21 files changed, 317 insertions, 195 deletions
diff --git a/src/Entities/ArrowEntity.cpp b/src/Entities/ArrowEntity.cpp
index 3c1fabb1b..32952100c 100644
--- a/src/Entities/ArrowEntity.cpp
+++ b/src/Entities/ArrowEntity.cpp
@@ -21,6 +21,8 @@ cArrowEntity::cArrowEntity(cEntity * a_Creator, double a_X, double a_Y, double a
 {
 	SetSpeed(a_Speed);
 	SetMass(0.1);
+	SetGravity(-20.0f);
+	SetAirDrag(0.2f);
 	SetYawFromSpeed();
 	SetPitchFromSpeed();
 	LOGD("Created arrow %d with speed {%.02f, %.02f, %.02f} and rot {%.02f, %.02f}",
@@ -48,6 +50,8 @@ cArrowEntity::cArrowEntity(cPlayer & a_Player, double a_Force) :
 	{
 		m_PickupState = psInCreative;
 	}
+	SetGravity(-20.0f);
+	SetAirDrag(0.01f);
 }
 
 
diff --git a/src/Entities/Boat.cpp b/src/Entities/Boat.cpp
index 6177eb32f..4ad418be4 100644
--- a/src/Entities/Boat.cpp
+++ b/src/Entities/Boat.cpp
@@ -16,7 +16,9 @@
 cBoat::cBoat(double a_X, double a_Y, double a_Z) :
 	super(etBoat, a_X, a_Y, a_Z, 0.98, 0.7)
 {
-	SetMass(20.f);
+	SetMass(20.0f);
+	SetGravity(-16.0f);
+	SetAirDrag(0.05f);
 	SetMaxHealth(6);
 	SetHealth(6);
 }
diff --git a/src/Entities/Entity.cpp b/src/Entities/Entity.cpp
index c8df6b4b1..dca44488b 100644
--- a/src/Entities/Entity.cpp
+++ b/src/Entities/Entity.cpp
@@ -36,6 +36,7 @@ cEntity::cEntity(eEntityType a_EntityType, double a_X, double a_Y, double a_Z, d
 	m_bHasSentNoSpeed(true),
 	m_bOnGround(false),
 	m_Gravity(-9.81f),
+	m_AirDrag(0.02f),
 	m_LastPos(a_X, a_Y, a_Z),
 	m_IsInitialized(false),
 	m_WorldTravellingFrom(nullptr),
@@ -246,7 +247,6 @@ void cEntity::TakeDamage(eDamageType a_DamageType, cEntity * a_Attacker, int a_R
 	if (a_Attacker != nullptr)
 	{
 		Heading = a_Attacker->GetLookVector() * (a_Attacker->IsSprinting() ? 16 : 11);
-		Heading.y = 1.6;
 	}
 
 	TDI.Knockback = Heading * a_KnockbackAmount;
@@ -943,6 +943,7 @@ void cEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 		{
 			// Normal gravity
 			fallspeed = m_Gravity * DtSec.count();
+			NextSpeed -= NextSpeed * (m_AirDrag * 20.0f) * DtSec.count();
 		}
 		NextSpeed.y += static_cast<float>(fallspeed);
 	}
@@ -999,7 +1000,7 @@ void cEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 
 	NextSpeed += m_WaterSpeed;
 
-	if (NextSpeed.SqrLength() > 0.f)
+	if (NextSpeed.SqrLength() > 0.0f)
 	{
 		cTracer Tracer(GetWorld());
 		// Distance traced is an integer, so we round up from the distance we should go (Speed * Delta), else we will encounter collision detection failurse
@@ -1015,20 +1016,20 @@ void cEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 				// Block hit was within our projected path
 				// Begin by stopping movement in the direction that we hit something. The Normal is the line perpendicular to a 2D face and in this case, stores what block face was hit through either -1 or 1.
 				// For example: HitNormal.y = -1 : BLOCK_FACE_YM; HitNormal.y = 1 : BLOCK_FACE_YP
-				if (Tracer.HitNormal.x != 0.f)
+				if (Tracer.HitNormal.x != 0.0f)
 				{
-					NextSpeed.x = 0.f;
+					NextSpeed.x = 0.0f;
 				}
-				if (Tracer.HitNormal.y != 0.f)
+				if (Tracer.HitNormal.y != 0.0f)
 				{
-					NextSpeed.y = 0.f;
+					NextSpeed.y = 0.0f;
 				}
-				if (Tracer.HitNormal.z != 0.f)
+				if (Tracer.HitNormal.z != 0.0f)
 				{
-					NextSpeed.z = 0.f;
+					NextSpeed.z = 0.0f;
 				}
 
-				if (Tracer.HitNormal.y == 1.f)  // Hit BLOCK_FACE_YP, we are on the ground
+				if (Tracer.HitNormal.y == 1.0f)  // Hit BLOCK_FACE_YP, we are on the ground
 				{
 					m_bOnGround = true;
 				}
@@ -1308,7 +1309,8 @@ bool cEntity::DetectPortal()
 
 					if (IsPlayer())
 					{
-						((cPlayer *)this)->GetClientHandle()->SendRespawn(dimOverworld);  // Send a respawn packet before world is loaded/generated so the client isn't left in limbo
+						// Send a respawn packet before world is loaded / generated so the client isn't left in limbo
+						((cPlayer *)this)->GetClientHandle()->SendRespawn(dimOverworld);
 					}
 					
 					return MoveToWorld(cRoot::Get()->CreateAndInitializeWorld(GetWorld()->GetLinkedOverworldName()), false);
@@ -1401,14 +1403,25 @@ bool cEntity::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		return false;
 	}
 
+	//  Ask the plugins if the entity is allowed to changing the world
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangingWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the entity to changing the world
+		return false;
+	}
+
 	// Remove all links to the old world
 	SetWorldTravellingFrom(GetWorld());  // cChunk::Tick() handles entity removal
 	GetWorld()->BroadcastDestroyEntity(*this);
 
 	// Queue add to new world
 	a_World->AddEntity(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);
 
+	// Entity changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }
 
@@ -1687,8 +1700,8 @@ void cEntity::BroadcastMovementUpdate(const cClientHandle * a_Exclude)
 				{
 					m_World->BroadcastEntityRelMove(*this, (char)DiffX, (char)DiffY, (char)DiffZ, a_Exclude);
 				}
-				// Clients seem to store two positions, one for the velocity packet and one for the teleport/relmove packet
-				// The latter is only changed with a relmove/teleport, and m_LastPos stores this position
+				// Clients seem to store two positions, one for the velocity packet and one for the teleport / relmove packet
+				// The latter is only changed with a relmove / teleport, and m_LastPos stores this position
 				m_LastPos = GetPosition();
 			}
 			else
@@ -1971,7 +1984,7 @@ void cEntity::SteerVehicle(float a_Forward, float a_Sideways)
 	{
 		return;
 	}
-	if ((a_Forward != 0.f) || (a_Sideways != 0.f))
+	if ((a_Forward != 0.0f) || (a_Sideways != 0.0f))
 	{
 		m_AttachedTo->HandleSpeedFromAttachee(a_Forward, a_Sideways);
 	}
diff --git a/src/Entities/Entity.h b/src/Entities/Entity.h
index 9bb1837f1..fecbb9bf5 100644
--- a/src/Entities/Entity.h
+++ b/src/Entities/Entity.h
@@ -270,6 +270,10 @@ public:
 	float GetGravity(void) const { return m_Gravity; }
 	
 	void SetGravity(float a_Gravity) { m_Gravity = a_Gravity; }
+
+	float GetAirDrag(void) const { return m_AirDrag; }
+
+	void SetAirDrag(float a_AirDrag) { m_AirDrag = a_AirDrag; }
 	
 	/// Sets the rotation to match the speed vector (entity goes "face-forward")
 	void SetYawFromSpeed(void);
@@ -470,7 +474,7 @@ protected:
 	static cCriticalSection m_CSCount;
 	static UInt32 m_EntityCount;
 	
-	/** Measured in meter/second (m/s) */
+	/** Measured in meters / second (m / s) */
 	Vector3d m_Speed;
 
 	/** The ID of the entity that is guaranteed to be unique within a single run of the server.
@@ -490,7 +494,7 @@ protected:
 	/** Stores whether head yaw has been set manually */
 	bool m_bDirtyHead;
 	
-	/** Stores whether our yaw/pitch/roll (body orientation) has been set manually */
+	/** Stores whether our yaw / pitch / roll (body orientation) has been set manually */
 	bool m_bDirtyOrientation;
 	
 	/** Stores whether we have sent a Velocity packet with a speed of zero (no speed) to the client
@@ -504,6 +508,12 @@ protected:
 	For realistic effects, this should be negative. For spaaaaaaace, this can be zero or even positive */
 	float m_Gravity;
 	
+	/** Stores the air drag that is applied to the entity every tick, measured in speed ratio per tick
+	Acts as air friction and slows down flight
+	Will be interpolated if the server tick rate varies
+	Data: http://minecraft.gamepedia.com/Entity#Motion_of_entities */
+	float m_AirDrag;
+
 	/** Last position sent to client via the Relative Move or Teleport packets (not Velocity)
 	Only updated if cEntity::BroadcastMovementUpdate() is called! */
 	Vector3d m_LastPos;
diff --git a/src/Entities/EntityEffect.cpp b/src/Entities/EntityEffect.cpp
index bae686b77..c8be414d4 100644
--- a/src/Entities/EntityEffect.cpp
+++ b/src/Entities/EntityEffect.cpp
@@ -102,11 +102,11 @@ int cEntityEffect::GetPotionEffectDuration(short a_ItemDamage)
 	// If potion is level II, half the duration. If not, stays the same
 	TierCoeff = (GetPotionEffectIntensity(a_ItemDamage) > 0) ? 0.5 : 1;
 	
-	// If potion is extended, multiply duration by 8/3. If not, stays the same
+	// If potion is extended, multiply duration by 8 / 3. If not, stays the same
 	// Extended potion if sixth lowest bit is set
 	ExtCoeff = (a_ItemDamage & 0x40) ? (8.0 / 3.0) : 1;
 	
-	// If potion is splash potion, multiply duration by 3/4. If not, stays the same
+	// If potion is splash potion, multiply duration by 3 / 4. If not, stays the same
 	SplashCoeff = IsPotionDrinkable(a_ItemDamage) ? 1 : 0.75;
 	
 	// Ref.:
diff --git a/src/Entities/FallingBlock.cpp b/src/Entities/FallingBlock.cpp
index 7301a3c9d..4a165909a 100644
--- a/src/Entities/FallingBlock.cpp
+++ b/src/Entities/FallingBlock.cpp
@@ -16,6 +16,8 @@ cFallingBlock::cFallingBlock(const Vector3i & a_BlockPosition, BLOCKTYPE a_Block
 	m_BlockMeta(a_BlockMeta),
 	m_OriginalPosition(a_BlockPosition)
 {
+	SetGravity(-16.0f);
+	SetAirDrag(0.02f);
 }
 
 
diff --git a/src/Entities/FireChargeEntity.cpp b/src/Entities/FireChargeEntity.cpp
index aba32602f..f6c665156 100644
--- a/src/Entities/FireChargeEntity.cpp
+++ b/src/Entities/FireChargeEntity.cpp
@@ -12,6 +12,7 @@ cFireChargeEntity::cFireChargeEntity(cEntity * a_Creator, double a_X, double a_Y
 {
 	SetSpeed(a_Speed);
 	SetGravity(0);
+	SetAirDrag(0);
 }
 
 
diff --git a/src/Entities/FireworkEntity.cpp b/src/Entities/FireworkEntity.cpp
index 32eaf669a..89f69f113 100644
--- a/src/Entities/FireworkEntity.cpp
+++ b/src/Entities/FireworkEntity.cpp
@@ -13,6 +13,8 @@ cFireworkEntity::cFireworkEntity(cEntity * a_Creator, double a_X, double a_Y, do
 	m_TicksToExplosion(a_Item.m_FireworkItem.m_FlightTimeInTicks),
 	m_FireworkItem(a_Item)
 {
+	SetGravity(0);
+	SetAirDrag(0);
 }
 
 
diff --git a/src/Entities/Floater.cpp b/src/Entities/Floater.cpp
index cf8dd6c6f..0c868270d 100644
--- a/src/Entities/Floater.cpp
+++ b/src/Entities/Floater.cpp
@@ -6,7 +6,7 @@
 #include "Floater.h"
 #include "Player.h"
 #include "../ClientHandle.h"
-
+#include "Broadcaster.h"
 
 
 
@@ -145,12 +145,12 @@ void cFloater::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 			{
 				LOGD("Started producing particles for floater %i", GetUniqueID());
 				m_ParticlePos.Set(GetPosX() + (-4 + m_World->GetTickRandomNumber(8)), GetPosY(), GetPosZ() + (-4 + m_World->GetTickRandomNumber(8)));
-				m_World->BroadcastParticleEffect("splash", (float) m_ParticlePos.x, (float) m_ParticlePos.y, (float) m_ParticlePos.z, 0, 0, 0, 0, 15);
+				m_World->GetBroadcaster().BroadcastParticleEffect("splash", static_cast<Vector3f>(m_ParticlePos), Vector3f{}, 0, 15);
 			}
 			else if (m_CountDownTime < 20)
 			{
 				m_ParticlePos = (m_ParticlePos + (GetPosition() - m_ParticlePos) / 6);
-				m_World->BroadcastParticleEffect("splash", (float) m_ParticlePos.x, (float) m_ParticlePos.y, (float) m_ParticlePos.z, 0, 0, 0, 0, 15);
+				m_World->GetBroadcaster().BroadcastParticleEffect("splash", static_cast<Vector3f>(m_ParticlePos), Vector3f{}, 0, 15);
 			}
 			
 			m_CountDownTime--;
diff --git a/src/Entities/GhastFireballEntity.cpp b/src/Entities/GhastFireballEntity.cpp
index 9e4cb387e..c64fb2a17 100644
--- a/src/Entities/GhastFireballEntity.cpp
+++ b/src/Entities/GhastFireballEntity.cpp
@@ -12,6 +12,7 @@ cGhastFireballEntity::cGhastFireballEntity(cEntity * a_Creator, double a_X, doub
 {
 	SetSpeed(a_Speed);
 	SetGravity(0);
+	SetAirDrag(0);
 }
 
 
diff --git a/src/Entities/HangingEntity.h b/src/Entities/HangingEntity.h
index 507502ac6..9d783006c 100644
--- a/src/Entities/HangingEntity.h
+++ b/src/Entities/HangingEntity.h
@@ -27,7 +27,10 @@ public:
 	eBlockFace GetFacing() const { return cHangingEntity::ProtocolFaceToBlockFace(m_Facing); }
 
 	/** Set the direction in which the entity is facing. */
-	void SetFacing(eBlockFace a_Facing) { m_Facing = cHangingEntity::BlockFaceToProtocolFace(a_Facing); }
+	void SetFacing(eBlockFace a_Facing)
+	{
+		m_Facing = cHangingEntity::BlockFaceToProtocolFace(a_Facing);
+	}
 
 	// tolua_end
 
@@ -37,7 +40,7 @@ public:
 	/** Set the direction in which the entity is facing. */
 	void SetProtocolFacing(Byte a_Facing)
 	{
-		ASSERT((a_Facing <= 3) && (a_Facing >= 0));
+		ASSERT(a_Facing <= 3);
 		m_Facing = a_Facing;
 	}
 
diff --git a/src/Entities/Minecart.cpp b/src/Entities/Minecart.cpp
index ee10cf6b3..b80759d24 100644
--- a/src/Entities/Minecart.cpp
+++ b/src/Entities/Minecart.cpp
@@ -92,7 +92,9 @@ cMinecart::cMinecart(ePayload a_Payload, double a_X, double a_Y, double a_Z) :
 	m_DetectorRailPosition(0, 0, 0),
 	m_bIsOnDetectorRail(false)
 {
-	SetMass(20.f);
+	SetMass(20.0f);
+	SetGravity(-16.0f);
+	SetAirDrag(0.05f);
 	SetMaxHealth(6);
 	SetHealth(6);
 	SetWidth(1);
@@ -903,7 +905,7 @@ bool cMinecart::TestEntityCollision(NIBBLETYPE a_RailMeta)
 			}
 
 			/* Check to which side the minecart is to be pushed.
-			Let's consider a z-x-coordinate system where the minecart is the center (0/0).
+			Let's consider a z-x-coordinate system where the minecart is the center (0, 0).
 			The minecart moves along the line x = -z, the perpendicular line to this is x = z.
 			In order to decide to which side the minecart is to be pushed, it must be checked on what side of the perpendicular line the pushing entity is located. */
 			if (
@@ -952,7 +954,7 @@ bool cMinecart::TestEntityCollision(NIBBLETYPE a_RailMeta)
 			}
 
 			/* Check to which side the minecart is to be pushed.
-			Let's consider a z-x-coordinate system where the minecart is the center (0/0).
+			Let's consider a z-x-coordinate system where the minecart is the center (0, 0).
 			The minecart moves along the line x = z, the perpendicular line to this is x = -z.
 			In order to decide to which side the minecart is to be pushed, it must be checked on what side of the perpendicular line the pushing entity is located. */
 			if (
diff --git a/src/Entities/Minecart.h b/src/Entities/Minecart.h
index 898776e71..05eaf16e9 100644
--- a/src/Entities/Minecart.h
+++ b/src/Entities/Minecart.h
@@ -29,7 +29,7 @@ public:
 	enum ePayload
 	{
 		mpNone    = 0,  // Empty minecart, ridable by player or mobs
-		mpChest   = 1,  // Minecart-with-chest, can store a grid of 3*8 items
+		mpChest   = 1,  // Minecart-with-chest, can store a grid of 3 * 8 items
 		mpFurnace = 2,  // Minecart-with-furnace, can be powered
 		mpTNT     = 3,  // Minecart-with-TNT, can be blown up with activator rail
 		mpHopper  = 5,  // Minecart-with-hopper, can be hopper
@@ -54,8 +54,7 @@ protected:
 	cMinecart(ePayload a_Payload, double a_X, double a_Y, double a_Z);
 
 	/** Handles physics on normal rails
-		For each tick, slow down on flat rails, speed up or slow down on ascending/descending rails (depending on direction), and turn on curved rails
-	*/
+	For each tick, slow down on flat rails, speed up or slow down on ascending / descending rails (depending on direction), and turn on curved rails. */
 	void HandleRailPhysics(NIBBLETYPE a_RailMeta, std::chrono::milliseconds a_Dt);
 
 	/** Handles powered rail physics
@@ -136,7 +135,7 @@ protected:
 	virtual void Destroyed() override;
 
 	// cItemGrid::cListener overrides:
-	virtual void OnSlotChanged(cItemGrid * a_Grid, int a_SlotNum)
+	virtual void OnSlotChanged(cItemGrid * a_Grid, int a_SlotNum) override
 	{
 		UNUSED(a_SlotNum);
 		ASSERT(a_Grid == &m_Contents);
diff --git a/src/Entities/Pawn.cpp b/src/Entities/Pawn.cpp
index baf8a2f3b..fcb686e28 100644
--- a/src/Entities/Pawn.cpp
+++ b/src/Entities/Pawn.cpp
@@ -13,6 +13,8 @@ cPawn::cPawn(eEntityType a_EntityType, double a_Width, double a_Height) :
 	super(a_EntityType, 0, 0, 0, a_Width, a_Height)
 	, m_EntityEffects(tEffectMap())
 {
+	SetGravity(-32.0f);
+	SetAirDrag(0.02f);
 }
 
 
diff --git a/src/Entities/Pickup.cpp b/src/Entities/Pickup.cpp
index 9f2609894..f2f76dbf9 100644
--- a/src/Entities/Pickup.cpp
+++ b/src/Entities/Pickup.cpp
@@ -91,7 +91,8 @@ cPickup::cPickup(double a_PosX, double a_PosY, double a_PosZ, const cItem & a_It
 	, m_bCollected(false)
 	, m_bIsPlayerCreated(IsPlayerCreated)
 {
-	SetGravity(-10.5f);
+	SetGravity(-16.0f);
+	SetAirDrag(0.02f);
 	SetMaxHealth(5);
 	SetHealth(5);
 	SetSpeed(a_SpeedX, a_SpeedY, a_SpeedZ);
diff --git a/src/Entities/Player.cpp b/src/Entities/Player.cpp
index c89e7b87c..e3e3fac4f 100644
--- a/src/Entities/Player.cpp
+++ b/src/Entities/Player.cpp
@@ -94,7 +94,7 @@ cPlayer::cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName) :
 
 	SetMaxHealth(MAX_HEALTH);
 	m_Health = MAX_HEALTH;
-	
+
 	m_LastPlayerListTime = std::chrono::steady_clock::now();
 	m_PlayerName = a_PlayerName;
 
@@ -106,7 +106,7 @@ cPlayer::cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName) :
 		SetPosY(World->GetSpawnY());
 		SetPosZ(World->GetSpawnZ());
 		SetBedPos(Vector3i(static_cast<int>(World->GetSpawnX()), static_cast<int>(World->GetSpawnY()), static_cast<int>(World->GetSpawnZ())));
-		
+
 		LOGD("Player \"%s\" is connecting for the first time, spawning at default world spawn {%.2f, %.2f, %.2f}",
 			a_PlayerName.c_str(), GetPosX(), GetPosY(), GetPosZ()
 		);
@@ -128,7 +128,14 @@ cPlayer::cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName) :
 			m_IsFlying = true;
 		}
 	}
-	
+
+	if (m_GameMode == gmSpectator)  // If player is reconnecting to the server in spectator mode
+	{
+		m_CanFly = true;
+		m_IsFlying = true;
+		m_bVisible = false;
+	}
+
 	cRoot::Get()->GetServer()->PlayerCreated(this);
 }
 
@@ -145,17 +152,17 @@ cPlayer::~cPlayer(void)
 	}
 
 	LOGD("Deleting cPlayer \"%s\" at %p, ID %d", GetName().c_str(), this, GetUniqueID());
-	
+
 	// Notify the server that the player is being destroyed
 	cRoot::Get()->GetServer()->PlayerDestroying(this);
 
 	SaveToDisk();
 
 	m_ClientHandle = nullptr;
-	
+
 	delete m_InventoryWindow;
 	m_InventoryWindow = nullptr;
-	
+
 	LOGD("Player %p deleted", this);
 }
 
@@ -201,7 +208,7 @@ void cPlayer::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 			m_ClientHandle = nullptr;
 			return;
 		}
-		
+
 		if (!m_ClientHandle->IsPlaying())
 		{
 			// We're not yet in the game, ignore everything
@@ -210,21 +217,21 @@ void cPlayer::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 	}
 
 	m_Stats.AddValue(statMinutesPlayed, 1);
-	
+
 	if (!a_Chunk.IsValid())
 	{
 		// This may happen if the cPlayer is created before the chunks have the chance of being loaded / generated (#83)
 		return;
 	}
-	
+
 	super::Tick(a_Dt, a_Chunk);
-	
+
 	// Handle charging the bow:
 	if (m_IsChargingBow)
 	{
 		m_BowCharge += 1;
 	}
-	
+
 	// Handle updating experience
 	if (m_bDirtyExperience)
 	{
@@ -236,7 +243,7 @@ void cPlayer::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 	{
 		// Apply food exhaustion from movement:
 		ApplyFoodExhaustionFromMovement();
-		
+
 		if (cRoot::Get()->GetPluginManager()->CallHookPlayerMoving(*this, m_LastPos, GetPosition()))
 		{
 			CanMove = false;
@@ -257,10 +264,10 @@ void cPlayer::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
 		{
 			FinishEating();
 		}
-		
+
 		HandleFood();
 	}
-	
+
 	if (m_IsFishing)
 	{
 		HandleFloater();
@@ -355,7 +362,7 @@ float cPlayer::GetXpPercentage()
 	int currentLevel_XpBase = XpForLevel(currentLevel);
 
 	return static_cast<float>(m_CurrentXp - currentLevel_XpBase) /
-		static_cast<float>(XpForLevel(1+currentLevel) - currentLevel_XpBase);
+		static_cast<float>(XpForLevel(1 + currentLevel) - currentLevel_XpBase);
 }
 
 
@@ -364,7 +371,7 @@ float cPlayer::GetXpPercentage()
 
 bool cPlayer::SetCurrentExperience(int a_CurrentXp)
 {
-	if (!(a_CurrentXp >= 0) || (a_CurrentXp > (std::numeric_limits<int>().max() - m_LifetimeTotalXp)))
+	if (!(a_CurrentXp >= 0) || (a_CurrentXp > (std::numeric_limits<int>::max() - m_LifetimeTotalXp)))
 	{
 		LOGWARNING("Tried to update experiece with an invalid Xp value: %d", a_CurrentXp);
 		return false;  // oops, they gave us a dodgey number
@@ -403,7 +410,7 @@ int cPlayer::DeltaExperience(int a_Xp_delta)
 		m_LifetimeTotalXp += a_Xp_delta;
 	}
 
-	LOGD("Player \"%s\" gained/lost %d experience, total is now: %d", GetName().c_str(), a_Xp_delta, m_CurrentXp);
+	LOGD("Player \"%s\" gained / lost %d experience, total is now: %d", GetName().c_str(), a_Xp_delta, m_CurrentXp);
 
 	// Set experience to be updated
 	m_bDirtyExperience = true;
@@ -460,7 +467,7 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
 	{
 		return;
 	}
-	
+
 	m_bTouchGround = a_bTouchGround;
 
 	if (!m_bTouchGround)
@@ -509,7 +516,7 @@ void cPlayer::SetTouchGround(bool a_bTouchGround)
 		{
 			// cPlayer makes sure damage isn't applied in creative, no need to check here
 			TakeDamage(dtFalling, nullptr, Damage, Damage, 0);
-			
+
 			// Fall particles
 			GetWorld()->BroadcastSoundParticleEffect(2006, POSX_TOINT, static_cast<int>(GetPosY()) - 1, POSZ_TOINT, Damage /* Used as particle effect speed modifier */);
 		}
@@ -541,7 +548,7 @@ void cPlayer::SetFoodLevel(int a_FoodLevel)
 		m_FoodSaturationLevel = 5.0;
 		return;
 	}
-	
+
 	m_FoodLevel = FoodLevel;
 	SendHealth();
 }
@@ -609,7 +616,7 @@ void cPlayer::StartEating(void)
 {
 	// Set the timer:
 	m_EatingFinishTick = m_World->GetWorldAge() + EATING_TICKS;
-	
+
 	// Send the packets:
 	m_World->BroadcastEntityAnimation(*this, 3);
 	m_World->BroadcastEntityMetadata(*this);
@@ -623,7 +630,7 @@ void cPlayer::FinishEating(void)
 {
 	// Reset the timer:
 	m_EatingFinishTick = -1;
-	
+
 	// Send the packets:
 	m_ClientHandle->SendEntityStatus(*this, esPlayerEatingAccepted);
 	m_World->BroadcastEntityMetadata(*this);
@@ -757,7 +764,7 @@ void cPlayer::SetSprintingMaxSpeed(double a_Speed)
 void cPlayer::SetFlyingMaxSpeed(double a_Speed)
 {
 	m_FlyingMaxSpeed = a_Speed;
-	
+
 	// Update the flying speed, always:
 	m_ClientHandle->SendPlayerAbilities();
 }
@@ -769,7 +776,7 @@ void cPlayer::SetFlyingMaxSpeed(double a_Speed)
 void cPlayer::SetCrouch(bool a_IsCrouched)
 {
 	// Set the crouch status, broadcast to all visible players
-	
+
 	if (a_IsCrouched == m_IsCrouched)
 	{
 		// No change
@@ -790,7 +797,7 @@ void cPlayer::SetSprint(bool a_IsSprinting)
 		// No change
 		return;
 	}
-	
+
 	m_IsSprinting = a_IsSprinting;
 	m_ClientHandle->SendPlayerMaxSpeed();
 }
@@ -876,7 +883,7 @@ bool cPlayer::DoTakeDamage(TakeDamageInfo & a_TDI)
 			}
 		}
 	}
-	
+
 	if (super::DoTakeDamage(a_TDI))
 	{
 		// Any kind of damage adds food exhaustion
@@ -1005,7 +1012,7 @@ void cPlayer::Respawn(void)
 
 	m_Health = GetMaxHealth();
 	SetInvulnerableTicks(20);
-	
+
 	// Reset food level:
 	m_FoodLevel = MAX_FOOD_LEVEL;
 	m_FoodSaturationLevel = 5.0;
@@ -1017,7 +1024,7 @@ void cPlayer::Respawn(void)
 	// ToDo: send score to client? How?
 
 	m_ClientHandle->SendRespawn(GetWorld()->GetDimension(), true);
-	
+
 	// Extinguish the fire:
 	StopBurning();
 
@@ -1151,7 +1158,7 @@ void cPlayer::CloseWindow(bool a_CanRefuse)
 		m_CurrentWindow = m_InventoryWindow;
 		return;
 	}
-	
+
 	if (m_CurrentWindow->ClosedByPlayer(*this, a_CanRefuse) || !a_CanRefuse)
 	{
 		// Close accepted, go back to inventory window (the default):
@@ -1189,21 +1196,17 @@ void cPlayer::SetGameMode(eGameMode a_GameMode)
 		LOGWARNING("%s: Setting invalid gamemode: %d", GetName().c_str(), a_GameMode);
 		return;
 	}
-	
+
 	if (m_GameMode == a_GameMode)
 	{
 		// Gamemode already set
 		return;
 	}
-	
+
 	m_GameMode = a_GameMode;
 	m_ClientHandle->SendGameMode(a_GameMode);
 
-	if (!(IsGameModeCreative() || IsGameModeSpectator()))
-	{
-		SetFlying(false);
-		SetCanFly(false);
-	}
+	SetCapabilities();
 
 	m_World->BroadcastPlayerListUpdateGameMode(*this);
 }
@@ -1215,6 +1218,30 @@ void cPlayer::SetGameMode(eGameMode a_GameMode)
 void cPlayer::LoginSetGameMode( eGameMode a_GameMode)
 {
 	m_GameMode = a_GameMode;
+
+	SetCapabilities();
+}
+
+
+
+
+
+void cPlayer::SetCapabilities()
+{
+	if (!IsGameModeCreative() || IsGameModeSpectator())
+	{
+		SetFlying(false);
+		SetCanFly(false);
+	}
+
+	if (IsGameModeSpectator())
+	{
+		SetVisible(false);
+	}
+	else
+	{
+		SetVisible(true);
+	}
 }
 
 
@@ -1306,12 +1333,12 @@ void cPlayer::SendRotation(double a_YawDegrees, double a_PitchDegrees)
 Vector3d cPlayer::GetThrowStartPos(void) const
 {
 	Vector3d res = GetEyePosition();
-	
+
 	// Adjust the position to be just outside the player's bounding box:
 	res.x += 0.16 * cos(GetPitch());
 	res.y += -0.1;
 	res.z += 0.16 * sin(GetPitch());
-	
+
 	return res;
 }
 
@@ -1323,9 +1350,9 @@ Vector3d cPlayer::GetThrowSpeed(double a_SpeedCoeff) const
 {
 	Vector3d res = GetLookVector();
 	res.Normalize();
-	
+
 	// TODO: Add a slight random change (+-0.0075 in each direction)
-	
+
 	return res * a_SpeedCoeff;
 }
 
@@ -1370,13 +1397,13 @@ void cPlayer::MoveTo( const Vector3d & a_NewPos)
 		}
 		return;
 	}
-	
+
 	// TODO: should do some checks to see if player is not moving through terrain
 	// TODO: Official server refuses position packets too far away from each other, kicking "hacked" clients; we should, too
 
 	Vector3d DeltaPos = a_NewPos - GetPosition();
 	UpdateMovementStats(DeltaPos);
-	
+
 	SetPosition( a_NewPos);
 	SetStance(a_NewPos.y + 1.62);
 }
@@ -1411,17 +1438,26 @@ bool cPlayer::HasPermission(const AString & a_Permission)
 		// Empty permission request is always granted
 		return true;
 	}
-	
+
 	AStringVector Split = StringSplit(a_Permission, ".");
 
+	// Iterate over all restrictions; if any matches, then return failure:
+	for (auto & Restriction: m_SplitRestrictions)
+	{
+		if (PermissionMatches(Split, Restriction))
+		{
+			return false;
+		}
+	}  // for Restriction - m_SplitRestrictions[]
+
 	// Iterate over all granted permissions; if any matches, then return success:
-	for (AStringVectorVector::const_iterator itr = m_SplitPermissions.begin(), end = m_SplitPermissions.end(); itr != end; ++itr)
+	for (auto & Permission: m_SplitPermissions)
 	{
-		if (PermissionMatches(Split, *itr))
+		if (PermissionMatches(Split, Permission))
 		{
 			return true;
 		}
-	}  // for itr - m_SplitPermissions[]
+	}  // for Permission - m_SplitPermissions[]
 
 	// No granted permission matches
 	return false;
@@ -1574,7 +1610,7 @@ void cPlayer::TossItems(const cItems & a_Items)
 	{
 		return;
 	}
-	
+
 	m_Stats.AddValue(statItemsDropped, (StatValue)a_Items.Size());
 
 	double vX = 0, vY = 0, vZ = 0;
@@ -1596,19 +1632,30 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 		// Don't move to same world
 		return false;
 	}
-	
+
+	//  Ask the plugins if the player is allowed to changing the world
+	if (cRoot::Get()->GetPluginManager()->CallHookEntityChangingWorld(*this, *a_World))
+	{
+		// A Plugin doesn't allow the player to changing the world
+		return false;
+	}
+
 	// Send the respawn packet:
 	if (a_ShouldSendRespawn && (m_ClientHandle != nullptr))
 	{
 		m_ClientHandle->SendRespawn(a_World->GetDimension());
 	}
 
+	// Broadcast for other people that the player is gone.
+	GetWorld()->BroadcastDestroyEntity(*this);
+
 	// Remove player from the old world
 	SetWorldTravellingFrom(GetWorld());  // cChunk handles entity removal
 	GetWorld()->RemovePlayer(this, false);
 
 	// Queue adding player to the new world, including all the necessary adjustments to the object
 	a_World->AddPlayer(this);
+	cWorld * OldWorld = cRoot::Get()->GetWorld(GetWorld()->GetName());  // Required for the hook HOOK_ENTITY_CHANGED_WORLD
 	SetWorld(a_World);  // Chunks may be streamed before cWorld::AddPlayer() sets the world to the new value
 
 	// Update the view distance.
@@ -1619,7 +1666,13 @@ bool cPlayer::DoMoveToWorld(cWorld * a_World, bool a_ShouldSendRespawn)
 	{
 		m_ClientHandle->SendWeather(a_World->GetWeather());
 	}
-	
+
+	// Broadcast the player into the new world.
+	a_World->BroadcastSpawnEntity(*this);
+
+	// Player changed the world, call the hook
+	cRoot::Get()->GetPluginManager()->CallHookEntityChangedWorld(*this, *OldWorld);
+
 	return true;
 }
 
@@ -1636,7 +1689,7 @@ bool cPlayer::LoadFromDisk(cWorldPtr & a_World)
 	{
 		return true;
 	}
-	
+
 	// Load from the offline UUID file, if allowed:
 	AString OfflineUUID = cClientHandle::GenerateOfflineUUID(GetName());
 	const char * OfflineUsage = " (unused)";
@@ -1648,7 +1701,7 @@ bool cPlayer::LoadFromDisk(cWorldPtr & a_World)
 			return true;
 		}
 	}
-	
+
 	// Load from the old-style name-based file, if allowed:
 	if (cRoot::Get()->GetServer()->ShouldLoadNamedPlayerData())
 	{
@@ -1663,7 +1716,7 @@ bool cPlayer::LoadFromDisk(cWorldPtr & a_World)
 			return true;
 		}
 	}
-	
+
 	// None of the files loaded successfully
 	LOG("Player data file not found for %s (%s, offline %s%s), will be reset to defaults.",
 		GetName().c_str(), m_UUID.c_str(), OfflineUUID.c_str(), OfflineUsage
@@ -1740,7 +1793,7 @@ bool cPlayer::LoadFromFile(const AString & a_FileName, cWorldPtr & a_World)
 	{
 		m_CanFly = true;
 	}
-	
+
 	m_Inventory.LoadFromJson(root["inventory"]);
 	cEnderChestEntity::LoadFromJson(root["enderchestinventory"], m_EnderChestContents);
 
@@ -1756,14 +1809,14 @@ bool cPlayer::LoadFromFile(const AString & a_FileName, cWorldPtr & a_World)
 	m_LastBedPos.z = root.get("SpawnZ", a_World->GetSpawnZ()).asInt();
 
 	// Load the player stats.
-	// We use the default world name (like bukkit) because stats are shared between dimensions/worlds.
+	// We use the default world name (like bukkit) because stats are shared between dimensions / worlds.
 	cStatSerializer StatSerializer(cRoot::Get()->GetDefaultWorld()->GetName(), GetName(), &m_Stats);
 	StatSerializer.Load();
-	
+
 	LOGD("Player %s was read from file \"%s\", spawning at {%.2f, %.2f, %.2f} in world \"%s\"",
 		GetName().c_str(), a_FileName.c_str(), GetPosX(), GetPosY(), GetPosZ(), a_World->GetName().c_str()
 	);
-	
+
 	return true;
 }
 
@@ -1853,7 +1906,7 @@ bool cPlayer::SaveToDisk()
 	}
 
 	// Save the player stats.
-	// We use the default world name (like bukkit) because stats are shared between dimensions/worlds.
+	// We use the default world name (like bukkit) because stats are shared between dimensions / worlds.
 	cStatSerializer StatSerializer(cRoot::Get()->GetDefaultWorld()->GetName(), GetName(), &m_Stats);
 	if (!StatSerializer.Save())
 	{
@@ -2061,7 +2114,7 @@ void cPlayer::UpdateMovementStats(const Vector3d & a_DeltaPos)
 		}
 		else
 		{
-			if (Value >= 25)  // Ignore small/slow movement
+			if (Value >= 25)  // Ignore small / slow movement
 			{
 				m_Stats.AddValue(statDistFlown, Value);
 			}
@@ -2119,7 +2172,7 @@ void cPlayer::ApplyFoodExhaustionFromMovement()
 	{
 		return;
 	}
-	
+
 	// Calculate the distance travelled, update the last pos:
 	Vector3d Movement(GetPosition() - m_LastPos);
 	Movement.y = 0;  // Only take XZ movement into account
@@ -2163,15 +2216,24 @@ void cPlayer::LoadRank(void)
 		RankMgr->UpdatePlayerName(m_UUID, m_PlayerName);
 	}
 	m_Permissions = RankMgr->GetPlayerPermissions(m_UUID);
+	m_Restrictions = RankMgr->GetPlayerRestrictions(m_UUID);
 	RankMgr->GetRankVisuals(m_Rank, m_MsgPrefix, m_MsgSuffix, m_MsgNameColorCode);
 
 	// Break up the individual permissions on each dot, into m_SplitPermissions:
 	m_SplitPermissions.clear();
 	m_SplitPermissions.reserve(m_Permissions.size());
-	for (AStringVector::const_iterator itr = m_Permissions.begin(), end = m_Permissions.end(); itr != end; ++itr)
+	for (auto & Permission: m_Permissions)
+	{
+		m_SplitPermissions.push_back(StringSplit(Permission, "."));
+	}  // for Permission - m_Permissions[]
+
+	// Break up the individual restrictions on each dot, into m_SplitRestrictions:
+	m_SplitRestrictions.clear();
+	m_SplitRestrictions.reserve(m_Restrictions.size());
+	for (auto & Restriction: m_Restrictions)
 	{
-		m_SplitPermissions.push_back(StringSplit(*itr, "."));
-	}  // for itr - m_Permissions[]
+		m_SplitRestrictions.push_back(StringSplit(Restriction, "."));
+	}  // for itr - m_Restrictions[]
 }
 
 
@@ -2313,7 +2375,7 @@ AString cPlayer::GetUUIDFileName(const AString & a_UUID)
 {
 	AString UUID = cMojangAPI::MakeUUIDDashed(a_UUID);
 	ASSERT(UUID.length() == 36);
-	
+
 	AString res("players/");
 	res.append(UUID, 0, 2);
 	res.push_back('/');
@@ -2321,7 +2383,3 @@ AString cPlayer::GetUUIDFileName(const AString & a_UUID)
 	res.append(".json");
 	return res;
 }
-
-
-
-
diff --git a/src/Entities/Player.h b/src/Entities/Player.h
index 3dae58dc1..a84fdd0c7 100644
--- a/src/Entities/Player.h
+++ b/src/Entities/Player.h
@@ -26,42 +26,42 @@ class cPlayer :
 	public cPawn
 {
 	typedef cPawn super;
-	
+
 public:
 	static const int MAX_HEALTH;
-	
+
 	static const int MAX_FOOD_LEVEL;
-	
+
 	/** Number of ticks it takes to eat an item */
 	static const int EATING_TICKS;
-	
+
 	// tolua_end
-	
+
 	CLASS_PROTODEF(cPlayer)
-	
+
 
 	cPlayer(cClientHandlePtr a_Client, const AString & a_PlayerName);
-	
+
 	virtual ~cPlayer();
 
 	virtual void SpawnOn(cClientHandle & a_Client) override;
-	
+
 	virtual void Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk) override;
 
 	virtual void HandlePhysics(std::chrono::milliseconds a_Dt, cChunk &) override { UNUSED(a_Dt); }
 
 	/** Returns the curently equipped weapon; empty item if none */
 	virtual cItem GetEquippedWeapon(void) const override { return m_Inventory.GetEquippedItem(); }
-	
+
 	/** Returns the currently equipped helmet; empty item if none */
 	virtual cItem GetEquippedHelmet(void) const override { return m_Inventory.GetEquippedHelmet(); }
-	
+
 	/** Returns the currently equipped chestplate; empty item if none */
 	virtual cItem GetEquippedChestplate(void) const override { return m_Inventory.GetEquippedChestplate(); }
 
 	/** Returns the currently equipped leggings; empty item if none */
 	virtual cItem GetEquippedLeggings(void) const override { return m_Inventory.GetEquippedLeggings(); }
-	
+
 	/** Returns the currently equipped boots; empty item if none */
 	virtual cItem GetEquippedBoots(void) const override { return m_Inventory.GetEquippedBoots(); }
 
@@ -104,16 +104,16 @@ public:
 	static int CalcLevelFromXp(int a_CurrentXp);
 
 	// tolua_end
-	
+
 	/** Starts charging the equipped bow */
 	void StartChargingBow(void);
-	
+
 	/** Finishes charging the current bow. Returns the number of ticks for which the bow has been charged */
 	int FinishChargingBow(void);
-	
+
 	/** Cancels the current bow charging */
 	void CancelChargingBow(void);
-	
+
 	/** Returns true if the player is currently charging the bow */
 	bool IsChargingBow(void) const { return m_IsChargingBow; }
 
@@ -122,13 +122,13 @@ public:
 	double GetEyeHeight(void) const;  // tolua_export
 	Vector3d GetEyePosition(void) const;  // tolua_export
 	virtual bool IsOnGround(void) const override { return m_bTouchGround; }
-	inline double GetStance(void) const { return GetPosY() + 1.62; }  // tolua_export  // TODO: Proper stance when crouching etc.
+	inline double GetStance(void) const { return m_Stance; }  // tolua_export
 	inline cInventory &       GetInventory(void)       { return m_Inventory; }  // tolua_export
 	inline const cInventory & GetInventory(void) const { return m_Inventory; }
 
 	/** Gets the contents of the player's associated enderchest */
 	cItemGrid & GetEnderChestContents(void) { return m_EnderChestContents; }
-	
+
 	inline const cItem & GetEquippedItem(void) const { return GetInventory().GetEquippedItem(); }  // tolua_export
 
 	/** Returns whether the player is climbing (ladders, vines etc.) */
@@ -137,43 +137,49 @@ public:
 	virtual void TeleportToCoords(double a_PosX, double a_PosY, double a_PosZ) override;
 
 	// tolua_begin
-	
+
 	/** Sends the "look" packet to the player, forcing them to set their rotation to the specified values.
 	a_YawDegrees is clipped to range [-180, +180),
 	a_PitchDegrees is clipped to range [-180, +180) but the client only uses [-90, +90]
 	*/
 	void SendRotation(double a_YawDegrees, double a_PitchDegrees);
-	
+
 	/** Returns the position where projectiles thrown by this player should start, player eye position + adjustment */
 	Vector3d GetThrowStartPos(void) const;
-	
+
 	/** Returns the initial speed vector of a throw, with a 3D length of a_SpeedCoeff. */
 	Vector3d GetThrowSpeed(double a_SpeedCoeff) const;
-	
+
 	/** Returns the current gamemode. Partly OBSOLETE, you should use IsGameModeXXX() functions wherever applicable */
 	eGameMode GetGameMode(void) const { return m_GameMode; }
-	
+
 	/** Returns the current effective gamemode (inherited gamemode is resolved before returning) */
 	eGameMode GetEffectiveGameMode(void) const { return (m_GameMode == gmNotSet) ? m_World->GetGameMode() : m_GameMode; }
-	
+
 	/** Sets the gamemode for the player.
 	The gamemode may be gmNotSet, in that case the player inherits the world's gamemode.
 	Updates the gamemode on the client (sends the packet)
 	*/
 	void SetGameMode(eGameMode a_GameMode);
 
+	// Sets the current gamemode, doesn't check validity, doesn't send update packets to client
+	void LoginSetGameMode(eGameMode a_GameMode);
+
+	// Updates player's capabilities - flying, visibility, etc. from their gamemode.
+	void SetCapabilities();
+
 	/** Returns true if the player is in Creative mode, either explicitly, or by inheriting from current world */
 	bool IsGameModeCreative(void) const;
-	
+
 	/** Returns true if the player is in Survival mode, either explicitly, or by inheriting from current world */
 	bool IsGameModeSurvival(void) const;
-	
+
 	/** Returns true if the player is in Adventure mode, either explicitly, or by inheriting from current world */
 	bool IsGameModeAdventure(void) const;
-	
+
 	/** Returns true if the player is in Spectator mode, either explicitly, or by inheriting from current world */
 	bool IsGameModeSpectator(void) const;
-	
+
 	AString GetIP(void) const { return m_IP; }  // tolua_export
 
 	/** Returns the associated team, nullptr if none */
@@ -195,11 +201,8 @@ public:
 	If the achievement has been already awarded to the player, this method will just increment the stat counter.
 	Returns the _new_ stat value. (0 = Could not award achievement) */
 	unsigned int AwardAchievement(const eStatistic a_Ach);
-	
+
 	void SetIP(const AString & a_IP);
-	
-	// Sets the current gamemode, doesn't check validity, doesn't send update packets to client
-	void LoginSetGameMode(eGameMode a_GameMode);
 
 	/** Forces the player to move in the given direction.
 	@deprecated Use SetSpeed instead. */
@@ -210,15 +213,15 @@ public:
 
 	cWindow * GetWindow(void) { return m_CurrentWindow; }  // tolua_export
 	const cWindow * GetWindow(void) const { return m_CurrentWindow; }
-	
+
 	/** Opens the specified window; closes the current one first using CloseWindow() */
 	void OpenWindow(cWindow * a_Window);  // Exported in ManualBindings.cpp
-	
+
 	// tolua_begin
-	
+
 	/** Closes the current window, resets current window to m_InventoryWindow. A plugin may refuse the closing if a_CanRefuse is true */
 	void CloseWindow(bool a_CanRefuse = true);
-	
+
 	/** Closes the current window if it matches the specified ID, resets current window to m_InventoryWindow */
 	void CloseWindowIfID(char a_WindowID, bool a_CanRefuse = true);
 
@@ -243,7 +246,7 @@ public:
 
 	const AString & GetName(void) const { return m_PlayerName; }
 	void SetName(const AString & a_Name) { m_PlayerName = a_Name; }
-	
+
 	// tolua_end
 
 	bool HasPermission(const AString & a_Permission);  // tolua_export
@@ -254,10 +257,13 @@ public:
 	static bool PermissionMatches(const AStringVector & a_Permission, const AStringVector & a_Template);  // Exported in ManualBindings with AString params
 
 	/** Returns all the permissions that the player has assigned to them. */
-	const AStringVector & GetPermissions(void) { return m_Permissions; }  // Exported in ManualBindings.cpp
+	const AStringVector & GetPermissions(void) const { return m_Permissions; }  // Exported in ManualBindings.cpp
+
+	/** Returns all the restrictions that the player has assigned to them. */
+	const AStringVector & GetRestrictions(void) const { return m_Restrictions; }  // Exported in ManualBindings.cpp
 
 	// tolua_begin
-	
+
 	/** Returns the full color code to use for this player, based on their rank.
 	The returned value either is empty, or includes the cChatColor::Delimiter. */
 	AString GetColor(void) const;
@@ -276,15 +282,15 @@ public:
 
 	/** Heals the player by the specified amount of HPs (positive only); sends health update */
 	virtual void Heal(int a_Health) override;
-	
+
 	int    GetFoodLevel                 (void) const { return m_FoodLevel; }
 	double GetFoodSaturationLevel       (void) const { return m_FoodSaturationLevel; }
 	int    GetFoodTickTimer             (void) const { return m_FoodTickTimer; }
 	double GetFoodExhaustionLevel       (void) const { return m_FoodExhaustionLevel; }
-	
+
 	/** Returns true if the player is satiated, i. e. their foodlevel is at the max and they cannot eat anymore */
 	bool IsSatiated(void) const { return (m_FoodLevel >= MAX_FOOD_LEVEL); }
-	
+
 	void SetFoodLevel                 (int a_FoodLevel);
 	void SetFoodSaturationLevel       (double a_FoodSaturationLevel);
 	void SetFoodTickTimer             (int a_FoodTickTimer);
@@ -295,10 +301,10 @@ public:
 
 	/** Adds the specified exhaustion to m_FoodExhaustion. Expects only positive values. */
 	void AddFoodExhaustion(double a_Exhaustion);
-	
+
 	/** Returns true if the player is currently in the process of eating the currently equipped item */
 	bool IsEating(void) const { return (m_EatingFinishTick >= 0); }
-	
+
 	/** Returns true if the player is currently flying. */
 	bool IsFlying(void) const { return m_IsFlying; }
 
@@ -326,16 +332,16 @@ public:
 			GetWorld()->BroadcastEntityAnimation(*this, 2);
 		}
 	}
-	
+
 	/** Starts eating the currently equipped item. Resets the eating timer and sends the proper animation packet */
 	void StartEating(void);
-	
+
 	/** Finishes eating the currently equipped item. Consumes the item, updates health and broadcasts the packets */
 	void FinishEating(void);
-	
+
 	/** Aborts the current eating operation */
 	void AbortEating(void);
-	
+
 	virtual void KilledBy(TakeDamageInfo & a_TDI) override;
 
 	virtual void Killed(cEntity * a_Victim) override;
@@ -353,69 +359,69 @@ public:
 	bool SaveToDisk(void);
 
 	typedef cWorld * cWorldPtr;
-	
+
 	/** Loads the player data from the disk file
 	Sets a_World to the world where the player will spawn, based on the stored world name or the default world by calling LoadFromFile()
 	Returns true on success, false on failure
 	*/
 	bool LoadFromDisk(cWorldPtr & a_World);
-	
+
 	/** Loads the player data from the specified file
 	Sets a_World to the world where the player will spawn, based on the stored world name or the default world
 	Returns true on success, false on failure
 	*/
 	bool LoadFromFile(const AString & a_FileName, cWorldPtr & a_World);
-	
+
 	const AString & GetLoadedWorldName() { return m_LoadedWorldName; }
 
 	void UseEquippedItem(int a_Amount = 1);
-	
+
 	void SendHealth(void);
 
 	void SendExperience(void);
-	
+
 	/** In UI windows, get the item that the player is dragging */
 	cItem & GetDraggingItem(void) {return m_DraggingItem; }
-	
+
 	// In UI windows, when inventory-painting:
 	/** Clears the list of slots that are being inventory-painted. To be used by cWindow only */
 	void ClearInventoryPaintSlots(void);
-	
+
 	/** Adds a slot to the list for inventory painting. To be used by cWindow only */
 	void AddInventoryPaintSlot(int a_SlotNum);
-	
+
 	/** Returns the list of slots currently stored for inventory painting. To be used by cWindow only */
 	const cSlotNums & GetInventoryPaintSlots(void) const;
-	
+
 	// tolua_begin
-	
+
 	/** Returns the current relative maximum speed (takes current sprinting / flying state into account) */
 	double GetMaxSpeed(void) const;
-	
+
 	/** Gets the normal relative maximum speed */
 	double GetNormalMaxSpeed(void) const { return m_NormalMaxSpeed; }
-	
+
 	/** Gets the sprinting relative maximum speed */
 	double GetSprintingMaxSpeed(void) const { return m_SprintingMaxSpeed; }
-	
+
 	/** Gets the flying relative maximum speed */
 	double GetFlyingMaxSpeed(void) const { return m_FlyingMaxSpeed; }
-	
+
 	/** Sets the normal relative maximum speed. Sends the update to player, if needed. */
 	void SetNormalMaxSpeed(double a_Speed);
-	
+
 	/** Sets the sprinting relative maximum speed. Sends the update to player, if needed. */
 	void SetSprintingMaxSpeed(double a_Speed);
-	
+
 	/** Sets the flying relative maximum speed. Sends the update to player, if needed. */
 	void SetFlyingMaxSpeed(double a_Speed);
-	
+
 	/** Sets the crouch status, broadcasts to all visible players */
 	void SetCrouch(bool a_IsCrouched);
-	
+
 	/** Starts or stops sprinting, sends the max speed update to the client, if needed */
 	void SetSprint(bool a_IsSprinting);
-	
+
 	/** Flags the player as flying */
 	void SetFlying(bool a_IsFlying);
 
@@ -439,17 +445,17 @@ public:
 
 	/** Sets the player's bed (home) position */
 	void SetBedPos(const Vector3i & a_Pos) { m_LastBedPos = a_Pos; }
-	
+
 	// tolua_end
 
 	/** Update movement-related statistics. */
 	void UpdateMovementStats(const Vector3d & a_DeltaPos);
-	
+
 	// tolua_begin
 
 	/** Returns wheter the player can fly or not. */
 	virtual bool CanFly(void) const { return m_CanFly; }
-	
+
 	/** Returns the UUID (short format) that has been read from the client, or empty string if not available. */
 	const AString & GetUUID(void) const { return m_UUID; }
 
@@ -480,16 +486,16 @@ public:
 	bool PlaceBlocks(const sSetBlockVector & a_Blocks);
 
 	// cEntity overrides:
-	virtual bool IsCrouched (void) const { return m_IsCrouched; }
-	virtual bool IsSprinting(void) const { return m_IsSprinting; }
-	virtual bool IsRclking  (void) const { return IsEating() || IsChargingBow(); }
+	virtual bool IsCrouched (void) const override { return m_IsCrouched; }
+	virtual bool IsSprinting(void) const override { return m_IsSprinting; }
+	virtual bool IsRclking  (void) const override { return IsEating() || IsChargingBow(); }
 
-	virtual void Detach(void);
+	virtual void Detach(void) override;
 
 	/** Called by cClientHandle when the client is being destroyed.
 	The player removes its m_ClientHandle ownership so that the ClientHandle gets deleted. */
 	void RemoveClientHandle(void);
-	
+
 protected:
 
 	typedef std::vector<std::vector<AString> > AStringVectorVector;
@@ -500,10 +506,18 @@ protected:
 	/** All the permissions that this player has, based on their rank. */
 	AStringVector m_Permissions;
 
+	/** All the restrictions that this player has, based on their rank. */
+	AStringVector m_Restrictions;
+
 	/** All the permissions that this player has, based on their rank, split into individual dot-delimited parts.
 	This is used mainly by the HasPermission() function to optimize the lookup. */
 	AStringVectorVector m_SplitPermissions;
 
+	/** All the restrictions that this player has, based on their rank, split into individual dot-delimited parts.
+	This is used mainly by the HasPermission() function to optimize the lookup. */
+	AStringVectorVector m_SplitRestrictions;
+
+
 	// Message visuals:
 	AString m_MsgPrefix, m_MsgSuffix;
 	AString m_MsgNameColorCode;
@@ -524,16 +538,16 @@ protected:
 	// Food-related variables:
 	/** Represents the food bar, one point equals half a "drumstick" */
 	int m_FoodLevel;
-	
+
 	/** "Overcharge" for the m_FoodLevel; is depleted before m_FoodLevel */
 	double m_FoodSaturationLevel;
-	
+
 	/** Count-up to the healing or damaging action, based on m_FoodLevel */
 	int m_FoodTickTimer;
-	
+
 	/** A "buffer" which adds up hunger before it is substracted from m_FoodSaturationLevel or m_FoodLevel. Each action adds a little */
 	double m_FoodExhaustionLevel;
-	
+
 	float m_LastJumpHeight;
 	float m_LastGroundHeight;
 	bool m_bTouchGround;
@@ -553,31 +567,31 @@ protected:
 
 	eGameMode m_GameMode;
 	AString m_IP;
-	
+
 	/** The item being dragged by the cursor while in a UI window */
 	cItem m_DraggingItem;
 
 	std::chrono::steady_clock::time_point m_LastPlayerListTime;
 
 	cClientHandlePtr m_ClientHandle;
-	
+
 	cSlotNums m_InventoryPaintSlots;
-	
+
 	/** Max speed, relative to the game default.
 	1 means regular speed, 2 means twice as fast, 0.5 means half-speed.
 	Default value is 1. */
 	double m_NormalMaxSpeed;
-	
+
 	/** Max speed, relative to the game default max speed, when sprinting.
 	1 means regular speed, 2 means twice as fast, 0.5 means half-speed.
 	Default value is 1.3. */
 	double m_SprintingMaxSpeed;
-	
+
 	/** Max speed, relative to the game default flying max speed, when flying.
 	1 means regular speed, 2 means twice as fast, 0.5 means half-speed.
 	Default value is 1. */
 	double m_FlyingMaxSpeed;
-	
+
 	bool m_IsCrouched;
 	bool m_IsSprinting;
 	bool m_IsFlying;
@@ -618,7 +632,7 @@ protected:
 	Will not apply food penalties if found to be true; will set to false after processing
 	*/
 	bool m_bIsTeleporting;
-	
+
 	/** The short UUID (no dashes) of the player, as read from the ClientHandle.
 	If no ClientHandle is given, the UUID is initialized to empty. */
 	AString m_UUID;
@@ -631,14 +645,14 @@ protected:
 	void ResolvePermissions(void);
 	void ResolveGroups(void);
 
-	virtual void Destroyed(void);
+	virtual void Destroyed(void) override;
 
-	/** Filters out damage for creative mode/friendly fire */
+	/** Filters out damage for creative mode / friendly fire */
 	virtual bool DoTakeDamage(TakeDamageInfo & TDI) override;
 
 	/** Stops players from burning in creative mode */
 	virtual void TickBurning(cChunk & a_Chunk) override;
-	
+
 	/** Called in each tick to handle food-related processing */
 	void HandleFood(void);
 
@@ -655,7 +669,3 @@ protected:
 	This can be used both for online and offline UUIDs. */
 	AString GetUUIDFileName(const AString & a_UUID);
 } ;  // tolua_export
-
-
-
-
diff --git a/src/Entities/ProjectileEntity.cpp b/src/Entities/ProjectileEntity.cpp
index 4684e3e09..05b7669cd 100644
--- a/src/Entities/ProjectileEntity.cpp
+++ b/src/Entities/ProjectileEntity.cpp
@@ -227,6 +227,8 @@ cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a
 	),
 	m_IsInGround(false)
 {
+	SetGravity(-12.0f);
+	SetAirDrag(0.01f);
 }
 
 
@@ -242,6 +244,8 @@ cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, const Ve
 	SetSpeed(a_Speed);
 	SetYawFromSpeed();
 	SetPitchFromSpeed();
+	SetGravity(-12.0f);
+	SetAirDrag(0.01f);
 }
 
 
@@ -349,9 +353,11 @@ void cProjectileEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a
 		return;
 	}
 	
-	const Vector3d PerTickSpeed = GetSpeed() / 20;
+	auto DtSec = std::chrono::duration_cast<std::chrono::duration<double>>(a_Dt);
+
+	const Vector3d DeltaSpeed = GetSpeed() * DtSec.count();
 	const Vector3d Pos = GetPosition();
-	const Vector3d NextPos = Pos + PerTickSpeed;
+	const Vector3d NextPos = Pos + DeltaSpeed;
 
 	// Test for entity collisions:
 	cProjectileEntityCollisionCallback EntityCollisionCallback(this, Pos, NextPos);
@@ -388,8 +394,8 @@ void cProjectileEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a
 	
 	// Add slowdown and gravity effect to the speed:
 	Vector3d NewSpeed(GetSpeed());
-	NewSpeed.y += m_Gravity / 20;
-	NewSpeed *= TracerCallback.GetSlowdownCoeff();
+	NewSpeed.y += m_Gravity * DtSec.count();
+	NewSpeed -= NewSpeed * (m_AirDrag * 20.0f) * DtSec.count();
 	SetSpeed(NewSpeed);
 	SetYawFromSpeed();
 	SetPitchFromSpeed();
diff --git a/src/Entities/ProjectileEntity.h b/src/Entities/ProjectileEntity.h
index de460a8ad..7ee87f93a 100644
--- a/src/Entities/ProjectileEntity.h
+++ b/src/Entities/ProjectileEntity.h
@@ -109,7 +109,7 @@ protected:
 	eKind m_ProjectileKind;
 	
 	/** The structure for containing the entity ID and name who has created this projectile
-	The ID and/or name may be nullptr (e.g. for dispensers/mobs). */
+	The ID and / or name may be nullptr (e.g. for dispensers / mobs). */
 	CreatorData m_CreatorData;
 	
 	/** True if the projectile has hit the ground and is stuck there */
diff --git a/src/Entities/TNTEntity.cpp b/src/Entities/TNTEntity.cpp
index a89d2f300..d849bd4c9 100644
--- a/src/Entities/TNTEntity.cpp
+++ b/src/Entities/TNTEntity.cpp
@@ -12,6 +12,8 @@ cTNTEntity::cTNTEntity(double a_X, double a_Y, double a_Z, int a_FuseTicks) :
 	super(etTNT, a_X, a_Y, a_Z, 0.98, 0.98),
 	m_FuseTicks(a_FuseTicks)
 {
+	SetGravity(-16.0f);
+	SetAirDrag(0.02f);
 }
 
 
@@ -22,6 +24,8 @@ cTNTEntity::cTNTEntity(const Vector3d & a_Pos, int a_FuseTicks) :
 	super(etTNT, a_Pos.x, a_Pos.y, a_Pos.z, 0.98, 0.98),
 	m_FuseTicks(a_FuseTicks)
 {
+	SetGravity(-16.0f);
+	SetAirDrag(0.4f);
 }
 
 
diff --git a/src/Entities/WitherSkullEntity.cpp b/src/Entities/WitherSkullEntity.cpp
index a7e774bba..dc95e3edd 100644
--- a/src/Entities/WitherSkullEntity.cpp
+++ b/src/Entities/WitherSkullEntity.cpp
@@ -16,6 +16,8 @@ cWitherSkullEntity::cWitherSkullEntity(cEntity * a_Creator, double a_X, double a
 	super(pkWitherSkull, a_Creator, a_X, a_Y, a_Z, 0.25, 0.25)
 {
 	SetSpeed(a_Speed);
+	SetGravity(0);
+	SetAirDrag(0);
 }