingSizeX * m_UnderlyingSizeZ];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerValues);
+
+		// Add beaches between ocean and biomes:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int val   = lowerValues[x + 1 + (z + 1) * m_UnderlyingSizeX];
+				int above = lowerValues[x + 1 + z       * m_UnderlyingSizeX];
+				int below = lowerValues[x + 1 + (z + 2) * m_UnderlyingSizeX];
+				int left  = lowerValues[x     + (z + 1) * m_UnderlyingSizeX];
+				int right = lowerValues[x + 2 + (z + 1) * m_UnderlyingSizeX];
+				if (!IsBiomeOcean(val))
+				{
+					if (IsBiomeOcean(above) || IsBiomeOcean(below) || IsBiomeOcean(left) || IsBiomeOcean(right))
+					{
+						// First convert the value to a regular biome (drop the M flag), then modulo by our biome count:
+						val = ToBeach[(val % 128) % ARRAYCOUNT(ToBeach)];
+					}
+				}
+				a_Values[x + z * SizeX] = val;
+			}
+		}
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Generates the underlying numbers and then randomly changes some ocean group pixels into random land
+biome group pixels, based on the predefined chance. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenAddIslands :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenAddIslands(int a_Seed, int a_Chance, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				if (a_Values[x + z * SizeX] == bgOcean)
+				{
+					int rnd = super::m_Noise.IntNoise2DInt(a_MinX + x, a_MinZ + z) / 7;
+					if (rnd % 1000 < m_Chance)
+					{
+						a_Values[x + z * SizeX] = (rnd / 1003) % bgLandOceanMax;
+					}
+				}
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	/** Chance, in permille, of an island being generated in ocean. */
+	int m_Chance;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** A filter that adds an edge biome group between two biome groups that need an edge between them. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenBiomeGroupEdges :
+	public cIntGen<SizeX, SizeZ>
+{
+	typedef cIntGen<SizeX, SizeZ> super;
+
+	static const int m_UnderlyingSizeX = SizeX + 2;
+	static const int m_UnderlyingSizeZ = SizeZ + 2;
+
+public:
+
+	typedef std::shared_ptr<cIntGen<m_UnderlyingSizeX, m_UnderlyingSizeZ>> Underlying;
+
+	cIntGenBiomeGroupEdges(Underlying a_Underlying) :
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values)
+	{
+		// Generate the underlying biome groups:
+		int lowerValues[m_UnderlyingSizeX * m_UnderlyingSizeZ];
+		m_Underlying->GetInts(a_MinX, a_MinZ, lowerValues);
+
+		// Change the biomes on incompatible edges into an edge biome:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int val   = lowerValues[x + 1 + (z + 1) * m_UnderlyingSizeX];
+				int above = lowerValues[x + 1 + z       * m_UnderlyingSizeX];
+				int below = lowerValues[x + 1 + (z + 2) * m_UnderlyingSizeX];
+				int left  = lowerValues[x     + (z + 1) * m_UnderlyingSizeX];
+				int right = lowerValues[x + 2 + (z + 1) * m_UnderlyingSizeX];
+				switch (val)
+				{
+					// Desert should neighbor only oceans, desert and temperates; change to temperate when another:
+					case bgDesert:
+					{
+						if (
+							!isDesertCompatible(above) ||
+							!isDesertCompatible(below) ||
+							!isDesertCompatible(left) ||
+							!isDesertCompatible(right)
+						)
+						{
+							val = bgTemperate;
+						}
+						break;
+					}  // case bgDesert
+
+					// Ice should not neighbor deserts; change to temperate:
+					case bgIce:
+					{
+						if (
+							(above == bgDesert) ||
+							(below == bgDesert) ||
+							(left  == bgDesert) ||
+							(right == bgDesert)
+						)
+						{
+							val = bgTemperate;
+						}
+						break;
+					}  // case bgIce
+				}
+				a_Values[x + z * SizeX] = val;
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Underlying;
+
+
+	inline bool isDesertCompatible(int a_BiomeGroup)
+	{
+		switch (a_BiomeGroup)
+		{
+			case bgOcean:
+			case bgDesert:
+			case bgTemperate:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+};
+
+
+
+
+
+/** Turns biome group indices into real biomes.
+For each pixel, takes its biome group and chooses a random biome from that group; replaces the value with
+that biome. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenBiomes :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenBiomes(int a_Seed, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Define the per-biome-group biomes:
+		static const int oceanBiomes[] =
+		{
+			biOcean,  // biDeepOcean,
+		};
+
+		// Same as oceanBiomes, there are no rare oceanic biomes (mushroom islands are handled separately)
+		static const int rareOceanBiomes[] =
+		{
+			biOcean,
+		};
+
+		static const int desertBiomes[] =
+		{
+			biDesert, biDesert, biDesert, biDesert, biDesert, biDesert, biSavanna, biSavanna, biPlains,
+		};
+
+		static const int rareDesertBiomes[] =
+		{
+			biMesaPlateau, biMesaPlateauF,
+		};
+
+		static const int temperateBiomes[] =
+		{
+			biForest, biForest, biRoofedForest, biExtremeHills, biPlains, biBirchForest, biSwampland,
+		};
+
+		static const int rareTemperateBiomes[] =
+		{
+			biJungle,  // Jungle is not strictly temperate, but let's piggyback it here
+		};
+
+		static const int mountainBiomes[] =
+		{
+			biExtremeHills, biForest, biTaiga, biPlains,
+		};
+
+		static const int rareMountainBiomes[] =
+		{
+			biMegaTaiga,
+		};
+
+		static const int iceBiomes[] =
+		{
+			biIcePlains, biIcePlains, biIcePlains, biIcePlains, biColdTaiga,
+		};
+
+		// Same as iceBiomes, there's no rare ice biome
+		static const int rareIceBiomes[] =
+		{
+			biIcePlains, biIcePlains, biIcePlains, biIcePlains, biColdTaiga,
+		};
+
+		static const cBiomesInGroups biomesInGroups[] =
+		{
+			/* bgOcean */     { static_cast<int>(ARRAYCOUNT(oceanBiomes)),     oceanBiomes},
+			/* bgDesert */    { static_cast<int>(ARRAYCOUNT(desertBiomes)),    desertBiomes},
+			/* bgTemperate */ { static_cast<int>(ARRAYCOUNT(temperateBiomes)), temperateBiomes},
+			/* bgMountains */ { static_cast<int>(ARRAYCOUNT(mountainBiomes)),  mountainBiomes},
+			/* bgIce */       { static_cast<int>(ARRAYCOUNT(iceBiomes)),       iceBiomes},
+		};
+
+		static const cBiomesInGroups rareBiomesInGroups[] =
+		{
+			/* bgOcean */     { static_cast<int>(ARRAYCOUNT(rareOceanBiomes)),     rareOceanBiomes},
+			/* bgDesert */    { static_cast<int>(ARRAYCOUNT(rareDesertBiomes)),    rareDesertBiomes},
+			/* bgTemperate */ { static_cast<int>(ARRAYCOUNT(rareTemperateBiomes)), rareTemperateBiomes},
+			/* bgMountains */ { static_cast<int>(ARRAYCOUNT(rareMountainBiomes)),  rareMountainBiomes},
+			/* bgIce */       { static_cast<int>(ARRAYCOUNT(rareIceBiomes)),       rareIceBiomes},
+		};
+
+		// Generate the underlying values, representing biome groups:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+
+		// Overwrite each biome group with a random biome from that group:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int IdxZ = z * SizeX;
+			for (int x = 0; x < SizeX; x++)
+			{
+				int val = a_Values[x + IdxZ];
+				const cBiomesInGroups & Biomes = (val > bgfRare) ?
+					rareBiomesInGroups[(val & (bgfRare - 1)) % ARRAYCOUNT(rareBiomesInGroups)] :
+					biomesInGroups[val % ARRAYCOUNT(biomesInGroups)];
+				int rnd = (super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7);
+				a_Values[x + IdxZ] = Biomes.Biomes[rnd % Biomes.Count];
+			}
+		}
+	}
+
+protected:
+
+	struct cBiomesInGroups
+	{
+		const int Count;
+		const int * Biomes;
+	};
+
+
+	/** The underlying int generator */
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Randomly replaces pixels of one value to another value, using the given chance. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenReplaceRandomly :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenReplaceRandomly(int a_From, int a_To, int a_Chance, int a_Seed, Underlying a_Underlying) :
+		super(a_Seed),
+		m_From(a_From),
+		m_To(a_To),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying values:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+
+		// Replace some of the values:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int idxZ = z * SizeX;
+			for (int x = 0; x < SizeX; x++)
+			{
+				int idx = x + idxZ;
+				if (a_Values[idx] == m_From)
+				{
+					int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+					if (rnd % 1000 < m_Chance)
+					{
+						a_Values[idx] = m_To;
+					}
+				}
+			}
+		}  // for z
+	}
+
+
+protected:
+	/** The original value to be replaced. */
+	int m_From;
+
+	/** The destination value to which to replace. */
+	int m_To;
+
+	/** Chance, in permille, of replacing the value. */
+	int m_Chance;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Mixer that joins together finalized biomes and rivers.
+It first checks for oceans, if there is an ocean in the Biomes, it keeps the ocean.
+If there's no ocean, it checks Rivers for a river, if there is a river, it uses the Biomes to select either
+regular river or frozen river, based on the biome. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenMixRivers:
+	public cIntGen<SizeX, SizeZ>
+{
+	typedef cIntGen<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenMixRivers(Underlying a_Biomes, Underlying a_Rivers):
+		m_Biomes(a_Biomes),
+		m_Rivers(a_Rivers)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data:
+		m_Biomes->GetInts(a_MinX, a_MinZ, a_Values);
+		typename super::Values riverData;
+		m_Rivers->GetInts(a_MinX, a_MinZ, riverData);
+
+		// Mix the values:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			int idxZ = z * SizeX;
+			for (int x = 0; x < SizeX; x++)
+			{
+				int idx = x + idxZ;
+				if (IsBiomeOcean(a_Values[idx]))
+				{
+					// Oceans are kept without any changes
+					continue;
+				}
+				if (riverData[idx] != biRiver)
+				{
+					// There's no river, keep the current value
+					continue;
+				}
+
+				// There's a river, change the output to a river or a frozen river, based on the original biome:
+				if (IsBiomeVeryCold((EMCSBiome)a_Values[idx]))
+				{
+					a_Values[idx] = biFrozenRiver;
+				}
+				else
+				{
+					a_Values[idx] = biRiver;
+				}
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Biomes;
+	Underlying m_Rivers;
+};
+
+
+
+
+
+/** Generates a river based on the underlying data.
+This is basically an edge detector over the underlying data. The rivers are the edges where the underlying data
+changes from one pixel to its neighbor. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenRiver:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+	static const int UnderlyingSizeX = SizeX + 2;
+	static const int UnderlyingSizeZ = SizeZ + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<UnderlyingSizeX, UnderlyingSizeZ>> Underlying;
+
+
+	cIntGenRiver(int a_Seed, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data:
+		int Cache[UnderlyingSizeX * UnderlyingSizeZ];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, Cache);
+
+		// Detect the edges:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int Above = Cache[x + 1 + z * UnderlyingSizeX];
+				int Below = Cache[x + 1 + (z + 2) * UnderlyingSizeX];
+				int Left  = Cache[x +     (z + 1) * UnderlyingSizeX];
+				int Right = Cache[x + 2 + (z + 1) * UnderlyingSizeX];
+				int val   = Cache[x + 1 + (z + 1) * UnderlyingSizeX];
+
+				if ((val == Above) && (val == Below) && (val == Left) && (val == Right))
+				{
+					val = 0;
+				}
+				else
+				{
+					val = biRiver;
+				}
+				a_Values[x + z * SizeX] = val;
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Turns some of the oceans into the specified biome. Used for mushroom and deep ocean.
+The biome is only placed if at least 3 of its neighbors are ocean and only with the specified chance. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenAddToOcean:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+	static const int UnderlyingSizeX = SizeX + 2;
+	static const int UnderlyingSizeZ = SizeZ + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<UnderlyingSizeX, UnderlyingSizeZ>> Underlying;
+
+
+	cIntGenAddToOcean(int a_Seed, int a_Chance, int a_ToValue, Underlying a_Underlying):
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_ToValue(a_ToValue),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data:
+		int Cache[UnderlyingSizeX * UnderlyingSizeZ];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, Cache);
+
+		// Add the mushroom islands:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int val = Cache[x + 1 + (z + 1) * UnderlyingSizeX];
+				if (!IsBiomeOcean(val))
+				{
+					a_Values[x + z * SizeX] = val;
+					continue;
+				}
+
+				// Count the ocean neighbors:
+				int Above = Cache[x + 1 + z * UnderlyingSizeX];
+				int Below = Cache[x + 1 + (z + 2) * UnderlyingSizeX];
+				int Left  = Cache[x +     (z + 1) * UnderlyingSizeX];
+				int Right = Cache[x + 2 + (z + 1) * UnderlyingSizeX];
+				int NumOceanNeighbors = 0;
+				if (IsBiomeOcean(Above))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Below))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Left))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Right))
+				{
+					NumOceanNeighbors += 1;
+				}
+
+				// If at least 3 ocean neighbors and the chance is right, change:
+				if (
+					(NumOceanNeighbors >= 3) &&
+					((super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7) % 1000 < m_Chance)
+				)
+				{
+					a_Values[x + z * SizeX] = m_ToValue;
+				}
+				else
+				{
+					a_Values[x + z * SizeX] = val;
+				}
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	/** Chance, in permille, of changing the biome. */
+	int m_Chance;
+
+	/** The value to change the ocean into. */
+	int m_ToValue;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Changes random pixels of the underlying data to the specified value. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenSetRandomly :
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+	cIntGenSetRandomly(int a_Seed, int a_Chance, int a_ToValue, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_ToValue(a_ToValue),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+
+		// Change random pixels to bgOcean:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+				if (rnd % 1000 < m_Chance)
+				{
+					a_Values[x + z * SizeX] = m_ToValue;
+				}
+			}
+		}
+	}
+
+protected:
+	/** Chance, in permille, of changing each pixel. */
+	int m_Chance;
+
+	/** The value to which to set the pixel. */
+	int m_ToValue;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+
+/** Adds a "rare" flag to random biome groups, based on the given chance. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenRareBiomeGroups:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenRareBiomeGroups(int a_Seed, int a_Chance, Underlying a_Underlying):
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying data:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+
+		// Change some of the biome groups into rare biome groups:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+				if (rnd % 1000 < m_Chance)
+				{
+					int idx = x + SizeX * z;
+					a_Values[idx] = a_Values[idx] | bgfRare;
+				}
+			}
+		}
+	}
+
+protected:
+	/** Chance, in permille, of changing each pixel into the rare biome group. */
+	int m_Chance;
+
+	/** The underlying generator. */
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Changes biomes in the parent data into an alternate versions (usually "hill" variants), in such places
+that have their alterations set. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenAlternateBiomes:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenAlternateBiomes(int a_Seed, Underlying a_Alterations, Underlying a_BaseBiomes):
+		super(a_Seed),
+		m_Alterations(a_Alterations),
+		m_BaseBiomes(a_BaseBiomes)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the base biomes and the alterations:
+		m_BaseBiomes->GetInts(a_MinX, a_MinZ, a_Values);
+		typename super::Values alterations;
+		m_Alterations->GetInts(a_MinX, a_MinZ, alterations);
+
+		// Change the biomes into their alternate versions:
+		for (int idx = 0; idx < SizeX * SizeZ; ++idx)
+		{
+			if (alterations[idx] == 0)
+			{
+				// No change
+				continue;
+			}
+
+			// Change to alternate biomes:
+			int val = a_Values[idx];
+			switch (val)
+			{
+				case biBirchForest:   val = biBirchForestHills; break;
+				case biDesert:        val = biDesertHills;      break;
+				case biExtremeHills:  val = biExtremeHillsPlus; break;
+				case biForest:        val = biForestHills;      break;
+				case biIcePlains:     val = biIceMountains;     break;
+				case biJungle:        val = biJungleHills;      break;
+				case biMegaTaiga:     val = biMegaTaigaHills;   break;
+				case biMesaPlateau:   val = biMesa;             break;
+				case biMesaPlateauF:  val = biMesa;             break;
+				case biMesaPlateauM:  val = biMesa;             break;
+				case biMesaPlateauFM: val = biMesa;             break;
+				case biPlains:        val = biForest;           break;
+				case biRoofedForest:  val = biPlains;           break;
+				case biSavanna:       val = biSavannaPlateau;   break;
+				case biTaiga:         val = biTaigaHills;       break;
+			}
+			a_Values[idx] = val;
+		}  // for idx - a_Values[]
+	}
+
+protected:
+	Underlying m_Alterations;
+	Underlying m_BaseBiomes;
+};
+
+
+
+
+
+/** Adds an edge between two specifically incompatible biomes, such as mesa and forest. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenBiomeEdges:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+	static const int m_LowerSizeX = SizeX + 2;
+	static const int m_LowerSizeZ = SizeZ + 2;
+
+public:
+	typedef std::shared_ptr<cIntGen<m_LowerSizeX, m_LowerSizeZ>> Underlying;
+
+
+	cIntGenBiomeEdges(int a_Seed, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying biomes:
+		typename Underlying::element_type::Values lowerValues;
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerValues);
+
+		// Convert incompatible edges into neutral biomes:
+		for (int z = 0; z < SizeZ; z++)
+		{
+			for (int x = 0; x < SizeX; x++)
+			{
+				int biome = lowerValues[x + 1 + (z + 1) * m_LowerSizeX];
+				int above = lowerValues[x + 1 + z *       m_LowerSizeX];
+				int below = lowerValues[x + 1 + (z + 2) * m_LowerSizeX];
+				int left  = lowerValues[x +     (z + 1) * m_LowerSizeX];
+				int right = lowerValues[x + 2 + (z + 1) * m_LowerSizeX];
+
+				switch (biome)
+				{
+					case biDesert:
+					case biDesertM:
+					case biDesertHills:
+					{
+						if (
+							IsBiomeVeryCold(static_cast<EMCSBiome>(above)) ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(below)) ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(left))  ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(right))
+						)
+						{
+							biome = biPlains;
+						}
+						break;
+					}  // case biDesert
+
+					case biMesaPlateau:
+					case biMesaPlateauF:
+					case biMesaPlateauFM:
+					case biMesaPlateauM:
+					{
+						if (
+							!isMesaCompatible(above) ||
+							!isMesaCompatible(below) ||
+							!isMesaCompatible(left)  ||
+							!isMesaCompatible(right)
+						)
+						{
+							biome = biDesert;
+						}
+						break;
+					}  // Mesa biomes
+
+					case biJungle:
+					case biJungleM:
+					{
+						if (
+							!isJungleCompatible(above) ||
+							!isJungleCompatible(below) ||
+							!isJungleCompatible(left)  ||
+							!isJungleCompatible(right)
+						)
+						{
+							biome = (biome == biJungle) ? biJungleEdge : biJungleEdgeM;
+						}
+						break;
+					}  // Jungle biomes
+
+					case biSwampland:
+					case biSwamplandM:
+					{
+						if (
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(above)) ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(below)) ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(left))  ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(right))
+						)
+						{
+							biome = biPlains;
+						}
+						break;
+					}  // Swampland biomes
+				}  // switch (biome)
+
+				a_Values[x + z * SizeX] = biome;
+			}  // for x
+		}  // for z
+	}
+
+
+protected:
+	Underlying m_Underlying;
+
+
+	bool isMesaCompatible(int a_Biome)
+	{
+		switch (a_Biome)
+		{
+			case biDesert:
+			case biMesa:
+			case biMesaBryce:
+			case biMesaPlateau:
+			case biMesaPlateauF:
+			case biMesaPlateauFM:
+			case biMesaPlateauM:
+			case biOcean:
+			case biDeepOcean:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+
+
+	bool isJungleCompatible(int a_Biome)
+	{
+		switch (a_Biome)
+		{
+			case biJungle:
+			case biJungleM:
+			case biJungleEdge:
+			case biJungleEdgeM:
+			case biJungleHills:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+};
+
+
+
+
+
+/** Changes biomes in the parent data into their alternate versions ("M" variants), in such places that
+have their alterations set. */
+template <int SizeX, int SizeZ = SizeX>
+class cIntGenMBiomes:
+	public cIntGenWithNoise<SizeX, SizeZ>
+{
+	typedef cIntGenWithNoise<SizeX, SizeZ> super;
+
+public:
+	typedef std::shared_ptr<cIntGen<SizeX, SizeZ>> Underlying;
+
+
+	cIntGenMBiomes(int a_Seed, Underlying a_Alteration, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying),
+		m_Alteration(a_Alteration)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, typename super::Values & a_Values) override
+	{
+		// Generate the underlying biomes and the alterations:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_Values);
+		typename super::Values alterations;
+		m_Alteration->GetInts(a_MinX, a_MinZ, alterations);
+
+		// Wherever alterations are nonzero, change into alternate biome, if available:
+		for (int idx = 0; idx < SizeX * SizeZ; ++idx)
+		{
+			if (alterations[idx] == 0)
+			{
+				continue;
+			}
+
+			// Ice spikes biome was removed from here, because it was generated way too often
+			switch (a_Values[idx])
+			{
+				case biPlains:               a_Values[idx] = biSunflowerPlains;      break;
+				case biDesert:               a_Values[idx] = biDesertM;              break;
+				case biExtremeHills:         a_Values[idx] = biExtremeHillsM;        break;
+				case biForest:               a_Values[idx] = biFlowerForest;         break;
+				case biTaiga:                a_Values[idx] = biTaigaM;               break;
+				case biSwampland:            a_Values[idx] = biSwamplandM;           break;
+				case biJungle:               a_Values[idx] = biJungleM;              break;
+				case biJungleEdge:           a_Values[idx] = biJungleEdgeM;          break;
+				case biBirchForest:          a_Values[idx] = biBirchForestM;         break;
+				case biBirchForestHills:     a_Values[idx] = biBirchForestHillsM;    break;
+				case biRoofedForest:         a_Values[idx] = biRoofedForestM;        break;
+				case biColdTaiga:            a_Values[idx] = biColdTaigaM;           break;
+				case biMegaSpruceTaiga:      a_Values[idx] = biMegaSpruceTaiga;      break;
+				case biMegaSpruceTaigaHills: a_Values[idx] = biMegaSpruceTaigaHills; break;
+				case biExtremeHillsPlus:     a_Values[idx] = biExtremeHillsPlusM;    break;
+				case biSavanna:              a_Values[idx] = biSavannaM;             break;
+				case biSavannaPlateau:       a_Values[idx] = biSavannaPlateauM;      break;
+				case biMesa:                 a_Values[idx] = biMesaBryce;            break;
+				case biMesaPlateauF:         a_Values[idx] = biMesaPlateauFM;        break;
+				case biMesaPlateau:          a_Values[idx] = biMesaBryce;            break;
+			}
+		}  // for idx - a_Values[] / alterations[]
+	}
+
+protected:
+	Underlying m_Underlying;
+	Underlying m_Alteration;
+};
+
+
+
+
diff --git a/src/Generating/MineShafts.cpp b/src/Generating/MineShafts.cpp
index 0532aff39..55b3b64dd 100644
--- a/src/Generating/MineShafts.cpp
+++ b/src/Generating/MineShafts.cpp
@@ -112,7 +112,7 @@ class cMineShaftCorridor :
 public:
 	/** Creates a new Corridor attached to the specified pivot point and direction.
 	Checks all ParentSystem's objects and disallows intersecting. Initializes the new object to fit.
-	May return NULL if cannot fit.
+	May return nullptr if cannot fit.
 	*/
 	static cMineShaft * CreateAndFit(
 		cStructGenMineShafts::cMineShaftSystem & a_ParentSystem,
@@ -165,7 +165,7 @@ class cMineShaftCrossing :
 public:
 	/** Creates a new Crossing attached to the specified pivot point and direction.
 	Checks all ParentSystem's objects and disallows intersecting. Initializes the new object to fit.
-	May return NULL if cannot fit.
+	May return nullptr if cannot fit.
 	*/
 	static cMineShaft * CreateAndFit(
 		cStructGenMineShafts::cMineShaftSystem & a_ParentSystem,
@@ -199,7 +199,7 @@ public:
 
 	/** Creates a new Staircase attached to the specified pivot point and direction.
 	Checks all ParentSystem's objects and disallows intersecting. Initializes the new object to fit.
-	May return NULL if cannot fit.
+	May return nullptr if cannot fit.
 	*/
 	static cMineShaft * CreateAndFit(
 		cStructGenMineShafts::cMineShaftSystem & a_ParentSystem,
@@ -351,7 +351,7 @@ void cStructGenMineShafts::cMineShaftSystem::AppendBranch(
 		return;
 	}
 
-	cMineShaft * Next = NULL;
+	cMineShaft * Next = nullptr;
 	int rnd = (a_Noise.IntNoise3DInt(a_PivotX, a_PivotY + a_RecursionLevel * 16, a_PivotZ) / 13) % m_ProbLevelStaircase;
 	if (rnd < m_ProbLevelCorridor)
 	{
@@ -365,7 +365,7 @@ void cStructGenMineShafts::cMineShaftSystem::AppendBranch(
 	{
 		Next = cMineShaftStaircase::CreateAndFit(*this, a_PivotX, a_PivotY, a_PivotZ, a_Direction, a_Noise);
 	}
-	if (Next == NULL)
+	if (Next == nullptr)
 	{
 		return;
 	}
@@ -552,7 +552,7 @@ cMineShaft * cMineShaftCorridor::CreateAndFit(
 	}
 	if (!a_ParentSystem.CanAppend(BoundingBox))
 	{
-		return NULL;
+		return nullptr;
 	}
 	return new cMineShaftCorridor(a_ParentSystem, BoundingBox, NumSegments, a_Direction, a_Noise);
 }
@@ -796,7 +796,7 @@ void cMineShaftCorridor::PlaceChest(cChunkDesc & a_ChunkDesc)
 	{
 		a_ChunkDesc.SetBlockTypeMeta(x, m_BoundingBox.p1.y + 1, z, E_BLOCK_CHEST, Meta);
 		cChestEntity * ChestEntity = (cChestEntity *)a_ChunkDesc.GetBlockEntity(x, m_BoundingBox.p1.y + 1, z);
-		ASSERT((ChestEntity != NULL) && (ChestEntity->GetBlockType() == E_BLOCK_CHEST));
+		ASSERT((ChestEntity != nullptr) && (ChestEntity->GetBlockType() == E_BLOCK_CHEST));
 		cNoise Noise(a_ChunkDesc.GetChunkX() ^ a_ChunkDesc.GetChunkZ());
 		int NumSlots = 3 + ((Noise.IntNoise3DInt(x, m_BoundingBox.p1.y, z) / 11) % 4);
 		int Seed = Noise.IntNoise2DInt(x, z);
@@ -1006,7 +1006,7 @@ cMineShaft * cMineShaftCrossing::CreateAndFit(
 	}
 	if (!a_ParentSystem.CanAppend(BoundingBox))
 	{
-		return NULL;
+		return nullptr;
 	}
 	return new cMineShaftCrossing(a_ParentSystem, BoundingBox);
 }
@@ -1157,7 +1157,7 @@ cMineShaft * cMineShaftStaircase::CreateAndFit(
 	}
 	if (!a_ParentSystem.CanAppend(Box))
 	{
-		return NULL;
+		return nullptr;
 	}
 	return new cMineShaftStaircase(a_ParentSystem, Box, a_Direction, Slope);
 }
diff --git a/src/Generating/Noise3DGenerator.cpp b/src/Generating/Noise3DGenerator.cpp
index c3ca30384..f2af75999 100644
--- a/src/Generating/Noise3DGenerator.cpp
+++ b/src/Generating/Noise3DGenerator.cpp
@@ -6,7 +6,7 @@
 #include "Globals.h"
 #include "Noise3DGenerator.h"
 #include "../OSSupport/File.h"
-#include "inifile/iniFile.h"
+#include "../IniFile.h"
 #include "../LinearInterpolation.h"
 #include "../LinearUpscale.h"
 
@@ -61,6 +61,35 @@ public:
 
 
 
+/** Linearly interpolates between two values.
+Assumes that a_Ratio is in range [0, 1]. */
+inline static NOISE_DATATYPE Lerp(NOISE_DATATYPE a_Val1, NOISE_DATATYPE a_Val2, NOISE_DATATYPE a_Ratio)
+{
+	return a_Val1 + (a_Val2 - a_Val1) * a_Ratio;
+}
+
+
+
+
+
+/** Linearly interpolates between two values, clamping the ratio to [0, 1] first. */
+inline static NOISE_DATATYPE ClampedLerp(NOISE_DATATYPE a_Val1, NOISE_DATATYPE a_Val2, NOISE_DATATYPE a_Ratio)
+{
+	if (a_Ratio < 0)
+	{
+		return a_Val1;
+	}
+	if (a_Ratio > 1)
+	{
+		return a_Val2;
+	}
+	return Lerp(a_Val1, a_Val2, a_Ratio);
+}
+
+
+
+
+
 ////////////////////////////////////////////////////////////////////////////////
 // cNoise3DGenerator:
 
@@ -346,9 +375,10 @@ void cNoise3DGenerator::ComposeTerrain(cChunkDesc & a_ChunkDesc)
 // cNoise3DComposable:
 
 cNoise3DComposable::cNoise3DComposable(int a_Seed) :
-	m_Noise1(a_Seed + 1000),
-	m_Noise2(a_Seed + 2000),
-	m_Noise3(a_Seed + 3000)
+	m_ChoiceNoise(a_Seed),
+	m_DensityNoiseA(a_Seed + 1),
+	m_DensityNoiseB(a_Seed + 2),
+	m_BaseNoise(a_Seed + 3)
 {
 }
 
@@ -359,13 +389,51 @@ cNoise3DComposable::cNoise3DComposable(int a_Seed) :
 void cNoise3DComposable::Initialize(cIniFile & a_IniFile)
 {
 	// Params:
+	// The defaults generate extreme hills terrain
 	m_SeaLevel            =                 a_IniFile.GetValueSetI("Generator", "Noise3DSeaLevel", 62);
-	m_HeightAmplification = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DHeightAmplification", 0);
+	m_HeightAmplification = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DHeightAmplification", 0.045);
 	m_MidPoint            = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DMidPoint", 75);
-	m_FrequencyX          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyX", 10);
-	m_FrequencyY          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyY", 10);
-	m_FrequencyZ          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyZ", 10);
-	m_AirThreshold        = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DAirThreshold", 0.5);
+	m_FrequencyX          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyX", 40);
+	m_FrequencyY          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyY", 40);
+	m_FrequencyZ          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DFrequencyZ", 40);
+	m_BaseFrequencyX      = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DBaseFrequencyX", 40);
+	m_BaseFrequencyZ      = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DBaseFrequencyZ", 40);
+	m_ChoiceFrequencyX    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DChoiceFrequencyX", 40);
+	m_ChoiceFrequencyY    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DChoiceFrequencyY", 80);
+	m_ChoiceFrequencyZ    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DChoiceFrequencyZ", 40);
+	m_AirThreshold        = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DAirThreshold", 0);
+	int NumChoiceOctaves  = a_IniFile.GetValueSetI("Generator", "Noise3DNumChoiceOctaves",  4);
+	int NumDensityOctaves = a_IniFile.GetValueSetI("Generator", "Noise3DNumDensityOctaves", 6);
+	int NumBaseOctaves    = a_IniFile.GetValueSetI("Generator", "Noise3DNumBaseOctaves",    6);
+	NOISE_DATATYPE BaseNoiseAmplitude = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "Noise3DBaseAmplitude", 1);
+
+	// Add octaves for the choice noise:
+	NOISE_DATATYPE wavlen = 1, ampl = 0.5;
+	for (int i = 0; i < NumChoiceOctaves; i++)
+	{
+		m_ChoiceNoise.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
+
+	// Add octaves for the density noises:
+	wavlen = 1, ampl = 1;
+	for (int i = 0; i < NumDensityOctaves; i++)
+	{
+		m_DensityNoiseA.AddOctave(wavlen, ampl);
+		m_DensityNoiseB.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
+
+	// Add octaves for the base noise:
+	wavlen = 1, ampl = BaseNoiseAmplitude;
+	for (int i = 0; i < NumBaseOctaves; i++)
+	{
+		m_BaseNoise.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
 }
 
 
@@ -376,126 +444,399 @@ void cNoise3DComposable::GenerateNoiseArrayIfNeeded(int a_ChunkX, int a_ChunkZ)
 {
 	if ((a_ChunkX == m_LastChunkX) && (a_ChunkZ == m_LastChunkZ))
 	{
-		// The noise for this chunk is already generated in m_Noise
+		// The noise for this chunk is already generated in m_NoiseArray
 		return;
 	}
 	m_LastChunkX = a_ChunkX;
 	m_LastChunkZ = a_ChunkZ;
 
-	// Upscaling parameters:
-	const int UPSCALE_X = 8;
-	const int UPSCALE_Y = 4;
-	const int UPSCALE_Z = 8;
-
-	// Precalculate a "height" array:
-	NOISE_DATATYPE Height[17 * 17];  // x + 17 * z
-	for (int z = 0; z < 17; z += UPSCALE_Z)
+	// Generate all the noises:
+	NOISE_DATATYPE ChoiceNoise[5 * 5 * 33];
+	NOISE_DATATYPE Workspace[5 * 5 * 33];
+	NOISE_DATATYPE DensityNoiseA[5 * 5 * 33];
+	NOISE_DATATYPE DensityNoiseB[5 * 5 * 33];
+	NOISE_DATATYPE BaseNoise[5 * 5];
+	NOISE_DATATYPE BlockX = static_cast<NOISE_DATATYPE>(a_ChunkX * cChunkDef::Width);
+	NOISE_DATATYPE BlockZ = static_cast<NOISE_DATATYPE>(a_ChunkZ * cChunkDef::Width);
+	// Note that we have to swap the coords, because noise generator uses [x + SizeX * y + SizeX * SizeY * z] ordering and we want "BlockY" to be "z":
+	m_ChoiceNoise.Generate3D  (ChoiceNoise,   5, 5, 33, BlockX / m_ChoiceFrequencyX, (BlockX + 17) / m_ChoiceFrequencyX, BlockZ / m_ChoiceFrequencyZ, (BlockZ + 17) / m_ChoiceFrequencyZ, 0, 257 / m_ChoiceFrequencyY, Workspace);
+	m_DensityNoiseA.Generate3D(DensityNoiseA, 5, 5, 33, BlockX / m_FrequencyX,       (BlockX + 17) / m_FrequencyX,       BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ,       0, 257 / m_FrequencyY,       Workspace);
+	m_DensityNoiseB.Generate3D(DensityNoiseB, 5, 5, 33, BlockX / m_FrequencyX,       (BlockX + 17) / m_FrequencyX,       BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ,       0, 257 / m_FrequencyY,       Workspace);
+	m_BaseNoise.Generate2D    (BaseNoise,     5, 5,     BlockX / m_BaseFrequencyX,   (BlockX + 17) / m_BaseFrequencyX,   BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ, Workspace);
+
+	// Calculate the final noise based on the partial noises:
+	for (int y = 0; y < 33; y++)
 	{
-		NOISE_DATATYPE NoiseZ = ((NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width + z)) / m_FrequencyZ;
-		for (int x = 0; x < 17; x += UPSCALE_X)
+		NOISE_DATATYPE AddHeight = (static_cast<NOISE_DATATYPE>(y * 8) - m_MidPoint) * m_HeightAmplification;
+
+		// If "underground", make the terrain smoother by forcing the vertical linear gradient into steeper slope:
+		if (AddHeight < 0)
 		{
-			NOISE_DATATYPE NoiseX = ((NOISE_DATATYPE)(a_ChunkX * cChunkDef::Width + x)) / m_FrequencyX;
-			NOISE_DATATYPE val = std::abs(m_Noise1.CubicNoise2D(NoiseX / 5, NoiseZ / 5)) * m_HeightAmplification + 1;
-			Height[x + 17 * z] = val * val * val;
+			AddHeight *= 4;
 		}
-	}
 
-	for (int y = 0; y < 257; y += UPSCALE_Y)
-	{
-		NOISE_DATATYPE NoiseY = ((NOISE_DATATYPE)y) / m_FrequencyY;
-		NOISE_DATATYPE AddHeight = (y - m_MidPoint) / 20;
-		AddHeight *= AddHeight * AddHeight;
-		NOISE_DATATYPE * CurFloor = &(m_NoiseArray[y * 17 * 17]);
-		for (int z = 0; z < 17; z += UPSCALE_Z)
+		for (int z = 0; z < 5; z++)
 		{
-			NOISE_DATATYPE NoiseZ = ((NOISE_DATATYPE)(a_ChunkZ * cChunkDef::Width + z)) / m_FrequencyZ;
-			for (int x = 0; x < 17; x += UPSCALE_X)
+			for (int x = 0; x < 5; x++)
 			{
-				NOISE_DATATYPE NoiseX = ((NOISE_DATATYPE)(a_ChunkX * cChunkDef::Width + x)) / m_FrequencyX;
-				CurFloor[x + 17 * z] = (
-					m_Noise1.CubicNoise3D(NoiseX, NoiseY, NoiseZ) * (NOISE_DATATYPE)0.5 +
-					m_Noise2.CubicNoise3D(NoiseX / 2, NoiseY / 2, NoiseZ / 2) +
-					m_Noise3.CubicNoise3D(NoiseX / 4, NoiseY / 4, NoiseZ / 4) * 2 +
-					AddHeight / Height[x + 17 * z]
-				);
+				int idx = x + 5 * z + 5 * 5 * y;
+				Workspace[idx] = ClampedLerp(DensityNoiseA[idx], DensityNoiseB[idx], 8 * (ChoiceNoise[idx] + 0.5f)) + AddHeight + BaseNoise[x + 5 * z];
 			}
 		}
-		// Linear-interpolate this XZ floor:
-		LinearUpscale2DArrayInPlace<17, 17, UPSCALE_X, UPSCALE_Z>(CurFloor);
 	}
+	LinearUpscale3DArray<NOISE_DATATYPE>(Workspace, 5, 5, 33, m_NoiseArray, 4, 4, 8);
+}
+
+
 
-	// Finish the 3D linear interpolation by interpolating between each XZ-floors on the Y axis
-	for (int y = 1; y < cChunkDef::Height; y++)
+
+
+void cNoise3DComposable::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+{
+	GenerateNoiseArrayIfNeeded(a_ChunkX, a_ChunkZ);
+
+	for (int z = 0; z < cChunkDef::Width; z++)
 	{
-		if ((y % UPSCALE_Y) == 0)
+		for (int x = 0; x < cChunkDef::Width; x++)
 		{
-			// This is the interpolation source floor, already calculated
-			continue;
-		}
-		int LoFloorY = (y / UPSCALE_Y) * UPSCALE_Y;
-		int HiFloorY = LoFloorY + UPSCALE_Y;
-		NOISE_DATATYPE * LoFloor  = &(m_NoiseArray[LoFloorY * 17 * 17]);
-		NOISE_DATATYPE * HiFloor  = &(m_NoiseArray[HiFloorY * 17 * 17]);
-		NOISE_DATATYPE * CurFloor = &(m_NoiseArray[y * 17 * 17]);
-		NOISE_DATATYPE Ratio = ((NOISE_DATATYPE)(y % UPSCALE_Y)) / UPSCALE_Y;
-		int idx = 0;
-		for (int z = 0; z < cChunkDef::Width; z++)
+			cChunkDef::SetHeight(a_HeightMap, x, z, m_SeaLevel);
+			for (int y = cChunkDef::Height - 1; y > m_SeaLevel; y--)
+			{
+				if (m_NoiseArray[y * 17 * 17 + z * 17 + x] <= m_AirThreshold)
+				{
+					cChunkDef::SetHeight(a_HeightMap, x, z, y);
+					break;
+				}
+			}  // for y
+		}  // for x
+	}  // for z
+}
+
+
+
+
+
+void cNoise3DComposable::ComposeTerrain(cChunkDesc & a_ChunkDesc)
+{
+	GenerateNoiseArrayIfNeeded(a_ChunkDesc.GetChunkX(), a_ChunkDesc.GetChunkZ());
+
+	a_ChunkDesc.FillBlocks(E_BLOCK_AIR, 0);
+
+	// Make basic terrain composition:
+	for (int z = 0; z < cChunkDef::Width; z++)
+	{
+		for (int x = 0; x < cChunkDef::Width; x++)
 		{
-			for (int x = 0; x < cChunkDef::Width; x++)
+			int LastAir = a_ChunkDesc.GetHeight(x, z) + 1;
+			bool HasHadWater = false;
+			for (int y = LastAir; y < m_SeaLevel; y++)
 			{
-				CurFloor[idx] = LoFloor[idx] + (HiFloor[idx] - LoFloor[idx]) * Ratio;
-				idx += 1;
+				a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_STATIONARY_WATER);
 			}
-			idx += 1;  // Skipping one X column
+			for (int y = LastAir - 1; y > 0; y--)
+			{
+				if (m_NoiseArray[x + 17 * z + 17 * 17 * y] > m_AirThreshold)
+				{
+					// "air" part
+					LastAir = y;
+					if (y < m_SeaLevel)
+					{
+						a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_STATIONARY_WATER);
+						HasHadWater = true;
+					}
+					continue;
+				}
+				// "ground" part:
+				if (LastAir - y > 4)
+				{
+					a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_STONE);
+					continue;
+				}
+				if (HasHadWater)
+				{
+					a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_SAND);
+				}
+				else
+				{
+					a_ChunkDesc.SetBlockType(x, y, z, (LastAir == y + 1) ? E_BLOCK_GRASS : E_BLOCK_DIRT);
+				}
+			}  // for y
+			a_ChunkDesc.SetBlockType(x, 0, z, E_BLOCK_BEDROCK);
+		}  // for x
+	}  // for z
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cBiomalNoise3DComposable:
+
+cBiomalNoise3DComposable::cBiomalNoise3DComposable(int a_Seed, cBiomeGenPtr a_BiomeGen) :
+	m_ChoiceNoise(a_Seed),
+	m_DensityNoiseA(a_Seed + 1),
+	m_DensityNoiseB(a_Seed + 2),
+	m_BaseNoise(a_Seed + 3),
+	m_BiomeGen(a_BiomeGen)
+{
+	// Generate the weight distribution for summing up neighboring biomes:
+	m_WeightSum = 0;
+	for (int z = 0; z <= AVERAGING_SIZE * 2; z++)
+	{
+		for (int x = 0; x <= AVERAGING_SIZE * 2; x++)
+		{
+			m_Weight[z][x] = static_cast<NOISE_DATATYPE>((5 - std::abs(5 - x)) + (5 - std::abs(5 - z)));
+			m_WeightSum += m_Weight[z][x];
 		}
 	}
+}
+
+
+
+
+
+void cBiomalNoise3DComposable::Initialize(cIniFile & a_IniFile)
+{
+	// Params:
+	// The defaults generate extreme hills terrain
+	m_SeaLevel            =                 a_IniFile.GetValueSetI("Generator", "BiomalNoise3DSeaLevel", 62);
+	m_FrequencyX          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DFrequencyX", 40);
+	m_FrequencyY          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DFrequencyY", 40);
+	m_FrequencyZ          = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DFrequencyZ", 40);
+	m_BaseFrequencyX      = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DBaseFrequencyX", 40);
+	m_BaseFrequencyZ      = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DBaseFrequencyZ", 40);
+	m_ChoiceFrequencyX    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DChoiceFrequencyX", 40);
+	m_ChoiceFrequencyY    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DChoiceFrequencyY", 80);
+	m_ChoiceFrequencyZ    = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DChoiceFrequencyZ", 40);
+	m_AirThreshold        = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DAirThreshold", 0);
+	int NumChoiceOctaves  = a_IniFile.GetValueSetI("Generator", "BiomalNoise3DNumChoiceOctaves",  4);
+	int NumDensityOctaves = a_IniFile.GetValueSetI("Generator", "BiomalNoise3DNumDensityOctaves", 6);
+	int NumBaseOctaves    = a_IniFile.GetValueSetI("Generator", "BiomalNoise3DNumBaseOctaves",    6);
+	NOISE_DATATYPE BaseNoiseAmplitude = (NOISE_DATATYPE)a_IniFile.GetValueSetF("Generator", "BiomalNoise3DBaseAmplitude", 1);
+
+	// Add octaves for the choice noise:
+	NOISE_DATATYPE wavlen = 1, ampl = 0.5;
+	for (int i = 0; i < NumChoiceOctaves; i++)
+	{
+		m_ChoiceNoise.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
 
-	// The noise array is now fully interpolated
-	/*
-	// DEBUG: Output two images of the array, sliced by XY and XZ:
-	cFile f1;
-	if (f1.Open(Printf("Chunk_%d_%d_XY.raw", a_ChunkX, a_ChunkZ), cFile::fmWrite))
+	// Add octaves for the density noises:
+	wavlen = 1, ampl = 1;
+	for (int i = 0; i < NumDensityOctaves; i++)
 	{
-		for (int z = 0; z < cChunkDef::Width; z++)
+		m_DensityNoiseA.AddOctave(wavlen, ampl);
+		m_DensityNoiseB.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
+
+	// Add octaves for the base noise:
+	wavlen = 1, ampl = BaseNoiseAmplitude;
+	for (int i = 0; i < NumBaseOctaves; i++)
+	{
+		m_BaseNoise.AddOctave(wavlen, ampl);
+		wavlen = wavlen * 2;
+		ampl = ampl / 2;
+	}
+}
+
+
+
+
+
+void cBiomalNoise3DComposable::GenerateNoiseArrayIfNeeded(int a_ChunkX, int a_ChunkZ)
+{
+	if ((a_ChunkX == m_LastChunkX) && (a_ChunkZ == m_LastChunkZ))
+	{
+		// The noise for this chunk is already generated in m_NoiseArray
+		return;
+	}
+	m_LastChunkX = a_ChunkX;
+	m_LastChunkZ = a_ChunkZ;
+
+	// Calculate the parameters for the biomes:
+	ChunkParam MidPoint;
+	ChunkParam HeightAmp;
+	CalcBiomeParamArrays(a_ChunkX, a_ChunkZ, HeightAmp, MidPoint);
+
+	// Generate all the noises:
+	NOISE_DATATYPE ChoiceNoise[5 * 5 * 33];
+	NOISE_DATATYPE Workspace[5 * 5 * 33];
+	NOISE_DATATYPE DensityNoiseA[5 * 5 * 33];
+	NOISE_DATATYPE DensityNoiseB[5 * 5 * 33];
+	NOISE_DATATYPE BaseNoise[5 * 5];
+	NOISE_DATATYPE BlockX = static_cast<NOISE_DATATYPE>(a_ChunkX * cChunkDef::Width);
+	NOISE_DATATYPE BlockZ = static_cast<NOISE_DATATYPE>(a_ChunkZ * cChunkDef::Width);
+	// Note that we have to swap the coords, because noise generator uses [x + SizeX * y + SizeX * SizeY * z] ordering and we want "BlockY" to be "z":
+	m_ChoiceNoise.Generate3D  (ChoiceNoise,   5, 5, 33, BlockX / m_ChoiceFrequencyX, (BlockX + 17) / m_ChoiceFrequencyX, BlockZ / m_ChoiceFrequencyZ, (BlockZ + 17) / m_ChoiceFrequencyZ, 0, 257 / m_ChoiceFrequencyY, Workspace);
+	m_DensityNoiseA.Generate3D(DensityNoiseA, 5, 5, 33, BlockX / m_FrequencyX,       (BlockX + 17) / m_FrequencyX,       BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ,       0, 257 / m_FrequencyY,       Workspace);
+	m_DensityNoiseB.Generate3D(DensityNoiseB, 5, 5, 33, BlockX / m_FrequencyX,       (BlockX + 17) / m_FrequencyX,       BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ,       0, 257 / m_FrequencyY,       Workspace);
+	m_BaseNoise.Generate2D    (BaseNoise,     5, 5,     BlockX / m_BaseFrequencyX,   (BlockX + 17) / m_BaseFrequencyX,   BlockZ / m_FrequencyZ,       (BlockZ + 17) / m_FrequencyZ, Workspace);
+
+	// Calculate the final noise based on the partial noises:
+	for (int y = 0; y < 33; y++)
+	{
+		NOISE_DATATYPE BlockHeight = static_cast<NOISE_DATATYPE>(y * 8);
+		for (int z = 0; z < 5; z++)
 		{
-			for (int y = 0; y < cChunkDef::Height; y++)
+			for (int x = 0; x < 5; x++)
 			{
-				int idx = y * 17 * 17 + z * 17;
-				unsigned char buf[16];
-				for (int x = 0; x < cChunkDef::Width; x++)
+				NOISE_DATATYPE AddHeight = (BlockHeight - MidPoint[x + 5 * z]) * HeightAmp[x + 5 * z];
+
+				// If "underground", make the terrain smoother by forcing the vertical linear gradient into steeper slope:
+				if (AddHeight < 0)
 				{
-					buf[x] = (unsigned char)(std::min(256, std::max(0, (int)(128 + 128 * m_Noise[idx++]))));
+					AddHeight *= 4;
 				}
-				f1.Write(buf, 16);
-			}  // for y
-		}  // for z
-	}  // if (XY file open)
 
-	cFile f2;
-	if (f2.Open(Printf("Chunk_%d_%d_XZ.raw", a_ChunkX, a_ChunkZ), cFile::fmWrite))
+				int idx = x + 5 * z + 5 * 5 * y;
+				Workspace[idx] = ClampedLerp(DensityNoiseA[idx], DensityNoiseB[idx], 8 * (ChoiceNoise[idx] + 0.5f)) + AddHeight + BaseNoise[x + 5 * z];
+			}
+		}
+	}
+	LinearUpscale3DArray<NOISE_DATATYPE>(Workspace, 5, 5, 33, m_NoiseArray, 4, 4, 8);
+}
+
+
+
+
+
+void cBiomalNoise3DComposable::CalcBiomeParamArrays(int a_ChunkX, int a_ChunkZ, ChunkParam & a_HeightAmp, ChunkParam & a_MidPoint)
+{
+	// Generate the 3*3 chunks of biomes around this chunk:
+	cChunkDef::BiomeMap neighborBiomes[3 * 3];
+	for (int z = 0; z < 3; z++)
 	{
-		for (int y = 0; y < cChunkDef::Height; y++)
+		for (int x = 0; x < 3; x++)
 		{
-			for (int z = 0; z < cChunkDef::Width; z++)
+			m_BiomeGen->GenBiomes(a_ChunkX + x - 1, a_ChunkZ + z - 1, neighborBiomes[x + 3 * z]);
+		}
+	}
+
+	// Sum up the biome values:
+	for (int z = 0; z < 5; z++)
+	{
+		for (int x = 0; x < 5; x++)
+		{
+			NOISE_DATATYPE totalHeightAmp = 0;
+			NOISE_DATATYPE totalMidPoint = 0;
+			// Add up the biomes around this point:
+			for (int relz = 0; relz <= AVERAGING_SIZE * 2; ++relz)
 			{
-				int idx = y * 17 * 17 + z * 17;
-				unsigned char buf[16];
-				for (int x = 0; x < cChunkDef::Width; x++)
+				int colz = 16 + z * 4 + relz - AVERAGING_SIZE;   // Biome Z coord relative to the neighborBiomes start
+				int neicellz = colz / 16;	                       // Chunk Z coord relative to the neighborBiomes start
+				int neirelz  = colz % 16;	                       // Biome Z coord relative to cz in neighborBiomes
+				for (int relx = 0; relx <= AVERAGING_SIZE * 2; ++relx)
 				{
-					buf[x] = (unsigned char)(std::min(256, std::max(0, (int)(128 + 128 * m_Noise[idx++]))));
-				}
-				f2.Write(buf, 16);
-			}  // for z
-		}  // for y
-	}  // if (XZ file open)
-	*/
+					int colx = 16 + x * 4 + relx - AVERAGING_SIZE;   // Biome X coord relative to the neighborBiomes start
+					int neicellx = colx / 16;	                       // Chunk X coord relative to the neighborBiomes start
+					int neirelx  = colx % 16;	                       // Biome X coord relative to cz in neighborBiomes
+					EMCSBiome biome = cChunkDef::GetBiome(neighborBiomes[neicellx + neicellz * 3], neirelx, neirelz);
+					NOISE_DATATYPE heightAmp, midPoint;
+					GetBiomeParams(biome, heightAmp, midPoint);
+					totalHeightAmp += heightAmp * m_Weight[relz][relx];
+					totalMidPoint += midPoint * m_Weight[relz][relx];
+				}  // for relx
+			}  // for relz
+			a_HeightAmp[x + 5 * z] = totalHeightAmp / m_WeightSum;
+			a_MidPoint[x + 5 * z] = totalMidPoint / m_WeightSum;
+		}  // for x
+	}  // for z
 }
 
 
 
 
 
-void cNoise3DComposable::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
+void cBiomalNoise3DComposable::GetBiomeParams(EMCSBiome a_Biome, NOISE_DATATYPE & a_HeightAmp, NOISE_DATATYPE & a_MidPoint)
+{
+	switch (a_Biome)
+	{
+		case biBeach:                a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biBirchForest:          a_HeightAmp = 0.1f;   a_MidPoint = 64; break;
+		case biBirchForestHills:     a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biBirchForestHillsM:    a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biBirchForestM:         a_HeightAmp = 0.1f;   a_MidPoint = 64; break;
+		case biColdBeach:            a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biDesertHills:          a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biDeepOcean:            a_HeightAmp = 0.17f;  a_MidPoint = 35; break;
+		case biDesert:               a_HeightAmp = 0.29f;  a_MidPoint = 62; break;
+		case biEnd:                  a_HeightAmp = 0.15f;  a_MidPoint = 64; break;
+		case biExtremeHills:         a_HeightAmp = 0.045f; a_MidPoint = 75; break;
+		case biExtremeHillsPlus:     a_HeightAmp = 0.04f;  a_MidPoint = 80; break;
+		case biFlowerForest:         a_HeightAmp = 0.1f;   a_MidPoint = 64; break;
+		case biForest:               a_HeightAmp = 0.1f;   a_MidPoint = 64; break;
+		case biForestHills:          a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biFrozenRiver:          a_HeightAmp = 0.4f;   a_MidPoint = 53; break;
+		case biFrozenOcean:          a_HeightAmp = 0.17f;  a_MidPoint = 47; break;
+		case biIceMountains:         a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biIcePlains:            a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biIcePlainsSpikes:      a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biJungle:               a_HeightAmp = 0.1f;   a_MidPoint = 63; break;
+		case biJungleHills:          a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biJungleM:              a_HeightAmp = 0.1f;   a_MidPoint = 63; break;
+		case biMegaSpruceTaigaHills: a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biMegaTaigaHills:       a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+		case biMushroomShore:        a_HeightAmp = 0.15f;  a_MidPoint = 15; break;
+		case biOcean:                a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biPlains:               a_HeightAmp = 0.3f;   a_MidPoint = 62; break;
+		case biRiver:                a_HeightAmp = 0.4f;   a_MidPoint = 53; break;
+		case biSwampland:            a_HeightAmp = 0.25f;  a_MidPoint = 59; break;
+		case biSwamplandM:           a_HeightAmp = 0.11f;  a_MidPoint = 59; break;
+		case biTaigaHills:           a_HeightAmp = 0.075f; a_MidPoint = 68; break;
+
+		/*
+		// Still missing:
+		case biColdTaiga:            a_HeightAmp = 0.15f;  a_MidPoint = 30; break;
+		case biColdTaigaHills:       a_HeightAmp = 0.15f;  a_MidPoint = 31; break;
+		case biColdTaigaM:           a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biDesertM:              a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biExtremeHillsEdge:     a_HeightAmp = 0.15f;  a_MidPoint = 20; break;
+		case biExtremeHillsM:        a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biExtremeHillsPlusM:    a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biJungleEdge:           a_HeightAmp = 0.15f;  a_MidPoint = 23; break;
+		case biJungleEdgeM:          a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biMegaSpruceTaiga:      a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biMegaTaiga:            a_HeightAmp = 0.15f;  a_MidPoint = 32; break;
+		case biMesa:                 a_HeightAmp = 0.15f;  a_MidPoint = 37; break;
+		case biMesaBryce:            a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biMesaPlateau:          a_HeightAmp = 0.15f;  a_MidPoint = 39; break;
+		case biMesaPlateauF:         a_HeightAmp = 0.15f;  a_MidPoint = 38; break;
+		case biMesaPlateauFM:        a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biMesaPlateauM:         a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biMushroomIsland:       a_HeightAmp = 0.15f;  a_MidPoint = 14; break;
+		case biNether:               a_HeightAmp = 0.15f;  a_MidPoint = 68; break;
+		case biRoofedForest:         a_HeightAmp = 0.15f;  a_MidPoint = 29; break;
+		case biRoofedForestM:        a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biSavanna:              a_HeightAmp = 0.15f;  a_MidPoint = 35; break;
+		case biSavannaM:             a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biSavannaPlateau:       a_HeightAmp = 0.15f;  a_MidPoint = 36; break;
+		case biSavannaPlateauM:      a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biStoneBeach:           a_HeightAmp = 0.15f;  a_MidPoint = 25; break;
+		case biSunflowerPlains:      a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		case biTaiga:                a_HeightAmp = 0.15f;  a_MidPoint = 65; break;
+		case biTaigaM:               a_HeightAmp = 0.15f;  a_MidPoint = 70; break;
+		*/
+
+		default:
+		{
+			// Make a crazy terrain so that it stands out
+			a_HeightAmp = 0.001f;
+			a_MidPoint = 90;
+			break;
+		}
+	}
+}
+
+
+
+
+
+void cBiomalNoise3DComposable::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap)
 {
 	GenerateNoiseArrayIfNeeded(a_ChunkX, a_ChunkZ);
 
@@ -520,7 +861,7 @@ void cNoise3DComposable::GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::Hei
 
 
 
-void cNoise3DComposable::ComposeTerrain(cChunkDesc & a_ChunkDesc)
+void cBiomalNoise3DComposable::ComposeTerrain(cChunkDesc & a_ChunkDesc)
 {
 	GenerateNoiseArrayIfNeeded(a_ChunkDesc.GetChunkX(), a_ChunkDesc.GetChunkZ());
 
diff --git a/src/Generating/Noise3DGenerator.h b/src/Generating/Noise3DGenerator.h
index 42f61a854..ba541fbcc 100644
--- a/src/Generating/Noise3DGenerator.h
+++ b/src/Generating/Noise3DGenerator.h
@@ -1,7 +1,11 @@
 
 // Noise3DGenerator.h
 
-// Generates terrain using 3D noise, rather than composing. Is a test.
+// Declares cNoise3DGenerator and cNoise3DComposable classes, representing 3D-noise-based generators.
+// They generate terrain shape by combining a lerp of two 3D noises with a vertical linear gradient
+// cNoise3DGenerator is obsolete and unmaintained.
+// cNoise3DComposable is used to test parameter combinations for single-biome worlds.
+
 
 
 
@@ -74,31 +78,147 @@ public:
 	void Initialize(cIniFile & a_IniFile);
 
 protected:
-	cNoise m_Noise1;
-	cNoise m_Noise2;
-	cNoise m_Noise3;
+	/** The noise that is used to choose between density noise A and B. */
+	cPerlinNoise m_ChoiceNoise;
+
+	/** Density 3D noise, variant A. */
+	cPerlinNoise m_DensityNoiseA;
+
+	/** Density 3D noise, variant B. */
+	cPerlinNoise m_DensityNoiseB;
+
+	/** Heightmap-like noise used to provide variance for low-amplitude biomes. */
+	cPerlinNoise m_BaseNoise;
 	
-	int            m_SeaLevel;
+	/** Block height of the sealevel, used for composing the terrain. */
+	int m_SeaLevel;
+
+	/** The main parameter of the generator, specifies the slope of the vertical linear gradient.
+	A higher value means a steeper slope and a smaller total amplitude of the generated terrain. */
 	NOISE_DATATYPE m_HeightAmplification;
-	NOISE_DATATYPE m_MidPoint;  // Where the vertical "center" of the noise should be
+
+	/** Where the vertical "center" of the noise should be, as block height. */
+	NOISE_DATATYPE m_MidPoint;
+
+	// Frequency of the 3D noise's first octave:
 	NOISE_DATATYPE m_FrequencyX;
 	NOISE_DATATYPE m_FrequencyY;
 	NOISE_DATATYPE m_FrequencyZ;
+
+	// Frequency of the base terrain noise:
+	NOISE_DATATYPE m_BaseFrequencyX;
+	NOISE_DATATYPE m_BaseFrequencyZ;
+
+	// Frequency of the choice noise:
+	NOISE_DATATYPE m_ChoiceFrequencyX;
+	NOISE_DATATYPE m_ChoiceFrequencyY;
+	NOISE_DATATYPE m_ChoiceFrequencyZ;
+
+	// Threshold for when the values are considered air:
 	NOISE_DATATYPE m_AirThreshold;
 	
+	// Cache for the last calculated chunk (reused between heightmap and composition queries):
 	int m_LastChunkX;
 	int m_LastChunkZ;
 	NOISE_DATATYPE m_NoiseArray[17 * 17 * 257];  // x + 17 * z + 17 * 17 * y
 	
 	
-	/// Generates the 3D noise array used for terrain generation, unless the LastChunk coords are equal to coords given
+	/** Generates the 3D noise array used for terrain generation (m_NoiseArray), unless the LastChunk coords are equal to coords given */
 	void GenerateNoiseArrayIfNeeded(int a_ChunkX, int a_ChunkZ);
 	
 	// cTerrainHeightGen overrides:
 	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override { Initialize(a_IniFile); }
+
+	// cTerrainCompositionGen overrides:
+	virtual void ComposeTerrain(cChunkDesc & a_ChunkDesc) override;
+	virtual void InitializeCompoGen(cIniFile & a_IniFile) override { Initialize(a_IniFile); }
+} ;
+
+
+
+
+
+class cBiomalNoise3DComposable :
+	public cTerrainHeightGen,
+	public cTerrainCompositionGen
+{
+public:
+	cBiomalNoise3DComposable(int a_Seed, cBiomeGenPtr a_BiomeGen);
+
+	void Initialize(cIniFile & a_IniFile);
+
+protected:
+	/** Number of columns around the pixel to query for biomes for averaging. */
+	static const int AVERAGING_SIZE = 5;
+
+	/** Type used for a single parameter across the entire (downscaled) chunk. */
+	typedef NOISE_DATATYPE ChunkParam[5 * 5];
+
+
+	/** The noise that is used to choose between density noise A and B. */
+	cPerlinNoise m_ChoiceNoise;
+
+	/** Density 3D noise, variant A. */
+	cPerlinNoise m_DensityNoiseA;
+
+	/** Density 3D noise, variant B. */
+	cPerlinNoise m_DensityNoiseB;
+
+	/** Heightmap-like noise used to provide variance for low-amplitude biomes. */
+	cPerlinNoise m_BaseNoise;
+
+	/** The underlying biome generator. */
+	cBiomeGenPtr m_BiomeGen;
+	
+	/** Block height of the sealevel, used for composing the terrain. */
+	int m_SeaLevel;
+
+	// Frequency of the 3D noise's first octave:
+	NOISE_DATATYPE m_FrequencyX;
+	NOISE_DATATYPE m_FrequencyY;
+	NOISE_DATATYPE m_FrequencyZ;
+
+	// Frequency of the base terrain noise:
+	NOISE_DATATYPE m_BaseFrequencyX;
+	NOISE_DATATYPE m_BaseFrequencyZ;
+
+	// Frequency of the choice noise:
+	NOISE_DATATYPE m_ChoiceFrequencyX;
+	NOISE_DATATYPE m_ChoiceFrequencyY;
+	NOISE_DATATYPE m_ChoiceFrequencyZ;
+
+	// Threshold for when the values are considered air:
+	NOISE_DATATYPE m_AirThreshold;
+	
+	// Cache for the last calculated chunk (reused between heightmap and composition queries):
+	int m_LastChunkX;
+	int m_LastChunkZ;
+	NOISE_DATATYPE m_NoiseArray[17 * 17 * 257];  // x + 17 * z + 17 * 17 * y
+
+	/** Weights for summing up neighboring biomes. */
+	NOISE_DATATYPE m_Weight[AVERAGING_SIZE * 2 + 1][AVERAGING_SIZE * 2 + 1];
+
+	/** The sum of m_Weight[]. */
+	NOISE_DATATYPE m_WeightSum;
+	
+	
+	/** Generates the 3D noise array used for terrain generation (m_NoiseArray), unless the LastChunk coords are equal to coords given */
+	void GenerateNoiseArrayIfNeeded(int a_ChunkX, int a_ChunkZ);
+
+	/** Calculates the biome-related parameters for the chunk. */
+	void CalcBiomeParamArrays(int a_ChunkX, int a_ChunkZ, ChunkParam & a_HeightAmp, ChunkParam & a_MidPoint);
+
+	/** Returns the parameters for the specified biome. */
+	void GetBiomeParams(EMCSBiome a_Biome, NOISE_DATATYPE & a_HeightAmp, NOISE_DATATYPE & a_MidPoint);
+	
+	// cTerrainHeightGen overrides:
+	virtual void GenHeightMap(int a_ChunkX, int a_ChunkZ, cChunkDef::HeightMap & a_HeightMap) override;
+	virtual void InitializeHeightGen(cIniFile & a_IniFile) override { Initialize(a_IniFile); }
 
 	// cTerrainCompositionGen overrides:
 	virtual void ComposeTerrain(cChunkDesc & a_ChunkDesc) override;
+	virtual void InitializeCompoGen(cIniFile & a_IniFile) override { Initialize(a_IniFile); }
 } ;
 
 
diff --git a/src/Generating/PieceGenerator.cpp b/src/Generating/PieceGenerator.cpp
index ae4b6e36c..97aa646fc 100644
--- a/src/Generating/PieceGenerator.cpp
+++ b/src/Generating/PieceGenerator.cpp
@@ -289,7 +289,7 @@ cPlacedPiece::cPlacedPiece(const cPlacedPiece * a_Parent, const cPiece & a_Piece
 	m_NumCCWRotations(a_NumCCWRotations),
 	m_HasBeenMovedToGround(false)
 {
-	m_Depth = (m_Parent == NULL) ? 0 : (m_Parent->GetDepth() + 1);
+	m_Depth = (m_Parent == nullptr) ? 0 : (m_Parent->GetDepth() + 1);
 	m_HitBox = a_Piece.RotateMoveHitBox(a_NumCCWRotations, a_Coords.x, a_Coords.y, a_Coords.z);
 	m_HitBox.Sort();
 }
@@ -402,7 +402,7 @@ cPlacedPiece * cPieceGenerator::PlaceStartingPiece(int a_BlockX, int a_BlockY, i
 	}
 	int Rotation = Rotations[rnd % NumRotations];
 	
-	cPlacedPiece * res = new cPlacedPiece(NULL, *StartingPiece, Vector3i(a_BlockX, a_BlockY, a_BlockZ), Rotation);
+	cPlacedPiece * res = new cPlacedPiece(nullptr, *StartingPiece, Vector3i(a_BlockX, a_BlockY, a_BlockZ), Rotation);
 
 	// Place the piece's connectors into a_OutConnectors:
 	const cPiece::cConnectors & Conn = StartingPiece->GetConnectors();
diff --git a/src/Generating/Prefab.cpp b/src/Generating/Prefab.cpp
index 6da3c3d10..761986690 100644
--- a/src/Generating/Prefab.cpp
+++ b/src/Generating/Prefab.cpp
@@ -328,7 +328,7 @@ void cPrefab::AddConnector(int a_RelX, int a_RelY, int a_RelZ, eBlockFace a_Dire
 
 void cPrefab::ParseCharMap(CharMap & a_CharMapOut, const char * a_CharMapDef)
 {
-	ASSERT(a_CharMapDef != NULL);
+	ASSERT(a_CharMapDef != nullptr);
 	
 	// Initialize the charmap to all-invalid values:
 	for (size_t i = 0; i < ARRAYCOUNT(a_CharMapOut); i++)
@@ -389,7 +389,7 @@ void cPrefab::ParseBlockImage(const CharMap & a_CharMap, const char * a_BlockIma
 
 void cPrefab::ParseConnectors(const char * a_ConnectorsDef)
 {
-	ASSERT(a_ConnectorsDef != NULL);
+	ASSERT(a_ConnectorsDef != nullptr);
 	
 	AStringVector Lines = StringSplitAndTrim(a_ConnectorsDef, "\n");
 	for (AStringVector::const_iterator itr = Lines.begin(), end = Lines.end(); itr != end; ++itr)
@@ -436,7 +436,7 @@ void cPrefab::ParseConnectors(const char * a_ConnectorsDef)
 void cPrefab::ParseDepthWeight(const char * a_DepthWeightDef)
 {
 	// The member needn't be defined at all, if so, skip:
-	if (a_DepthWeightDef == NULL)
+	if (a_DepthWeightDef == nullptr)
 	{
 		return;
 	}
diff --git a/src/Generating/PrefabPiecePool.cpp b/src/Generating/PrefabPiecePool.cpp
index 122b9d2af..895555ef8 100644
--- a/src/Generating/PrefabPiecePool.cpp
+++ b/src/Generating/PrefabPiecePool.cpp
@@ -16,7 +16,7 @@ cPrefabPiecePool::cPrefabPiecePool(
 )
 {
 	AddPieceDefs(a_PieceDefs, a_NumPieceDefs);
-	if (a_StartingPieceDefs != NULL)
+	if (a_StartingPieceDefs != nullptr)
 	{
 		AddStartingPieceDefs(a_StartingPieceDefs, a_NumStartingPieceDefs);
 	}
@@ -56,7 +56,7 @@ void cPrefabPiecePool::Clear(void)
 
 void cPrefabPiecePool::AddPieceDefs(const cPrefab::sDef * a_PieceDefs, size_t a_NumPieceDefs)
 {
-	ASSERT(a_PieceDefs != NULL);
+	ASSERT(a_PieceDefs != nullptr);
 	for (size_t i = 0; i < a_NumPieceDefs; i++)
 	{
 		cPrefab * Prefab = new cPrefab(a_PieceDefs[i]);
@@ -71,7 +71,7 @@ void cPrefabPiecePool::AddPieceDefs(const cPrefab::sDef * a_PieceDefs, size_t a_
 
 void cPrefabPiecePool::AddStartingPieceDefs(const cPrefab::sDef * a_StartingPieceDefs, size_t a_NumStartingPieceDefs)
 {
-	ASSERT(a_StartingPieceDefs != NULL);
+	ASSERT(a_StartingPieceDefs != nullptr);
 	for (size_t i = 0; i < a_NumStartingPieceDefs; i++)
 	{
 		cPrefab * Prefab = new cPrefab(a_StartingPieceDefs[i]);
diff --git a/src/Generating/Prefabs/CMakeLists.txt b/src/Generating/Prefabs/CMakeLists.txt
index 2c62aa73d..68f6491c4 100644
--- a/src/Generating/Prefabs/CMakeLists.txt
+++ b/src/Generating/Prefabs/CMakeLists.txt
@@ -29,5 +29,5 @@ SET (HDRS
 if(NOT MSVC)
 	add_library(Generating_Prefabs ${SRCS} ${HDRS})
 
-	target_link_libraries(Generating_Prefabs OSSupport iniFile Blocks)
+	target_link_libraries(Generating_Prefabs OSSupport Blocks)
 endif()
diff --git a/src/Generating/ProtIntGen.h b/src/Generating/ProtIntGen.h
new file mode 100644
index 000000000..73ed27096
--- /dev/null
+++ b/src/Generating/ProtIntGen.h
@@ -0,0 +1,1351 @@
+
+// ProtIntGen.h
+
+// Declares the prototyping integer generators - cProtIntGen class and its descendants
+
+/*
+These classes generate 2D arrays of integers that have various interpretations. The main purpose of these
+classes is to provide fast prototyping for cIntGen classes - unlike cIntGen classes, these are not
+template-based and so they take care of the underlying sizes automatically. This makes them easier to chain
+and re-chain, since the size parameters don't need to be adjusted after each such case. Their performance is,
+however, slightly worse, which is why we use cIntGen classes in the final generator.
+
+Because there is no SizeX / SizeZ template param, the generators would have to either alloc memory for each
+underlying generator's values, or use a maximum-size buffer. We chose the latter, to avoid memory allocation
+overhead; this however means that there's (an arbitrary) limit to the size of the generated data.
+*/
+
+
+
+
+
+#pragma once
+
+// We need the biome group constants defined there:
+#include "IntGen.h"
+
+
+
+
+
+/** Interface that all the generator classes provide. */
+class cProtIntGen
+{
+protected:
+	/** Maximum size of the generated area.
+	Adjust the constant if you need larger areas, these are just so that we can use fixed-size buffers. */
+	static const int m_BufferSize = 900;
+
+public:
+
+	/** Type of the generic interface used for storing links to the underlying generators. */
+	typedef std::shared_ptr<cProtIntGen> Underlying;
+
+
+	/** Force a virtual destructor in all descendants.
+	Descendants contain virtual functions and are referred to via pointer-to-base, so they need a virtual destructor. */
+	virtual ~cProtIntGen() {}
+
+	/** Generates the array of specified size into a_Values, based on given min coords. */
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) = 0;
+};
+
+
+
+
+
+/** Provides additional cNoise member and its helper functions. */
+class cProtIntGenWithNoise :
+	public cProtIntGen
+{
+	typedef cProtIntGen super;
+
+public:
+	cProtIntGenWithNoise(int a_Seed) :
+		m_Noise(a_Seed)
+	{
+	}
+
+protected:
+	cNoise m_Noise;
+
+	/** Chooses one of a_Val1 or a_Val2, based on m_Noise and the coordinates for querying the noise. */
+	int chooseRandomOne(int a_RndX, int a_RndZ, int a_Val1, int a_Val2)
+	{
+		int rnd = m_Noise.IntNoise2DInt(a_RndX, a_RndZ) / 7;
+		return ((rnd & 1) == 0) ? a_Val1 : a_Val2;
+	}
+
+	/** Chooses one of a_ValN, based on m_Noise and the coordinates for querying the noise. */
+	int chooseRandomOne(int a_RndX, int a_RndZ, int a_Val1, int a_Val2, int a_Val3, int a_Val4)
+	{
+		int rnd = m_Noise.IntNoise2DInt(a_RndX, a_RndZ) / 7;
+		switch (rnd % 4)
+		{
+			case 0:  return a_Val1;
+			case 1:  return a_Val2;
+			case 2:  return a_Val3;
+			default: return a_Val4;
+		}
+	}
+};
+
+
+
+
+
+
+/** Generates a 2D array of random integers in the specified range [0 .. Range). */
+class cProtIntGenChoice :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenChoice(int a_Seed, int a_Range) :
+		super(a_Seed),
+		m_Range(a_Range)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int BaseZ = a_MinZ + z;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				a_Values[x + a_SizeX * z] = (super::m_Noise.IntNoise2DInt(a_MinX + x, BaseZ) / 7) % m_Range;
+			}
+		}  // for z
+	}
+
+protected:
+	int m_Range;
+};
+
+
+
+
+
+
+/** Decides between the ocean and landmass biomes.
+Has a threshold (in percent) of how much land, the larger the threshold, the more land.
+Generates 0 for ocean, biome group ID for landmass. */
+class cProtIntGenLandOcean :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenLandOcean(int a_Seed, int a_Threshold) :
+		super(a_Seed),
+		m_Threshold(a_Threshold)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int BaseZ = a_MinZ + z;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int rnd = (super::m_Noise.IntNoise2DInt(a_MinX + x, BaseZ) / 7);
+				a_Values[x + a_SizeX * z] = ((rnd % 100) < m_Threshold) ? ((rnd / 101) % bgLandOceanMax + 1) : 0;
+			}
+		}
+
+		// If the centerpoint of the world is within the area, set it to bgTemperate, always:
+		if ((a_MinX <= 0) && (a_MinZ <= 0) && (a_MinX + a_SizeX > 0) && (a_MinZ + a_SizeZ > 0))
+		{
+			a_Values[-a_MinX - a_MinZ * a_SizeX] = bgTemperate;
+		}
+	}
+
+protected:
+	int m_Threshold;
+};
+
+
+
+
+
+/** Zooms the underlying value array to twice the size. Uses random-neighbor for the pixels in-between.
+This means that the zoome out image is randomly distorted. Applying zoom several times provides all
+the distortion that the generators need. */
+class cProtIntGenZoom :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenZoom(int a_Seed, Underlying a_UnderlyingGen) :
+		super(a_Seed),
+		m_UnderlyingGen(a_UnderlyingGen)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Get the coords for the lower generator:
+		int lowerMinX = a_MinX >> 1;
+		int lowerMinZ = a_MinZ >> 1;
+		int lowerSizeX = a_SizeX / 2 + 2;
+		int lowerSizeZ = a_SizeZ / 2 + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		ASSERT(lowerSizeX > 0);
+		ASSERT(lowerSizeZ > 0);
+
+		// Generate the underlying data with half the resolution:
+		int lowerData[m_BufferSize];
+		m_UnderlyingGen->GetInts(lowerMinX, lowerMinZ, lowerSizeX, lowerSizeZ, lowerData);
+		const int lowStepX = (lowerSizeX - 1) * 2;
+		int cache[m_BufferSize];
+
+		// Discreet-interpolate the values into twice the size:
+		for (int z = 0; z < lowerSizeZ - 1; ++z)
+		{
+			int idx = (z * 2) * lowStepX;
+			int PrevZ0 = lowerData[z * lowerSizeX];
+			int PrevZ1 = lowerData[(z + 1) * lowerSizeX];
+
+			for (int x = 0; x < lowerSizeX - 1; ++x)
+			{
+				int ValX1Z0 = lowerData[x + 1 + z * lowerSizeX];
+				int ValX1Z1 = lowerData[x + 1 + (z + 1) * lowerSizeX];
+				int RndX = (x + lowerMinX) * 2;
+				int RndZ = (z + lowerMinZ) * 2;
+				cache[idx] = PrevZ0;
+				cache[idx + lowStepX] = super::chooseRandomOne(RndX, RndZ + 1, PrevZ0, PrevZ1);
+				cache[idx + 1]        = super::chooseRandomOne(RndX, RndZ - 1, PrevZ0, ValX1Z0);
+				cache[idx + 1 + lowStepX] = super::chooseRandomOne(RndX, RndZ, PrevZ0, ValX1Z0, PrevZ1, ValX1Z1);
+				idx += 2;
+				PrevZ0 = ValX1Z0;
+				PrevZ1 = ValX1Z1;
+			}
+		}
+
+		// Copy from Cache into a_Values; take into account the even/odd offsets in a_Min:
+		for (int z = 0; z < a_SizeZ; ++z)
+		{
+			memcpy(a_Values + z * a_SizeX, cache + (z + (a_MinZ & 1)) * lowStepX + (a_MinX & 1), a_SizeX * sizeof(int));
+		}
+	}
+
+protected:
+	Underlying m_UnderlyingGen;
+};
+
+
+
+
+
+/** Smoothes out some artifacts generated by the zooming - mostly single-pixel values.
+Compares each pixel to its neighbors and if the neighbors are equal, changes the pixel to their value. */
+class cProtIntGenSmooth :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenSmooth(int a_Seed, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying values:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerData[m_BufferSize];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerSizeX, lowerSizeZ, lowerData);
+
+		// Smooth - for each square check if the surroundings are the same, if so, expand them diagonally.
+		// Also get rid of single-pixel irregularities (A-B-A):
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int NoiseZ = a_MinZ + z;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int val   = lowerData[x + 1 + (z + 1) * lowerSizeX];
+				int above = lowerData[x + 1 +  z      * lowerSizeX];
+				int below = lowerData[x + 1 + (z + 2) * lowerSizeX];
+				int left  = lowerData[x     + (z + 1) * lowerSizeX];
+				int right = lowerData[x + 2 + (z + 1) * lowerSizeX];
+
+				if ((left == right) && (above == below))
+				{
+					if (((super::m_Noise.IntNoise2DInt(a_MinX + x, NoiseZ) / 7) % 2) == 0)
+					{
+						val = left;
+					}
+					else
+					{
+						val = above;
+					}
+				}
+				else
+				{
+					if (left == right)
+					{
+						val = left;
+					}
+
+					if (above == below)
+					{
+						val = above;
+					}
+				}
+
+				a_Values[x + z * a_SizeX] = val;
+			}
+		}
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Converts land biomes at the edge of an ocean into the respective beach biome. */
+class cProtIntGenBeaches :
+	public cProtIntGen
+{
+	typedef cProtIntGen super;
+
+public:
+	cProtIntGenBeaches(Underlying a_Underlying) :
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Map for biome -> its beach:
+		static const int ToBeach[] =
+		{
+			/* biOcean            */ biOcean,
+			/* biPlains           */ biBeach,
+			/* biDesert           */ biBeach,
+			/* biExtremeHills     */ biStoneBeach,
+			/* biForest           */ biBeach,
+			/* biTaiga            */ biColdBeach,
+			/* biSwampland        */ biSwampland,
+			/* biRiver            */ biRiver,
+			/* biNether           */ biNether,
+			/* biEnd              */ biEnd,
+			/* biFrozenOcean      */ biColdBeach,
+			/* biFrozenRiver      */ biColdBeach,
+			/* biIcePlains        */ biColdBeach,
+			/* biIceMountains     */ biColdBeach,
+			/* biMushroomIsland   */ biMushroomShore,
+			/* biMushroomShore    */ biMushroomShore,
+			/* biBeach            */ biBeach,
+			/* biDesertHills      */ biBeach,
+			/* biForestHills      */ biBeach,
+			/* biTaigaHills       */ biColdBeach,
+			/* biExtremeHillsEdge */ biStoneBeach,
+			/* biJungle           */ biBeach,
+			/* biJungleHills      */ biBeach,
+			/* biJungleEdge       */ biBeach,
+			/* biDeepOcean        */ biOcean,
+			/* biStoneBeach       */ biStoneBeach,
+			/* biColdBeach        */ biColdBeach,
+			/* biBirchForest      */ biBeach,
+			/* biBirchForestHills */ biBeach,
+			/* biRoofedForest     */ biBeach,
+			/* biColdTaiga        */ biColdBeach,
+			/* biColdTaigaHills   */ biColdBeach,
+			/* biMegaTaiga        */ biStoneBeach,
+			/* biMegaTaigaHills   */ biStoneBeach,
+			/* biExtremeHillsPlus */ biStoneBeach,
+			/* biSavanna          */ biBeach,
+			/* biSavannaPlateau   */ biBeach,
+			/* biMesa             */ biMesa,
+			/* biMesaPlateauF     */ biMesa,
+			/* biMesaPlateau      */ biMesa,
+		};
+
+		// Generate the underlying values:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerValues[m_BufferSize];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerSizeX, lowerSizeZ, lowerValues);
+
+		// Add beaches between ocean and biomes:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int val   = lowerValues[x + 1 + (z + 1) * lowerSizeX];
+				int above = lowerValues[x + 1 + z       * lowerSizeX];
+				int below = lowerValues[x + 1 + (z + 2) * lowerSizeX];
+				int left  = lowerValues[x     + (z + 1) * lowerSizeX];
+				int right = lowerValues[x + 2 + (z + 1) * lowerSizeX];
+				if (!IsBiomeOcean(val))
+				{
+					if (IsBiomeOcean(above) || IsBiomeOcean(below) || IsBiomeOcean(left) || IsBiomeOcean(right))
+					{
+						// First convert the value to a regular biome (drop the M flag), then modulo by our biome count:
+						val = ToBeach[(val % 128) % ARRAYCOUNT(ToBeach)];
+					}
+				}
+				a_Values[x + z * a_SizeX] = val;
+			}
+		}
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Generates the underlying numbers and then randomly changes some ocean group pixels into random land
+biome group pixels, based on the predefined chance. */
+class cProtIntGenAddIslands :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	typedef std::shared_ptr<cProtIntGen> Underlying;
+
+
+	cProtIntGenAddIslands(int a_Seed, int a_Chance, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				if (a_Values[x + z * a_SizeX] == bgOcean)
+				{
+					int rnd = super::m_Noise.IntNoise2DInt(a_MinX + x, a_MinZ + z) / 7;
+					if (rnd % 1000 < m_Chance)
+					{
+						a_Values[x + z * a_SizeX] = (rnd / 1003) % bgLandOceanMax;
+					}
+				}
+			}
+		}
+	}
+
+protected:
+	/** Chance of each ocean pixel being converted, in permille. */
+	int m_Chance;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** A filter that adds an edge biome group between two biome groups that need an edge between them. */
+class cProtIntGenBiomeGroupEdges :
+	public cProtIntGen
+{
+	typedef cProtIntGen super;
+
+public:
+	cProtIntGenBiomeGroupEdges(Underlying a_Underlying) :
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values)
+	{
+		// Generate the underlying biome groups:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerValues[m_BufferSize];
+		m_Underlying->GetInts(a_MinX, a_MinZ, lowerSizeX, lowerSizeZ, lowerValues);
+
+		// Change the biomes on incompatible edges into an edge biome:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int val   = lowerValues[x + 1 + (z + 1) * lowerSizeX];
+				int Above = lowerValues[x + 1 + z       * lowerSizeX];
+				int Below = lowerValues[x + 1 + (z + 2) * lowerSizeX];
+				int Left  = lowerValues[x     + (z + 1) * lowerSizeX];
+				int Right = lowerValues[x + 2 + (z + 1) * lowerSizeX];
+				switch (val)
+				{
+					// Desert should neighbor only oceans, desert and temperates; change to temperate when another:
+					case bgDesert:
+					{
+						if (
+							!isDesertCompatible(Above) ||
+							!isDesertCompatible(Below) ||
+							!isDesertCompatible(Left) ||
+							!isDesertCompatible(Right)
+						)
+						{
+							val = bgTemperate;
+						}
+						break;
+					}  // case bgDesert
+
+					// Ice should not neighbor deserts; change to temperate:
+					case bgIce:
+					{
+						if (
+							(Above == bgDesert) ||
+							(Below == bgDesert) ||
+							(Left  == bgDesert) ||
+							(Right == bgDesert)
+						)
+						{
+							val = bgTemperate;
+						}
+						break;
+					}  // case bgIce
+				}
+				a_Values[x + z * a_SizeX] = val;
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Underlying;
+
+
+	inline bool isDesertCompatible(int a_BiomeGroup)
+	{
+		switch (a_BiomeGroup)
+		{
+			case bgOcean:
+			case bgDesert:
+			case bgTemperate:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+};
+
+
+
+
+
+/** Turns biome group indices into real biomes.
+For each pixel, takes its biome group and chooses a random biome from that group; replaces the value with
+that biome. */
+class cProtIntGenBiomes :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenBiomes(int a_Seed, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Define the per-biome-group biomes:
+		static const int oceanBiomes[] =
+		{
+			biOcean,  // biDeepOcean,
+		};
+
+		// Same as oceanBiomes, there are no rare oceanic biomes (mushroom islands are handled separately)
+		static const int rareOceanBiomes[] =
+		{
+			biOcean,
+		};
+
+		static const int desertBiomes[] =
+		{
+			biDesert, biDesert, biDesert, biDesert, biDesert, biDesert, biSavanna, biSavanna, biPlains,
+		};
+
+		static const int rareDesertBiomes[] =
+		{
+			biMesaPlateau, biMesaPlateauF,
+		};
+
+		static const int temperateBiomes[] =
+		{
+			biForest, biForest, biRoofedForest, biExtremeHills, biPlains, biBirchForest, biSwampland,
+		};
+
+		static const int rareTemperateBiomes[] =
+		{
+			biJungle,  // Jungle is not strictly temperate, but let's piggyback it here
+		};
+
+		static const int mountainBiomes[] =
+		{
+			biExtremeHills, biForest, biTaiga, biPlains,
+		};
+
+		static const int rareMountainBiomes[] =
+		{
+			biMegaTaiga,
+		};
+
+		static const int iceBiomes[] =
+		{
+			biIcePlains, biIcePlains, biIcePlains, biIcePlains, biColdTaiga,
+		};
+
+		// Same as iceBiomes, there's no rare ice biome
+		static const int rareIceBiomes[] =
+		{
+			biIcePlains, biIcePlains, biIcePlains, biIcePlains, biColdTaiga,
+		};
+
+		static const cBiomesInGroups biomesInGroups[] =
+		{
+			/* bgOcean */     { static_cast<int>(ARRAYCOUNT(oceanBiomes)),     oceanBiomes},
+			/* bgDesert */    { static_cast<int>(ARRAYCOUNT(desertBiomes)),    desertBiomes},
+			/* bgTemperate */ { static_cast<int>(ARRAYCOUNT(temperateBiomes)), temperateBiomes},
+			/* bgMountains */ { static_cast<int>(ARRAYCOUNT(mountainBiomes)),  mountainBiomes},
+			/* bgIce */       { static_cast<int>(ARRAYCOUNT(iceBiomes)),       iceBiomes},
+		};
+
+		static const cBiomesInGroups rareBiomesInGroups[] =
+		{
+			/* bgOcean */     { static_cast<int>(ARRAYCOUNT(rareOceanBiomes)),     rareOceanBiomes},
+			/* bgDesert */    { static_cast<int>(ARRAYCOUNT(rareDesertBiomes)),    rareDesertBiomes},
+			/* bgTemperate */ { static_cast<int>(ARRAYCOUNT(rareTemperateBiomes)), rareTemperateBiomes},
+			/* bgMountains */ { static_cast<int>(ARRAYCOUNT(rareMountainBiomes)),  rareMountainBiomes},
+			/* bgIce */       { static_cast<int>(ARRAYCOUNT(rareIceBiomes)),       rareIceBiomes},
+		};
+
+		// Generate the underlying values, representing biome groups:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+
+		// Overwrite each biome group with a random biome from that group:
+		// Take care of the bgfRare flag
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int IdxZ = z * a_SizeX;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int val = a_Values[x + IdxZ];
+				const cBiomesInGroups & Biomes = (val > bgfRare) ?
+					rareBiomesInGroups[(val & (bgfRare - 1)) % ARRAYCOUNT(rareBiomesInGroups)] :
+					biomesInGroups[val % ARRAYCOUNT(biomesInGroups)];
+				int rnd = (super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7);
+				a_Values[x + IdxZ] = Biomes.Biomes[rnd % Biomes.Count];
+			}
+		}
+	}
+
+protected:
+
+	struct cBiomesInGroups
+	{
+		const int Count;
+		const int * Biomes;
+	};
+
+
+	/** The underlying int generator */
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Randomly replaces pixels of one value to another value, using the given chance. */
+class cProtIntGenReplaceRandomly :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	typedef std::shared_ptr<cProtIntGen> Underlying;
+
+
+	cProtIntGenReplaceRandomly(int a_Seed, int a_From, int a_To, int a_Chance, Underlying a_Underlying) :
+		super(a_Seed),
+		m_From(a_From),
+		m_To(a_To),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying values:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+
+		// Replace some of the values:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int idxZ = z * a_SizeX;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int idx = x + idxZ;
+				if (a_Values[idx] == m_From)
+				{
+					int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+					if (rnd % 1000 < m_Chance)
+					{
+						a_Values[idx] = m_To;
+					}
+				}
+			}
+		}  // for z
+	}
+
+
+protected:
+	/** The original value to be replaced. */
+	int m_From;
+
+	/** The destination value to which to replace. */
+	int m_To;
+
+	/** Chance, in permille, of replacing the value. */
+	int m_Chance;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Mixer that joins together finalized biomes and rivers.
+It first checks for oceans, if there is an ocean in the Biomes, it keeps the ocean.
+If there's no ocean, it checks Rivers for a river, if there is a river, it uses the Biomes to select either
+regular river or frozen river, based on the biome. */
+class cProtIntGenMixRivers:
+	public cProtIntGen
+{
+	typedef cProtIntGen super;
+
+public:
+	cProtIntGenMixRivers(Underlying a_Biomes, Underlying a_Rivers):
+		m_Biomes(a_Biomes),
+		m_Rivers(a_Rivers)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying data:
+		ASSERT(a_SizeX * a_SizeZ <= m_BufferSize);
+		m_Biomes->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+		int riverData[m_BufferSize];
+		m_Rivers->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, riverData);
+
+		// Mix the values:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			int idxZ = z * a_SizeX;
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int idx = x + idxZ;
+				if (IsBiomeOcean(a_Values[idx]))
+				{
+					// Oceans are kept without any changes
+					continue;
+				}
+				if (riverData[idx] != biRiver)
+				{
+					// There's no river, keep the current value
+					continue;
+				}
+
+				// There's a river, change the output to a river or a frozen river, based on the original biome:
+				if (IsBiomeVeryCold((EMCSBiome)a_Values[idx]))
+				{
+					a_Values[idx] = biFrozenRiver;
+				}
+				else
+				{
+					a_Values[idx] = biRiver;
+				}
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Biomes;
+	Underlying m_Rivers;
+};
+
+
+
+
+
+/** Generates a river based on the underlying data.
+This is basically an edge detector over the underlying data. The rivers are the edges where the underlying
+data changes from one pixel to its neighbor. */
+class cProtIntGenRiver:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenRiver(int a_Seed, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying data:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerValues[m_BufferSize];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerSizeX, lowerSizeZ, lowerValues);
+
+		// Detect the edges:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int Above = lowerValues[x + 1 + z       * lowerSizeX];
+				int Below = lowerValues[x + 1 + (z + 2) * lowerSizeX];
+				int Left  = lowerValues[x +     (z + 1) * lowerSizeX];
+				int Right = lowerValues[x + 2 + (z + 1) * lowerSizeX];
+				int val   = lowerValues[x + 1 + (z + 1) * lowerSizeX];
+
+				if ((val == Above) && (val == Below) && (val == Left) && (val == Right))
+				{
+					val = 0;
+				}
+				else
+				{
+					val = biRiver;
+				}
+				a_Values[x + z * a_SizeX] = val;
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Turns some of the oceans into the specified biome. Used for mushroom and deep ocean.
+The biome is only placed if at least 3 of its neighbors are ocean and only with the specified chance. */
+class cProtIntGenAddToOcean:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenAddToOcean(int a_Seed, int a_Chance, int a_ToValue, Underlying a_Underlying):
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_ToValue(a_ToValue),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying data:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerValues[m_BufferSize];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerSizeX, lowerSizeZ, lowerValues);
+
+		// Add the mushroom islands:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int val = lowerValues[x + 1 + (z + 1) * lowerSizeX];
+				if (!IsBiomeOcean(val))
+				{
+					a_Values[x + z * a_SizeX] = val;
+					continue;
+				}
+
+				// Count the ocean neighbors:
+				int Above = lowerValues[x + 1 + z       * lowerSizeX];
+				int Below = lowerValues[x + 1 + (z + 2) * lowerSizeX];
+				int Left  = lowerValues[x +     (z + 1) * lowerSizeX];
+				int Right = lowerValues[x + 2 + (z + 1) * lowerSizeX];
+				int NumOceanNeighbors = 0;
+				if (IsBiomeOcean(Above))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Below))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Left))
+				{
+					NumOceanNeighbors += 1;
+				}
+				if (IsBiomeOcean(Right))
+				{
+					NumOceanNeighbors += 1;
+				}
+
+				// If at least 3 ocean neighbors and the chance is right, change:
+				if (
+					(NumOceanNeighbors >= 3) &&
+					((super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7) % 1000 < m_Chance)
+				)
+				{
+					a_Values[x + z * a_SizeX] = m_ToValue;
+				}
+				else
+				{
+					a_Values[x + z * a_SizeX] = val;
+				}
+			}  // for x
+		}  // for z
+	}
+
+protected:
+	/** Chance, in permille, of changing the biome. */
+	int m_Chance;
+
+	/** The value to change the ocean into. */
+	int m_ToValue;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Changes random pixels of the underlying data to the specified value. */
+class cProtIntGenSetRandomly :
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenSetRandomly(int a_Seed, int a_Chance, int a_ToValue, Underlying a_Underlying) :
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_ToValue(a_ToValue),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying data:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+
+		// Change random pixels to bgOcean:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+				if (rnd % 1000 < m_Chance)
+				{
+					a_Values[x + z * a_SizeX] = m_ToValue;
+				}
+			}
+		}
+	}
+
+protected:
+	/** Chance, in permille, of changing each pixel. */
+	int m_Chance;
+
+	/** The value to which to set the pixel. */
+	int m_ToValue;
+
+	Underlying m_Underlying;
+};
+
+
+
+
+
+
+/** Adds a "rare" flag to random biome groups, based on the given chance. */
+class cProtIntGenRareBiomeGroups:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenRareBiomeGroups(int a_Seed, int a_Chance, Underlying a_Underlying):
+		super(a_Seed),
+		m_Chance(a_Chance),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying data:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+
+		// Change some of the biome groups into rare biome groups:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int rnd = super::m_Noise.IntNoise2DInt(x + a_MinX, z + a_MinZ) / 7;
+				if (rnd % 1000 < m_Chance)
+				{
+					int idx = x + a_SizeX * z;
+					a_Values[idx] = a_Values[idx] | bgfRare;
+				}
+			}
+		}
+	}
+
+protected:
+	/** Chance, in permille, of changing each pixel into the rare biome group. */
+	int m_Chance;
+
+	/** The underlying generator. */
+	Underlying m_Underlying;
+};
+
+
+
+
+
+/** Changes biomes in the parent data into an alternate versions (usually "hill" variants), in such places
+that have their alterations set. */
+class cProtIntGenAlternateBiomes:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenAlternateBiomes(int a_Seed, Underlying a_Alterations, Underlying a_BaseBiomes):
+		super(a_Seed),
+		m_Alterations(a_Alterations),
+		m_BaseBiomes(a_BaseBiomes)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the base biomes and the alterations:
+		m_BaseBiomes->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+		int alterations[m_BufferSize];
+		m_Alterations->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, alterations);
+
+		// Change the biomes into their alternate versions:
+		int len = a_SizeX * a_SizeZ;
+		for (int idx = 0; idx < len; ++idx)
+		{
+			if (alterations[idx] == 0)
+			{
+				// No change
+				continue;
+			}
+
+			// Change to alternate biomes:
+			int val = a_Values[idx];
+			switch (val)
+			{
+				case biBirchForest:   val = biBirchForestHills; break;
+				case biDesert:        val = biDesertHills;      break;
+				case biExtremeHills:  val = biExtremeHillsPlus; break;
+				case biForest:        val = biForestHills;      break;
+				case biIcePlains:     val = biIceMountains;     break;
+				case biJungle:        val = biJungleHills;      break;
+				case biMegaTaiga:     val = biMegaTaigaHills;   break;
+				case biMesaPlateau:   val = biMesa;             break;
+				case biMesaPlateauF:  val = biMesa;             break;
+				case biMesaPlateauM:  val = biMesa;             break;
+				case biMesaPlateauFM: val = biMesa;             break;
+				case biPlains:        val = biForest;           break;
+				case biRoofedForest:  val = biPlains;           break;
+				case biSavanna:       val = biSavannaPlateau;   break;
+				case biTaiga:         val = biTaigaHills;       break;
+			}
+			a_Values[idx] = val;
+		}  // for idx - a_Values[]
+	}
+
+protected:
+	Underlying m_Alterations;
+	Underlying m_BaseBiomes;
+};
+
+
+
+
+
+/** Adds an edge between two specifically incompatible biomes, such as mesa and forest. */
+class cProtIntGenBiomeEdges:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenBiomeEdges(int a_Seed, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying biomes:
+		int lowerSizeX = a_SizeX + 2;
+		int lowerSizeZ = a_SizeZ + 2;
+		ASSERT(lowerSizeX * lowerSizeZ <= m_BufferSize);
+		int lowerValues[m_BufferSize];
+		m_Underlying->GetInts(a_MinX - 1, a_MinZ - 1, lowerSizeX, lowerSizeZ, lowerValues);
+
+		// Convert incompatible edges into neutral biomes:
+		for (int z = 0; z < a_SizeZ; z++)
+		{
+			for (int x = 0; x < a_SizeX; x++)
+			{
+				int biome = lowerValues[x + 1 + (z + 1) * lowerSizeX];
+				int above = lowerValues[x + 1 + z *       lowerSizeX];
+				int below = lowerValues[x + 1 + (z + 2) * lowerSizeX];
+				int left  = lowerValues[x +     (z + 1) * lowerSizeX];
+				int right = lowerValues[x + 2 + (z + 1) * lowerSizeX];
+
+				switch (biome)
+				{
+					case biDesert:
+					case biDesertM:
+					case biDesertHills:
+					{
+						if (
+							IsBiomeVeryCold(static_cast<EMCSBiome>(above)) ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(below)) ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(left))  ||
+							IsBiomeVeryCold(static_cast<EMCSBiome>(right))
+						)
+						{
+							biome = biPlains;
+						}
+						break;
+					}  // case biDesert
+
+					case biMesaPlateau:
+					case biMesaPlateauF:
+					case biMesaPlateauFM:
+					case biMesaPlateauM:
+					{
+						if (
+							!isMesaCompatible(above) ||
+							!isMesaCompatible(below) ||
+							!isMesaCompatible(left)  ||
+							!isMesaCompatible(right)
+						)
+						{
+							biome = biDesert;
+						}
+						break;
+					}  // Mesa biomes
+
+					case biJungle:
+					case biJungleM:
+					{
+						if (
+							!isJungleCompatible(above) ||
+							!isJungleCompatible(below) ||
+							!isJungleCompatible(left)  ||
+							!isJungleCompatible(right)
+						)
+						{
+							biome = (biome == biJungle) ? biJungleEdge : biJungleEdgeM;
+						}
+						break;
+					}  // Jungle biomes
+
+					case biSwampland:
+					case biSwamplandM:
+					{
+						if (
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(above)) ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(below)) ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(left))  ||
+							IsBiomeNoDownfall(static_cast<EMCSBiome>(right))
+						)
+						{
+							biome = biPlains;
+						}
+						break;
+					}  // Swampland biomes
+				}  // switch (biome)
+
+				a_Values[x + z * a_SizeX] = biome;
+			}  // for x
+		}  // for z
+	}
+
+
+protected:
+	Underlying m_Underlying;
+
+
+	bool isMesaCompatible(int a_Biome)
+	{
+		switch (a_Biome)
+		{
+			case biDesert:
+			case biMesa:
+			case biMesaBryce:
+			case biMesaPlateau:
+			case biMesaPlateauF:
+			case biMesaPlateauFM:
+			case biMesaPlateauM:
+			case biOcean:
+			case biDeepOcean:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+
+
+	bool isJungleCompatible(int a_Biome)
+	{
+		switch (a_Biome)
+		{
+			case biJungle:
+			case biJungleM:
+			case biJungleEdge:
+			case biJungleEdgeM:
+			case biJungleHills:
+			{
+				return true;
+			}
+			default:
+			{
+				return false;
+			}
+		}
+	}
+};
+
+
+
+
+
+/** Changes biomes in the parent data into their alternate versions ("M" variants), in such places that
+have their alterations set. */
+class cProtIntGenMBiomes:
+	public cProtIntGenWithNoise
+{
+	typedef cProtIntGenWithNoise super;
+
+public:
+	cProtIntGenMBiomes(int a_Seed, Underlying a_Alteration, Underlying a_Underlying):
+		super(a_Seed),
+		m_Underlying(a_Underlying),
+		m_Alteration(a_Alteration)
+	{
+	}
+
+
+	virtual void GetInts(int a_MinX, int a_MinZ, int a_SizeX, int a_SizeZ, int * a_Values) override
+	{
+		// Generate the underlying biomes and the alterations:
+		m_Underlying->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, a_Values);
+		int alterations[m_BufferSize];
+		m_Alteration->GetInts(a_MinX, a_MinZ, a_SizeX, a_SizeZ, alterations);
+
+		// Wherever alterations are nonzero, change into alternate biome, if available:
+		int len = a_SizeX * a_SizeZ;
+		for (int idx = 0; idx < len; ++idx)
+		{
+			if (alterations[idx] == 0)
+			{
+				continue;
+			}
+
+			// Ice spikes biome was removed from here, because it was generated way too often
+			switch (a_Values[idx])
+			{
+				case biPlains:               a_Values[idx] = biSunflowerPlains;      break;
+				case biDesert:               a_Values[idx] = biDesertM;              break;
+				case biExtremeHills:         a_Values[idx] = biExtremeHillsM;        break;
+				case biForest:               a_Values[idx] = biFlowerForest;         break;
+				case biTaiga:                a_Values[idx] = biTaigaM;               break;
+				case biSwampland:            a_Values[idx] = biSwamplandM;           break;
+				case biJungle:               a_Values[idx] = biJungleM;              break;
+				case biJungleEdge:           a_Values[idx] = biJungleEdgeM;          break;
+				case biBirchForest:          a_Values[idx] = biBirchForestM;         break;
+				case biBirchForestHills:     a_Values[idx] = biBirchForestHillsM;    break;
+				case biRoofedForest:         a_Values[idx] = biRoofedForestM;        break;
+				case biColdTaiga:            a_Values[idx] = biColdTaigaM;           break;
+				case biMegaSpruceTaiga:      a_Values[idx] = biMegaSpruceTaiga;      break;
+				case biMegaSpruceTaigaHills: a_Values[idx] = biMegaSpruceTaigaHills; break;
+				case biExtremeHillsPlus:     a_Values[idx] = biExtremeHillsPlusM;    break;
+				case biSavanna:              a_Values[idx] = biSavannaM;             break;
+				case biSavannaPlateau:       a_Values[idx] = biSavannaPlateauM;      break;
+				case biMesa:                 a_Values[idx] = biMesaBryce;            break;
+				case biMesaPlateauF:         a_Values[idx] = biMesaPlateauFM;        break;
+				case biMesaPlateau:          a_Values[idx] = biMesaBryce;            break;
+			}
+		}  // for idx - a_Values[] / alterations[]
+	}
+
+protected:
+	Underlying m_Underlying;
+	Underlying m_Alteration;
+};
+
+
+
+
diff --git a/src/Generating/StructGen.cpp b/src/Generating/StructGen.cpp
index 731324b0d..bdefcd8c1 100644
--- a/src/Generating/StructGen.cpp
+++ b/src/Generating/StructGen.cpp
@@ -272,13 +272,14 @@ void cStructGenOreNests::GenFinish(cChunkDesc & a_ChunkDesc)
 	int ChunkX = a_ChunkDesc.GetChunkX();
 	int ChunkZ = a_ChunkDesc.GetChunkZ();
 	cChunkDef::BlockTypes & BlockTypes = a_ChunkDesc.GetBlockTypes();
+	cChunkDesc::BlockNibbleBytes & BlockMetas = a_ChunkDesc.GetBlockMetasUncompressed();
 
 	int seq = 1;
 	
 	// Generate the ores from the ore list.
 	for (OreList::const_iterator itr = m_OreList.begin(); itr != m_OreList.end(); ++itr)
 	{
-		GenerateOre(ChunkX, ChunkZ, itr->BlockType, itr->MaxHeight, itr->NumNests, itr->NestSize, BlockTypes, seq);
+		GenerateOre(ChunkX, ChunkZ, itr->BlockType, itr->BlockMeta, itr->MaxHeight, itr->NumNests, itr->NestSize, BlockTypes, BlockMetas, seq);
 		seq++;
 	}
 }
@@ -287,7 +288,7 @@ void cStructGenOreNests::GenFinish(cChunkDesc & a_ChunkDesc)
 
 
 
-void cStructGenOreNests::GenerateOre(int a_ChunkX, int a_ChunkZ, BLOCKTYPE a_OreType, int a_MaxHeight, int a_NumNests, int a_NestSize, cChunkDef::BlockTypes & a_BlockTypes, int a_Seq)
+void cStructGenOreNests::GenerateOre(int a_ChunkX, int a_ChunkZ, BLOCKTYPE a_OreType, NIBBLETYPE a_BlockMeta, int a_MaxHeight, int a_NumNests, int a_NestSize, cChunkDef::BlockTypes & a_BlockTypes, cChunkDesc::BlockNibbleBytes & a_BlockMetas, int a_Seq)
 {
 	// This function generates several "nests" of ore, each nest consisting of number of ore blocks relatively adjacent to each other.
 	// It does so by making a random XYZ walk and adding ore along the way in cuboids of different (random) sizes
@@ -341,6 +342,7 @@ void cStructGenOreNests::GenerateOre(int a_ChunkX, int a_ChunkZ, BLOCKTYPE a_Ore
 						if (a_BlockTypes[Index] == m_ToReplace)
 						{
 							a_BlockTypes[Index] = a_OreType;
+							a_BlockMetas[Index] = a_BlockMeta;
 						}
 						Num++;
 					}  // for z
@@ -409,7 +411,7 @@ void cStructGenLakes::CreateLakeImage(int a_ChunkX, int a_ChunkZ, cBlockArea & a
 	
 	// Find the minimum height in this chunk:
 	cChunkDef::HeightMap HeightMap;
-	m_HeiGen.GenHeightMap(a_ChunkX, a_ChunkZ, HeightMap);
+	m_HeiGen->GenHeightMap(a_ChunkX, a_ChunkZ, HeightMap);
 	HEIGHTTYPE MinHeight = HeightMap[0];
 	for (size_t i = 1; i < ARRAYCOUNT(HeightMap); i++)
 	{
diff --git a/src/Generating/StructGen.h b/src/Generating/StructGen.h
index 55d5bc1c7..906fdd722 100644
--- a/src/Generating/StructGen.h
+++ b/src/Generating/StructGen.h
@@ -24,7 +24,7 @@ class cStructGenTrees :
 	public cFinishGen
 {
 public:
-	cStructGenTrees(int a_Seed, cBiomeGen * a_BiomeGen, cTerrainHeightGen * a_HeightGen, cTerrainCompositionGen * a_CompositionGen) :
+	cStructGenTrees(int a_Seed, cBiomeGenPtr a_BiomeGen, cTerrainHeightGenPtr a_HeightGen, cTerrainCompositionGenPtr a_CompositionGen) :
 		m_Seed(a_Seed),
 		m_Noise(a_Seed),
 		m_BiomeGen(a_BiomeGen),
@@ -36,9 +36,9 @@ protected:
 
 	int m_Seed;
 	cNoise m_Noise;
-	cBiomeGen *              m_BiomeGen;
-	cTerrainHeightGen *      m_HeightGen;
-	cTerrainCompositionGen * m_CompositionGen;
+	cBiomeGenPtr              m_BiomeGen;
+	cTerrainHeightGenPtr      m_HeightGen;
+	cTerrainCompositionGenPtr m_CompositionGen;
 	
 	/** Generates and applies an image of a single tree.
 	Parts of the tree inside the chunk are applied to a_BlockX.
@@ -78,10 +78,20 @@ class cStructGenOreNests :
 public:
 	struct OreInfo
 	{
-		BLOCKTYPE BlockType;  // The type of the nest.
-		int       MaxHeight;  // The highest possible a nest can occur
-		int       NumNests;   // How many nests per chunk
-		int       NestSize;   // The amount of blocks a nest can have.
+		BLOCKTYPE  BlockType;  // The type of the nest.
+		NIBBLETYPE BlockMeta;  // The block meta
+		int        MaxHeight;  // The highest possible a nest can occur
+		int        NumNests;   // How many nests per chunk
+		int        NestSize;   // The amount of blocks a nest can have.
+
+		OreInfo() :
+			BlockType(0),
+			BlockMeta(0),
+			MaxHeight(0),
+			NumNests(0),
+			NestSize(0)
+		{
+		}
 	};
 
 	typedef std::vector<OreInfo> OreList;
@@ -103,7 +113,7 @@ protected:
 	// cFinishGen override:
 	virtual void GenFinish(cChunkDesc & a_ChunkDesc) override;
 	
-	void GenerateOre(int a_ChunkX, int a_ChunkZ, BLOCKTYPE a_OreType, int a_MaxHeight, int a_NumNests, int a_NestSize, cChunkDef::BlockTypes & a_BlockTypes, int a_Seq);
+	void GenerateOre(int a_ChunkX, int a_ChunkZ, BLOCKTYPE a_OreType, NIBBLETYPE a_BlockMeta, int a_MaxHeight, int a_NumNests, int a_NestSize, cChunkDef::BlockTypes & a_BlockTypes, cChunkDesc::BlockNibbleBytes & a_BlockMetas, int a_Seq);
 } ;
 
 
@@ -114,7 +124,7 @@ class cStructGenLakes :
 	public cFinishGen
 {
 public:
-	cStructGenLakes(int a_Seed, BLOCKTYPE a_Fluid, cTerrainHeightGen & a_HeiGen, int a_Probability) :
+	cStructGenLakes(int a_Seed, BLOCKTYPE a_Fluid, cTerrainHeightGenPtr a_HeiGen, int a_Probability) :
 		m_Noise(a_Seed),
 		m_Seed(a_Seed),
 		m_Fluid(a_Fluid),
@@ -124,11 +134,11 @@ public:
 	}
 	
 protected:
-	cNoise              m_Noise;
-	int                 m_Seed;
-	BLOCKTYPE           m_Fluid;
-	cTerrainHeightGen & m_HeiGen;
-	int                 m_Probability;  ///< Chance, 0 .. 100, of a chunk having the lake
+	cNoise               m_Noise;
+	int                  m_Seed;
+	BLOCKTYPE            m_Fluid;
+	cTerrainHeightGenPtr m_HeiGen;
+	int                  m_Probability;  ///< Chance, 0 .. 100, of a chunk having the lake
 	
 	// cFinishGen override:
 	virtual void GenFinish(cChunkDesc & a_ChunkDesc) override;
diff --git a/src/Generating/Trees.cpp b/src/Generating/Trees.cpp
index 1b0f2dc14..7fd6d6f07 100644
--- a/src/Generating/Trees.cpp
+++ b/src/Generating/Trees.cpp
@@ -224,8 +224,6 @@ void GetTreeImageByBiome(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_No
 		case biMegaTaiga:
 		case biMegaTaigaHills:
 		case biExtremeHillsPlus:
-		case biSavanna:
-		case biSavannaPlateau:
 		case biMesa:
 		case biMesaPlateauF:
 		case biMesaPlateau:
@@ -241,8 +239,6 @@ void GetTreeImageByBiome(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_No
 		case biMegaSpruceTaiga:
 		case biMegaSpruceTaigaHills:
 		case biExtremeHillsPlusM:
-		case biSavannaM:
-		case biSavannaPlateauM:
 		case biMesaBryce:
 		case biMesaPlateauFM:
 		case biMesaPlateauM:
@@ -252,6 +248,15 @@ void GetTreeImageByBiome(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_No
 			return;
 		}
 
+		case biSavanna:
+		case biSavannaPlateau:
+		case biSavannaM:
+		case biSavannaPlateauM:
+		{
+			GetAcaciaTreeImage(a_BlockX, a_BlockY, a_BlockZ, a_Noise, a_Seq, a_LogBlocks, a_OtherBlocks);
+			return;
+		}
+
 		case biRoofedForest:
 		case biRoofedForestM:
 		{
@@ -403,7 +408,72 @@ void GetBirchTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Nois
 
 void GetAcaciaTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_LogBlocks, sSetBlockVector & a_OtherBlocks)
 {
-	// TODO
+	// Calculate a base height
+	int Height = 2 + (a_Noise.IntNoise3DInt(a_BlockX, a_BlockY, a_BlockZ) / 11 % 3);
+	
+	// Create the trunk
+	for (int i = 0; i < Height; i++)
+	{
+		a_LogBlocks.push_back(sSetBlock(a_BlockX, a_BlockY + i, a_BlockZ, E_BLOCK_NEW_LOG, E_META_NEW_LOG_ACACIA_WOOD));
+	}
+
+	// Array with possible directions for a branch to go to.
+	const Vector3i AvailableDirections[] =
+	{
+		{ -1, 1, 0 }, { 0, 1, -1 },
+		{ -1, 1, 1 }, { -1, 1, -1 },
+		{ 1, 1, 1 }, { 1, 1, -1 },
+		{ 1, 1, 0 }, { 0, 1, 1 },
+	};
+
+	// Set the starting point of the branch
+	Vector3i BranchPos = Vector3i(a_BlockX, a_BlockY + Height - 1, a_BlockZ);
+
+	// Get a direction for the trunk to go to.
+	Vector3i BranchDirection = AvailableDirections[a_Noise.IntNoise3DInt(a_BlockX, a_BlockY, a_BlockZ) % 8];
+
+	// Calculate a height for the branch between 1 and 3
+	int BranchHeight = a_Noise.IntNoise3DInt(a_BlockX, a_BlockY, a_BlockZ) % 3 + 1;
+
+	// Place the logs of the branch.
+	for (int i = 0; i < BranchHeight; i++)
+	{
+		BranchPos = BranchPos + BranchDirection;
+		a_LogBlocks.push_back(sSetBlock(BranchPos.x, BranchPos.y, BranchPos.z, E_BLOCK_NEW_LOG, E_META_NEW_LOG_ACACIA_WOOD));
+	}
+
+	// Add the leaves to the top of the branch
+	PushCoordBlocks(BranchPos.x, BranchPos.y, BranchPos.z, a_OtherBlocks, BigO2, ARRAYCOUNT(BigO2), E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD);
+	PushCoordBlocks(BranchPos.x, BranchPos.y + 1, BranchPos.z, a_OtherBlocks, BigO1, ARRAYCOUNT(BigO1), E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD);
+	a_OtherBlocks.push_back(sSetBlock(BranchPos.x, BranchPos.y + 1, BranchPos.z, E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD));
+
+	// Choose if we have to add another branch
+	bool TwoTop = (a_Noise.IntNoise3D(a_BlockX, a_BlockY, a_BlockZ) < 0 ? true : false);
+	if (!TwoTop)
+	{
+		return;
+	}
+
+	// Reset the starting point of the branch
+	BranchPos = Vector3i(a_BlockX, a_BlockY + Height - 1, a_BlockZ);
+
+	// Invert the direction of the previous branch.
+	BranchDirection = Vector3d(-BranchDirection.x, 1, -BranchDirection.z);
+
+	// Calculate a new height for the second branch
+	BranchHeight = a_Noise.IntNoise3DInt(a_BlockX * a_Seq, a_BlockY * a_Seq * 10, a_BlockZ * a_Seq) % 3 + 1;
+
+	// Place the logs in the same way as the first branch
+	for (int i = 0; i < BranchHeight; i++)
+	{
+		BranchPos = BranchPos + BranchDirection;
+		a_LogBlocks.push_back(sSetBlock(BranchPos.x, BranchPos.y, BranchPos.z, E_BLOCK_NEW_LOG, E_META_NEW_LOG_ACACIA_WOOD));
+	}
+
+	// And add the leaves ontop of the second branch
+	PushCoordBlocks(BranchPos.x, BranchPos.y, BranchPos.z, a_OtherBlocks, BigO2, ARRAYCOUNT(BigO2), E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD);
+	PushCoordBlocks(BranchPos.x, BranchPos.y + 1, BranchPos.z, a_OtherBlocks, BigO1, ARRAYCOUNT(BigO1), E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD);
+	a_OtherBlocks.push_back(sSetBlock(BranchPos.x, BranchPos.y + 1, BranchPos.z, E_BLOCK_NEW_LEAVES, E_META_NEW_LEAVES_ACACIA_WOOD));
 }
 
 
diff --git a/src/Generating/UnderwaterBaseGen.cpp b/src/Generating/UnderwaterBaseGen.cpp
index 9278ea546..8916f4b5f 100644
--- a/src/Generating/UnderwaterBaseGen.cpp
+++ b/src/Generating/UnderwaterBaseGen.cpp
@@ -93,7 +93,7 @@ protected:
 
 
 
-cUnderwaterBaseGen::cUnderwaterBaseGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, cBiomeGen & a_BiomeGen) :
+cUnderwaterBaseGen::cUnderwaterBaseGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, cBiomeGenPtr a_BiomeGen) :
 	super(a_Seed, a_GridSize, a_GridSize, a_MaxOffset, a_MaxOffset, a_MaxSize, a_MaxSize, 100),
 	m_Noise(a_Seed + 1000),
 	m_MaxDepth(a_MaxDepth),
@@ -112,7 +112,7 @@ cGridStructGen::cStructurePtr cUnderwaterBaseGen::CreateStructure(int a_GridX, i
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_OriginX, a_OriginZ, ChunkX, ChunkZ);
 	cChunkDef::BiomeMap Biomes;
-	m_BiomeGen.GenBiomes(ChunkX, ChunkZ, Biomes);
+	m_BiomeGen->GenBiomes(ChunkX, ChunkZ, Biomes);
 
 	// Check if all the biomes are ocean:
 	// If just one is not, no base is created, because it's likely that an unfriendly biome is too close
diff --git a/src/Generating/UnderwaterBaseGen.h b/src/Generating/UnderwaterBaseGen.h
index d6267b602..b24eb1075 100644
--- a/src/Generating/UnderwaterBaseGen.h
+++ b/src/Generating/UnderwaterBaseGen.h
@@ -22,7 +22,7 @@ class cUnderwaterBaseGen :
 	typedef cGridStructGen super;
 	
 public:
-	cUnderwaterBaseGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, cBiomeGen & a_BiomeGen);
+	cUnderwaterBaseGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, cBiomeGenPtr a_BiomeGen);
 
 protected:
 	class cUnderwaterBase;  // fwd: UnderwaterBaseGen.cpp
@@ -38,7 +38,7 @@ protected:
 	int m_MaxSize;
 	
 	/** The underlying biome generator that defines whether the base is created or not */
-	cBiomeGen & m_BiomeGen;
+	cBiomeGenPtr m_BiomeGen;
 
 
 	// cGridStructGen overrides:
diff --git a/src/Generating/VillageGen.cpp b/src/Generating/VillageGen.cpp
index a7f66b75e..a9b359b6a 100644
--- a/src/Generating/VillageGen.cpp
+++ b/src/Generating/VillageGen.cpp
@@ -116,7 +116,7 @@ public:
 		int a_MaxSize,
 		int a_Density,
 		cPiecePool & a_Prefabs,
-		cTerrainHeightGen & a_HeightGen,
+		cTerrainHeightGenPtr a_HeightGen,
 		BLOCKTYPE a_RoadBlock,
 		BLOCKTYPE a_WaterRoadBlock
 	) :
@@ -175,7 +175,7 @@ protected:
 	cPiecePool & m_Prefabs;
 	
 	/** The underlying height generator, used for placing the structures on top of the terrain. */
-	cTerrainHeightGen & m_HeightGen;
+	cTerrainHeightGenPtr m_HeightGen;
 	
 	/** The village pieces, placed by the generator. */
 	cPlacedPieces m_Pieces;
@@ -194,7 +194,7 @@ protected:
 		// Each intersecting prefab is placed on ground, then drawn
 		// Each intersecting road is drawn by replacing top soil blocks with gravel / sandstone blocks
 		cChunkDef::HeightMap HeightMap;  // Heightmap for this chunk, used by roads
-		m_HeightGen.GenHeightMap(a_Chunk.GetChunkX(), a_Chunk.GetChunkZ(), HeightMap);
+		m_HeightGen->GenHeightMap(a_Chunk.GetChunkX(), a_Chunk.GetChunkZ(), HeightMap);
 		for (cPlacedPieces::iterator itr = m_Pieces.begin(), end = m_Pieces.end(); itr != end; ++itr)
 		{
 			cPrefab & Prefab = (cPrefab &)((*itr)->GetPiece());
@@ -224,7 +224,7 @@ protected:
 		int BlockY;
 		cChunkDef::AbsoluteToRelative(BlockX, BlockY, BlockZ, ChunkX, ChunkZ);
 		cChunkDef::HeightMap HeightMap;
-		m_HeightGen.GenHeightMap(ChunkX, ChunkZ, HeightMap);
+		m_HeightGen->GenHeightMap(ChunkX, ChunkZ, HeightMap);
 		int TerrainHeight = cChunkDef::GetHeight(HeightMap, BlockX, BlockZ);
 		a_Piece.MoveToGroundBy(TerrainHeight - FirstConnector.m_Pos.y + 1);
 	}
@@ -359,7 +359,7 @@ static cVillagePiecePool * g_PlainsVillagePools[] =
 
 
 
-cVillageGen::cVillageGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, int a_MinDensity, int a_MaxDensity, cBiomeGen & a_BiomeGen, cTerrainHeightGen & a_HeightGen) :
+cVillageGen::cVillageGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, int a_MinDensity, int a_MaxDensity, cBiomeGenPtr a_BiomeGen, cTerrainHeightGenPtr a_HeightGen) :
 	super(a_Seed, a_GridSize, a_GridSize, a_MaxOffset, a_MaxOffset, a_MaxSize, a_MaxSize, 100),
 	m_Noise(a_Seed + 1000),
 	m_MaxDepth(a_MaxDepth),
@@ -381,11 +381,11 @@ cGridStructGen::cStructurePtr cVillageGen::CreateStructure(int a_GridX, int a_Gr
 	int ChunkX, ChunkZ;
 	cChunkDef::BlockToChunk(a_OriginX, a_OriginZ, ChunkX, ChunkZ);
 	cChunkDef::BiomeMap Biomes;
-	m_BiomeGen.GenBiomes(ChunkX, ChunkZ, Biomes);
+	m_BiomeGen->GenBiomes(ChunkX, ChunkZ, Biomes);
 
 	// Check if all the biomes are village-friendly:
 	// If just one is not, no village is created, because it's likely that an unfriendly biome is too close
-	cVillagePiecePool * VillagePrefabs = NULL;
+	cVillagePiecePool * VillagePrefabs = nullptr;
 	BLOCKTYPE RoadBlock = E_BLOCK_GRAVEL;
 	BLOCKTYPE WaterRoadBlock = E_BLOCK_PLANKS;
 	int rnd = m_Noise.IntNoise2DInt(a_OriginX, a_OriginZ) / 11;
@@ -432,7 +432,7 @@ cGridStructGen::cStructurePtr cVillageGen::CreateStructure(int a_GridX, int a_Gr
 	}
 	
 	// Create a village based on the chosen prefabs:
-	if (VillagePrefabs == NULL)
+	if (VillagePrefabs == nullptr)
 	{
 		return cStructurePtr();
 	}
diff --git a/src/Generating/VillageGen.h b/src/Generating/VillageGen.h
index 694ea2358..ed8d739df 100644
--- a/src/Generating/VillageGen.h
+++ b/src/Generating/VillageGen.h
@@ -21,7 +21,7 @@ class cVillageGen :
 {
 	typedef cGridStructGen super;
 public:
-	cVillageGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, int a_MinDensity, int a_MaxDensity, cBiomeGen & a_BiomeGen, cTerrainHeightGen & a_HeightGen);
+	cVillageGen(int a_Seed, int a_GridSize, int a_MaxOffset, int a_MaxDepth, int a_MaxSize, int a_MinDensity, int a_MaxDensity, cBiomeGenPtr a_BiomeGen, cTerrainHeightGenPtr a_HeightGen);
 
 protected:
 	class cVillage;  // fwd: VillageGen.cpp
@@ -42,10 +42,10 @@ protected:
 	int m_MaxDensity;
 
 	/** The underlying biome generator that defines whether the village is created or not */
-	cBiomeGen & m_BiomeGen;
+	cBiomeGenPtr m_BiomeGen;
 	
 	/** The underlying height generator, used to position the prefabs crossing chunk borders */
-	cTerrainHeightGen & m_HeightGen;
+	cTerrainHeightGenPtr m_HeightGen;
 
 
 	// cGridStructGen overrides: