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diff --git a/src/Generating/PieceGeneratorBFSTree.cpp b/src/Generating/PieceGeneratorBFSTree.cpp
new file mode 100644
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+++ b/src/Generating/PieceGeneratorBFSTree.cpp
@@ -0,0 +1,345 @@
+
+// PieceGeneratorBFSTree.cpp
+
+// Implements the cPieceGeneratorBFSTree class for generating structures composed of individual "pieces" in a simple tree
+/*
+The generator keeps a pool of currently-open connectors, chooses one at random and tries to place a piece on it,
+thus possibly extending the pool of open connectors with the new piece's ones (like breadth-first search).
+*/
+
+#include "Globals.h"
+#include "PieceGeneratorBFSTree.h"
+#include "VerticalStrategy.h"
+#include "VerticalLimit.h"
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cPieceGeneratorBFSTree:
+
+cPieceGeneratorBFSTree::cPieceGeneratorBFSTree(cPiecePool & a_PiecePool, int a_Seed):
+	m_PiecePool(a_PiecePool),
+	m_Noise(a_Seed),
+	m_Seed(a_Seed)
+{
+}
+
+
+
+
+
+cPlacedPiecePtr cPieceGeneratorBFSTree::PlaceStartingPiece(int a_BlockX, int a_BlockZ, cFreeConnectors & a_OutConnectors)
+{
+	m_PiecePool.Reset();
+	int rnd = m_Noise.IntNoise2DInt(a_BlockX, a_BlockZ) / 7;
+
+	// Choose a random one of the starting pieces:
+	cPieces StartingPieces = m_PiecePool.GetStartingPieces();
+	int Total = 0;
+	for (cPieces::const_iterator itr = StartingPieces.begin(), end = StartingPieces.end(); itr != end; ++itr)
+	{
+		Total += m_PiecePool.GetStartingPieceWeight(**itr);
+	}
+	cPiece * StartingPiece;
+	if (Total > 0)
+	{
+		int Chosen = rnd % Total;
+		StartingPiece = StartingPieces.front();
+		for (cPieces::const_iterator itr = StartingPieces.begin(), end = StartingPieces.end(); itr != end; ++itr)
+		{
+			Chosen -= m_PiecePool.GetStartingPieceWeight(**itr);
+			if (Chosen <= 0)
+			{
+				StartingPiece = *itr;
+				break;
+			}
+		}
+	}
+	else
+	{
+		// All pieces returned zero weight, but we need one to start. Choose with equal chance:
+		StartingPiece = StartingPieces[static_cast<size_t>(rnd) % StartingPieces.size()];
+	}
+	rnd = rnd >> 16;
+
+	// Choose a random supported rotation:
+	int Rotations[4] = {0};
+	int NumRotations = 1;
+	for (size_t i = 1; i < ARRAYCOUNT(Rotations); i++)
+	{
+		if (StartingPiece->CanRotateCCW(static_cast<int>(i)))
+		{
+			Rotations[NumRotations] = static_cast<int>(i);
+			NumRotations += 1;
+		}
+	}
+	int Rotation = Rotations[rnd % NumRotations];
+	int BlockY = StartingPiece->GetStartingPieceHeight(a_BlockX, a_BlockZ);
+	ASSERT(BlockY >= 0);  // The vertical strategy should have been provided and should give valid coords
+
+	cPlacedPiece * res = new cPlacedPiece(nullptr, *StartingPiece, Vector3i(a_BlockX, BlockY, a_BlockZ), Rotation);
+
+	// Place the piece's connectors into a_OutConnectors:
+	const cPiece::cConnectors & Conn = StartingPiece->GetConnectors();
+	for (cPiece::cConnectors::const_iterator itr = Conn.begin(), end = Conn.end(); itr != end; ++itr)
+	{
+		a_OutConnectors.push_back(
+			cFreeConnector(res, StartingPiece->RotateMoveConnector(*itr, Rotation, a_BlockX, BlockY, a_BlockZ))
+		);
+	}
+
+	return cPlacedPiecePtr(res);
+}
+
+
+
+
+
+bool cPieceGeneratorBFSTree::TryPlacePieceAtConnector(
+	const cPlacedPiece & a_ParentPiece,
+	const cPiece::cConnector & a_Connector,
+	cPlacedPieces & a_OutPieces,
+	cPieceGeneratorBFSTree::cFreeConnectors & a_OutConnectors
+)
+{
+	// Get a list of available connections:
+	cConnections Connections;
+	int WantedConnectorType = -a_Connector.m_Type;
+	cPieces AvailablePieces = m_PiecePool.GetPiecesWithConnector(WantedConnectorType);
+	Connections.reserve(AvailablePieces.size());
+	Vector3i ConnPos = cPiece::cConnector::AddDirection(a_Connector.m_Pos, a_Connector.m_Direction);  // The position at which the new connector should be placed - 1 block away from the current connector
+	int WeightTotal = 0;
+	for (cPieces::iterator itrP = AvailablePieces.begin(), endP = AvailablePieces.end(); itrP != endP; ++itrP)
+	{
+		// Get the relative chance of this piece being generated in this path:
+		int Weight = m_PiecePool.GetPieceWeight(a_ParentPiece, a_Connector, **itrP);
+		if (Weight <= 0)
+		{
+			continue;
+		}
+
+		// Try fitting each of the piece's connector:
+		cPiece::cConnectors Connectors = (*itrP)->GetConnectors();
+		auto verticalLimit = (*itrP)->GetVerticalLimit();
+		for (cPiece::cConnectors::iterator itrC = Connectors.begin(), endC = Connectors.end(); itrC != endC; ++itrC)
+		{
+			if (itrC->m_Type != WantedConnectorType)
+			{
+				continue;
+			}
+			// This is a same-type connector, find out how to rotate to it:
+			int NumCCWRotations = cPiece::cConnector::GetNumCCWRotationsToFit(a_Connector.m_Direction, itrC->m_Direction);
+			if ((NumCCWRotations < 0) || !(*itrP)->CanRotateCCW(NumCCWRotations))
+			{
+				// Doesn't support this rotation
+				continue;
+			}
+
+			// Check if the piece's VerticalLimit allows this connection:
+			if ((verticalLimit != nullptr) && (!verticalLimit->CanBeAtHeight(ConnPos.x, ConnPos.z, ConnPos.y - itrC->m_Pos.y)))
+			{
+				continue;
+			}
+
+			if (!CheckConnection(a_Connector, ConnPos, **itrP, *itrC, NumCCWRotations, a_OutPieces))
+			{
+				// Doesn't fit in this rotation
+				continue;
+			}
+			// Fits, add it to list of possibile connections:
+			Connections.push_back(cConnection(**itrP, *itrC, NumCCWRotations, Weight));
+			WeightTotal += Weight;
+		}  // for itrC - Connectors[]
+	}  // for itrP - AvailablePieces[]
+	if (Connections.empty())
+	{
+		// No available connections, bail out
+		return false;
+	}
+	ASSERT(WeightTotal > 0);
+
+	// Choose a random connection from the list, based on the weights:
+	int rnd = (m_Noise.IntNoise3DInt(a_Connector.m_Pos.x, a_Connector.m_Pos.y, a_Connector.m_Pos.z) / 7) % WeightTotal;
+	size_t ChosenIndex = 0;
+	for (cConnections::const_iterator itr = Connections.begin(), end = Connections.end(); itr != end; ++itr, ++ChosenIndex)
+	{
+		rnd -= itr->m_Weight;
+		if (rnd <= 0)
+		{
+			// This is the piece to choose
+			break;
+		}
+	}
+	cConnection & Conn = Connections[ChosenIndex];
+
+	// Place the piece:
+	Vector3i NewPos = Conn.m_Piece->RotatePos(Conn.m_Connector.m_Pos, Conn.m_NumCCWRotations);
+	ConnPos -= NewPos;
+	auto PlacedPiece = cpp14::make_unique<cPlacedPiece>(&a_ParentPiece, *(Conn.m_Piece), ConnPos, Conn.m_NumCCWRotations);
+
+	// Add the new piece's connectors to the list of free connectors:
+	cPiece::cConnectors Connectors = Conn.m_Piece->GetConnectors();
+	for (cPiece::cConnectors::const_iterator itr = Connectors.begin(), end = Connectors.end(); itr != end; ++itr)
+	{
+		if (itr->m_Pos.Equals(Conn.m_Connector.m_Pos))
+		{
+			// This is the connector through which we have been connected to the parent, don't add
+			continue;
+		}
+		a_OutConnectors.push_back(cFreeConnector(PlacedPiece.get(), Conn.m_Piece->RotateMoveConnector(*itr, Conn.m_NumCCWRotations, ConnPos.x, ConnPos.y, ConnPos.z)));
+	}
+	a_OutPieces.push_back(std::move(PlacedPiece));
+
+	return true;
+}
+
+
+
+
+
+bool cPieceGeneratorBFSTree::CheckConnection(
+	const cPiece::cConnector & a_ExistingConnector,
+	const Vector3i & a_ToPos,
+	const cPiece & a_Piece,
+	const cPiece::cConnector & a_NewConnector,
+	int a_NumCCWRotations,
+	const cPlacedPieces & a_OutPieces
+)
+{
+	// For each placed piece, test the hitbox against the new piece:
+	cCuboid RotatedHitBox = a_Piece.RotateHitBoxToConnector(a_NewConnector, a_ToPos, a_NumCCWRotations);
+	RotatedHitBox.Sort();
+	for (cPlacedPieces::const_iterator itr = a_OutPieces.begin(), end = a_OutPieces.end(); itr != end; ++itr)
+	{
+		if ((*itr)->GetHitBox().DoesIntersect(RotatedHitBox))
+		{
+			return false;
+		}
+	}
+	return true;
+}
+
+
+
+
+
+void cPieceGeneratorBFSTree::PlacePieces(int a_BlockX, int a_BlockZ, int a_MaxDepth, cPlacedPieces & a_OutPieces)
+{
+	a_OutPieces.clear();
+	cFreeConnectors ConnectorPool;
+
+	// Place the starting piece:
+	a_OutPieces.push_back(PlaceStartingPiece(a_BlockX, a_BlockZ, ConnectorPool));
+
+	/*
+	// DEBUG:
+	printf("Placed the starting piece at {%d, %d, %d}\n", a_BlockX, a_BlockY, a_BlockZ);
+	cCuboid Hitbox = a_OutPieces[0]->GetHitBox();
+	Hitbox.Sort();
+	printf("  Hitbox: {%d, %d, %d} - {%d, %d, %d} (%d * %d * %d)\n",
+		Hitbox.p1.x, Hitbox.p1.y, Hitbox.p1.z,
+		Hitbox.p2.x, Hitbox.p2.y, Hitbox.p2.z,
+		Hitbox.DifX() + 1, Hitbox.DifY() + 1, Hitbox.DifZ() + 1
+	);
+	DebugConnectorPool(ConnectorPool, 0);
+	//*/
+
+	// Place pieces at the available connectors:
+	/*
+	Instead of removing them one by one from the pool, we process them sequentially and take note of the last
+	processed one. To save on memory, once the number of processed connectors reaches a big number, a chunk
+	of the connectors is removed.
+	*/
+	size_t NumProcessed = 0;
+	while (ConnectorPool.size() > NumProcessed)
+	{
+		cFreeConnector & Conn = ConnectorPool[NumProcessed];
+		if (Conn.m_Piece->GetDepth() < a_MaxDepth)
+		{
+			if (TryPlacePieceAtConnector(*Conn.m_Piece, Conn.m_Connector, a_OutPieces, ConnectorPool))
+			{
+				/*
+				// DEBUG:
+				const cPlacedPiece * NewPiece = a_OutPieces.back();
+				const Vector3i & Coords = NewPiece->GetCoords();
+				printf("Placed a new piece at {%d, %d, %d}, rotation %d\n", Coords.x, Coords.y, Coords.z, NewPiece->GetNumCCWRotations());
+				cCuboid Hitbox = NewPiece->GetHitBox();
+				Hitbox.Sort();
+				printf("  Hitbox: {%d, %d, %d} - {%d, %d, %d} (%d * %d * %d)\n",
+					Hitbox.p1.x, Hitbox.p1.y, Hitbox.p1.z,
+					Hitbox.p2.x, Hitbox.p2.y, Hitbox.p2.z,
+					Hitbox.DifX() + 1, Hitbox.DifY() + 1, Hitbox.DifZ() + 1
+				);
+				DebugConnectorPool(ConnectorPool, NumProcessed + 1);
+				//*/
+			}
+		}
+		NumProcessed++;
+		if (NumProcessed > 1000)
+		{
+			typedef cPieceGeneratorBFSTree::cFreeConnectors::difference_type difType;
+			ConnectorPool.erase(ConnectorPool.begin(), ConnectorPool.begin() + static_cast<difType>(NumProcessed));
+			NumProcessed = 0;
+		}
+	}
+}
+
+
+
+
+
+//*
+// DEBUG:
+void cPieceGeneratorBFSTree::DebugConnectorPool(const cPieceGeneratorBFSTree::cFreeConnectors & a_ConnectorPool, size_t a_NumProcessed)
+{
+	printf("  Connector pool: " SIZE_T_FMT " items\n", a_ConnectorPool.size() - a_NumProcessed);
+	size_t idx = 0;
+
+	typedef cPieceGeneratorBFSTree::cFreeConnectors::difference_type difType;
+
+	for (auto itr = a_ConnectorPool.cbegin() + static_cast<difType>(a_NumProcessed), end = a_ConnectorPool.cend(); itr != end; ++itr, ++idx)
+	{
+		printf("    " SIZE_T_FMT ": {%d, %d, %d}, type %d, direction %s, depth %d\n",
+			idx,
+			itr->m_Connector.m_Pos.x, itr->m_Connector.m_Pos.y, itr->m_Connector.m_Pos.z,
+			itr->m_Connector.m_Type,
+			cPiece::cConnector::DirectionToString(itr->m_Connector.m_Direction),
+			itr->m_Piece->GetDepth()
+		);
+	}  // for itr - a_ConnectorPool[]
+}
+//*/
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cPieceGeneratorBFSTree::cConnection:
+
+cPieceGeneratorBFSTree::cConnection::cConnection(cPiece & a_Piece, cPiece::cConnector & a_Connector, int a_NumCCWRotations, int a_Weight) :
+	m_Piece(&a_Piece),
+	m_Connector(a_Connector),
+	m_NumCCWRotations(a_NumCCWRotations),
+	m_Weight(a_Weight)
+{
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cPieceGeneratorBFSTree::cFreeConnector:
+
+cPieceGeneratorBFSTree::cFreeConnector::cFreeConnector(cPlacedPiece * a_Piece, const cPiece::cConnector & a_Connector) :
+	m_Piece(a_Piece),
+	m_Connector(a_Connector)
+{
+}
+
+
+
+