19 files changed, 3515 insertions, 0 deletions

diff --git a/src/Simulator/DelayedFluidSimulator.cpp b/src/Simulator/DelayedFluidSimulator.cpp
new file mode 100644
index 000000000..a4645ca09
--- /dev/null
+++ b/src/Simulator/DelayedFluidSimulator.cpp
@@ -0,0 +1,158 @@
+
+// DelayedFluidSimulator.cpp
+
+// Interfaces to the cDelayedFluidSimulator class representing a fluid simulator that has a configurable delay
+// before simulating a block. Each tick it takes a consecutive delay "slot" and simulates only blocks in that slot.
+
+#include "Globals.h"
+
+#include "DelayedFluidSimulator.h"
+#include "../World.h"
+#include "../Chunk.h"
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cDelayedFluidSimulatorChunkData::cSlot
+
+bool cDelayedFluidSimulatorChunkData::cSlot::Add(int a_RelX, int a_RelY, int a_RelZ)
+{
+	ASSERT(a_RelZ >= 0);
+	ASSERT(a_RelZ < ARRAYCOUNT(m_Blocks));
+	
+	cCoordWithIntVector & Blocks = m_Blocks[a_RelZ];
+	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY, a_RelZ);
+	for (cCoordWithIntVector::const_iterator itr = Blocks.begin(), end = Blocks.end(); itr != end; ++itr)
+	{
+		if (itr->Data == Index)
+		{
+			// Already present
+			return false;
+		}
+	}  // for itr - Blocks[]
+	Blocks.push_back(cCoordWithInt(a_RelX, a_RelY, a_RelZ, Index));
+	return true;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cDelayedFluidSimulatorChunkData:
+
+cDelayedFluidSimulatorChunkData::cDelayedFluidSimulatorChunkData(int a_TickDelay) :
+	m_Slots(new cSlot[a_TickDelay])
+{
+}
+
+
+
+
+
+cDelayedFluidSimulatorChunkData::~cDelayedFluidSimulatorChunkData()
+{
+	delete[] m_Slots;
+	m_Slots = NULL;
+}
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cDelayedFluidSimulator:
+
+cDelayedFluidSimulator::cDelayedFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, int a_TickDelay) :
+	super(a_World, a_Fluid, a_StationaryFluid),
+	m_TickDelay(a_TickDelay),
+	m_AddSlotNum(a_TickDelay - 1),
+	m_SimSlotNum(0),
+	m_TotalBlocks(0)
+{
+}
+
+
+
+
+
+void cDelayedFluidSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if ((a_BlockY < 0) || (a_BlockY >= cChunkDef::Height))
+	{
+		// Not inside the world (may happen when rclk with a full bucket - the client sends Y = -1)
+		return;
+	}
+	
+	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
+	{
+		return;
+	}
+	
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
+	BLOCKTYPE BlockType = a_Chunk->GetBlock(RelX, a_BlockY, RelZ);
+	if (BlockType != m_FluidBlock)
+	{
+		return;
+	}
+
+	void * ChunkDataRaw = (m_FluidBlock == E_BLOCK_WATER) ? a_Chunk->GetWaterSimulatorData() : a_Chunk->GetLavaSimulatorData();
+	cDelayedFluidSimulatorChunkData * ChunkData = (cDelayedFluidSimulatorChunkData *)ChunkDataRaw;
+	cDelayedFluidSimulatorChunkData::cSlot & Slot = ChunkData->m_Slots[m_AddSlotNum];
+	
+	// Add, if not already present:
+	if (!Slot.Add(RelX, a_BlockY, RelZ))
+	{
+		return;
+	}
+
+	++m_TotalBlocks;
+}
+
+
+
+
+
+void cDelayedFluidSimulator::Simulate(float a_Dt)
+{
+	m_AddSlotNum = m_SimSlotNum;
+	m_SimSlotNum += 1;
+	if (m_SimSlotNum >= m_TickDelay)
+	{
+		m_SimSlotNum = 0;
+	}
+}
+
+
+
+
+
+void cDelayedFluidSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{	
+	void * ChunkDataRaw = (m_FluidBlock == E_BLOCK_WATER) ? a_Chunk->GetWaterSimulatorData() : a_Chunk->GetLavaSimulatorData();
+	cDelayedFluidSimulatorChunkData * ChunkData = (cDelayedFluidSimulatorChunkData *)ChunkDataRaw;
+	cDelayedFluidSimulatorChunkData::cSlot & Slot = ChunkData->m_Slots[m_SimSlotNum];
+	
+	// Simulate all the blocks in the scheduled slot:
+	for (int i = 0; i < ARRAYCOUNT(Slot.m_Blocks); i++)
+	{
+		cCoordWithIntVector & Blocks = Slot.m_Blocks[i];
+		if (Blocks.empty())
+		{
+			continue;
+		}
+		for (cCoordWithIntVector::iterator itr = Blocks.begin(), end = Blocks.end(); itr != end; ++itr)
+		{
+			SimulateBlock(a_Chunk, itr->x, itr->y, itr->z);
+		}
+		m_TotalBlocks -= Blocks.size();
+		Blocks.clear();
+	}
+}
+
+
+
+
diff --git a/src/Simulator/DelayedFluidSimulator.h b/src/Simulator/DelayedFluidSimulator.h
new file mode 100644
index 000000000..c81500741
--- /dev/null
+++ b/src/Simulator/DelayedFluidSimulator.h
@@ -0,0 +1,82 @@
+
+// DelayedFluidSimulator.h
+
+// Interfaces to the cDelayedFluidSimulator class representing a fluid simulator that has a configurable delay
+// before simulating a block. Each tick it takes a consecutive delay "slot" and simulates only blocks in that slot.
+
+
+
+
+#pragma once
+
+#include "FluidSimulator.h"
+
+
+
+
+
+class cDelayedFluidSimulatorChunkData :
+	public cFluidSimulatorData
+{
+public:
+	class cSlot
+	{
+	public:
+		/// Returns true if the specified block is stored
+		bool HasBlock(int a_RelX, int a_RelY, int a_RelZ);
+		
+		/// Adds the specified block unless already present; returns true if added, false if the block was already present
+		bool Add(int a_RelX, int a_RelY, int a_RelZ);
+		
+		/** Array of block containers, each item stores blocks for one Z coord
+		Int param is the block index (for faster duplicate comparison in Add())
+		*/
+		cCoordWithIntVector m_Blocks[16];
+	} ;
+	
+	cDelayedFluidSimulatorChunkData(int a_TickDelay);
+	virtual ~cDelayedFluidSimulatorChunkData();
+	
+	/// Slots, one for each delay tick, each containing the blocks to simulate
+	cSlot * m_Slots;
+} ;
+
+
+
+
+
+class cDelayedFluidSimulator :
+	public cFluidSimulator
+{
+	typedef cFluidSimulator super;
+
+public:	
+	cDelayedFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, int a_TickDelay);
+	
+	// cSimulator overrides:
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
+	virtual void Simulate(float a_Dt) override;
+	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
+	virtual cFluidSimulatorData * CreateChunkData(void) override { return new cDelayedFluidSimulatorChunkData(m_TickDelay); }
+	
+protected:
+
+	int m_TickDelay;   // Count of the m_Slots array in each ChunkData
+	int m_AddSlotNum;  // Index into m_Slots[] where to add new blocks in each ChunkData
+	int m_SimSlotNum;  // Index into m_Slots[] where to simulate blocks in each ChunkData
+	
+	int m_TotalBlocks;  // Statistics only: the total number of blocks currently queued
+
+	/*
+	Slots:
+	| 0 | 1 | ... | m_AddSlotNum | m_SimSlotNum | ... | m_TickDelay - 1 |
+	        adding blocks here ^ | ^ simulating here
+	*/
+	
+	/// Called from SimulateChunk() to simulate each block in one slot of blocks. Descendants override this method to provide custom simulation.
+	virtual void SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ) = 0;
+} ;
+
+
+
+
diff --git a/src/Simulator/FireSimulator.cpp b/src/Simulator/FireSimulator.cpp
new file mode 100644
index 000000000..ac3fb9695
--- /dev/null
+++ b/src/Simulator/FireSimulator.cpp
@@ -0,0 +1,374 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "FireSimulator.h"
+#include "../World.h"
+#include "../BlockID.h"
+#include "../Defines.h"
+#include "../Chunk.h"
+
+
+
+
+
+// Easy switch for turning on debugging logging:
+#if 0
+	#define FLOG LOGD
+#else
+	#define FLOG(...)
+#endif
+
+
+
+
+
+#define MAX_CHANCE_REPLACE_FUEL 100000
+#define MAX_CHANCE_FLAMMABILITY 100000
+
+
+
+
+
+static const struct
+{
+	int x, y, z;
+} gCrossCoords[] =
+{
+	{ 1, 0,  0},
+	{-1, 0,  0},
+	{ 0, 0,  1},
+	{ 0, 0, -1},
+} ;
+
+
+
+
+
+static const struct
+{
+	int x, y, z;
+} gNeighborCoords[] =
+{
+	{ 1,  0,  0},
+	{-1,  0,  0},
+	{ 0,  1,  0},
+	{ 0, -1,  0},
+	{ 0,  0,  1},
+	{ 0,  0, -1},
+} ;
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cFireSimulator:
+
+cFireSimulator::cFireSimulator(cWorld & a_World, cIniFile & a_IniFile) :
+	cSimulator(a_World)
+{
+	// Read params from the ini file:
+	m_BurnStepTimeFuel    = a_IniFile.GetValueSetI("FireSimulator", "BurnStepTimeFuel",     500);
+	m_BurnStepTimeNonfuel = a_IniFile.GetValueSetI("FireSimulator", "BurnStepTimeNonfuel",  100);
+	m_Flammability        = a_IniFile.GetValueSetI("FireSimulator", "Flammability",          50);
+	m_ReplaceFuelChance   = a_IniFile.GetValueSetI("FireSimulator", "ReplaceFuelChance",  50000);
+}
+
+
+
+
+
+cFireSimulator::~cFireSimulator()
+{
+}
+
+
+
+
+
+void cFireSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{
+	cCoordWithIntList & Data = a_Chunk->GetFireSimulatorData();
+
+	int NumMSecs = (int)a_Dt;
+	for (cCoordWithIntList::iterator itr = Data.begin(); itr != Data.end();)
+	{
+		int idx = cChunkDef::MakeIndexNoCheck(itr->x, itr->y, itr->z);
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(idx);
+
+		if (!IsAllowedBlock(BlockType))
+		{
+			// The block is no longer eligible (not a fire block anymore; a player probably placed a block over the fire)
+			FLOG("FS: Removing block {%d, %d, %d}",
+				itr->x + a_ChunkX * cChunkDef::Width, itr->y, itr->z + a_ChunkZ * cChunkDef::Width
+			);
+			itr = Data.erase(itr);
+			continue;
+		}
+
+		// Try to spread the fire:
+		TrySpreadFire(a_Chunk, itr->x, itr->y, itr->z);
+
+		itr->Data -= NumMSecs;
+		if (itr->Data >= 0)
+		{
+			// Not yet, wait for it longer
+			++itr;
+			continue;
+		}
+		
+		// Burn out the fire one step by increasing the meta:
+		/*
+		FLOG("FS: Fire at {%d, %d, %d} is stepping",
+			itr->x + a_ChunkX * cChunkDef::Width, itr->y, itr->z + a_ChunkZ * cChunkDef::Width
+		);
+		*/
+		NIBBLETYPE BlockMeta = a_Chunk->GetMeta(idx);
+		if (BlockMeta == 0x0f)
+		{
+			// The fire burnt out completely
+			FLOG("FS: Fire at {%d, %d, %d} burnt out, removing the fire block",
+				itr->x + a_ChunkX * cChunkDef::Width, itr->y, itr->z + a_ChunkZ * cChunkDef::Width
+			);
+			a_Chunk->SetBlock(itr->x, itr->y, itr->z, E_BLOCK_AIR, 0);
+			RemoveFuelNeighbors(a_Chunk, itr->x, itr->y, itr->z);
+			itr = Data.erase(itr);
+			continue;
+		}
+		a_Chunk->SetMeta(idx, BlockMeta + 1);
+		itr->Data = GetBurnStepTime(a_Chunk, itr->x, itr->y, itr->z);  // TODO: Add some randomness into this
+	}  // for itr - Data[]
+}
+
+
+
+
+
+bool cFireSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
+{
+	return (a_BlockType == E_BLOCK_FIRE);
+}
+
+
+
+
+
+bool cFireSimulator::IsFuel(BLOCKTYPE a_BlockType)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_PLANKS:
+		case E_BLOCK_LEAVES:
+		case E_BLOCK_LOG:
+		case E_BLOCK_WOOL:
+		case E_BLOCK_BOOKCASE:
+		case E_BLOCK_FENCE:
+		case E_BLOCK_TNT:
+		case E_BLOCK_VINES:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cFireSimulator::IsForever(BLOCKTYPE a_BlockType)
+{
+	return (a_BlockType == E_BLOCK_NETHERRACK);
+}
+
+
+
+
+
+void cFireSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
+	{
+		return;
+	}
+	
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
+	BLOCKTYPE BlockType = a_Chunk->GetBlock(RelX, a_BlockY, RelZ);
+	if (!IsAllowedBlock(BlockType))
+	{
+		return;
+	}
+	
+	// Check for duplicates:
+	cFireSimulatorChunkData & ChunkData = a_Chunk->GetFireSimulatorData();
+	for (cCoordWithIntList::iterator itr = ChunkData.begin(), end = ChunkData.end(); itr != end; ++itr)
+	{
+		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ))
+		{
+			// Already present, skip adding
+			return;
+		}
+	}  // for itr - ChunkData[]
+
+	FLOG("FS: Adding block {%d, %d, %d}", a_BlockX, a_BlockY, a_BlockZ);
+	ChunkData.push_back(cCoordWithInt(RelX, a_BlockY, RelZ, 100));
+}
+
+
+
+
+
+int cFireSimulator::GetBurnStepTime(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	bool IsBlockBelowSolid = false;
+	if (a_RelY > 0)
+	{
+		BLOCKTYPE BlockBelow = a_Chunk->GetBlock(a_RelX, a_RelY - 1, a_RelZ);
+		if (IsForever(BlockBelow))
+		{
+			// Is burning atop of netherrack, burn forever (re-check in 10 sec)
+			return 10000;
+		}
+		if (IsFuel(BlockBelow))
+		{
+			return m_BurnStepTimeFuel;
+		}
+		IsBlockBelowSolid = g_BlockIsSolid[BlockBelow];
+	}
+	
+	for (int i = 0; i < ARRAYCOUNT(gCrossCoords); i++)
+	{
+		BLOCKTYPE  BlockType;
+		NIBBLETYPE BlockMeta;
+		if (a_Chunk->UnboundedRelGetBlock(a_RelX + gCrossCoords[i].x, a_RelY, a_RelZ + gCrossCoords[i].z, BlockType, BlockMeta))
+		{
+			if (IsFuel(BlockType))
+			{
+				return m_BurnStepTimeFuel;
+			}
+		}
+	}  // for i - gCrossCoords[]
+
+	if (!IsBlockBelowSolid && (a_RelY >= 0))
+	{
+		// Checked through everything, nothing was flammable
+		// If block below isn't solid, we can't have fire, it would be a non-fueled fire
+		// SetBlock just to make sure fire doesn't spawn
+		a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_AIR, 0);
+		return 0;
+	}
+	return m_BurnStepTimeNonfuel;
+}
+
+
+
+
+
+void cFireSimulator::TrySpreadFire(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	/*
+	if (m_World.GetTickRandomNumber(10000) > 100)
+	{
+		// Make the chance to spread 100x smaller
+		return;
+	}
+	*/
+	
+	for (int x = a_RelX - 1; x <= a_RelX + 1; x++)
+	{
+		for (int z = a_RelZ - 1; z <= a_RelZ + 1; z++)
+		{
+			for (int y = a_RelY - 1; y <= a_RelY + 2; y++)  // flames spread up one more block than around
+			{
+				// No need to check the coords for equality with the parent block,
+				// it cannot catch fire anyway (because it's not an air block)
+				
+				if (m_World.GetTickRandomNumber(MAX_CHANCE_FLAMMABILITY) > m_Flammability) 
+				{
+					continue;
+				}
+				
+				// Start the fire in the neighbor {x, y, z}
+				/*
+				FLOG("FS: Trying to start fire at {%d, %d, %d}.", 
+					x + a_Chunk->GetPosX() * cChunkDef::Width, y, z + a_Chunk->GetPosZ() * cChunkDef::Width
+				);
+				*/
+				if (CanStartFireInBlock(a_Chunk, x, y, z))
+				{
+					FLOG("FS: Starting new fire at {%d, %d, %d}.", 
+						x + a_Chunk->GetPosX() * cChunkDef::Width, y, z + a_Chunk->GetPosZ() * cChunkDef::Width
+					);
+					a_Chunk->UnboundedRelSetBlock(x, y, z, E_BLOCK_FIRE, 0);
+				}
+			}  // for y
+		}  // for z
+	}  // for x
+}
+
+
+
+
+
+void cFireSimulator::RemoveFuelNeighbors(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	for (int i = 0; i < ARRAYCOUNT(gNeighborCoords); i++)
+	{
+		BLOCKTYPE  BlockType;
+		NIBBLETYPE BlockMeta;
+		if (!a_Chunk->UnboundedRelGetBlock(a_RelX + gNeighborCoords[i].x, a_RelY + gNeighborCoords[i].y, a_RelZ + gNeighborCoords[i].z, BlockType, BlockMeta))
+		{
+			// Neighbor not accessible, ignore it
+			continue;
+		}
+		if (!IsFuel(BlockType))
+		{
+			continue;
+		}
+		bool ShouldReplaceFuel = (m_World.GetTickRandomNumber(MAX_CHANCE_REPLACE_FUEL) < m_ReplaceFuelChance);
+		a_Chunk->UnboundedRelSetBlock(
+			a_RelX + gNeighborCoords[i].x, a_RelY + gNeighborCoords[i].y, a_RelZ + gNeighborCoords[i].z,
+			ShouldReplaceFuel ? E_BLOCK_FIRE : E_BLOCK_AIR, 0
+		);
+	}  // for i - Coords[]
+}
+
+
+
+
+
+bool cFireSimulator::CanStartFireInBlock(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	BLOCKTYPE  BlockType;
+	NIBBLETYPE BlockMeta;
+	if (!a_NearChunk->UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockType, BlockMeta))
+	{
+		// The chunk is not accessible
+		return false;
+	}
+	
+	if (BlockType != E_BLOCK_AIR)
+	{
+		// Only an air block can be replaced by a fire block
+		return false;
+	}
+	
+	for (int i = 0; i < ARRAYCOUNT(gNeighborCoords); i++)
+	{
+		if (!a_NearChunk->UnboundedRelGetBlock(a_RelX + gNeighborCoords[i].x, a_RelY + gNeighborCoords[i].y, a_RelZ + gNeighborCoords[i].z, BlockType, BlockMeta))
+		{
+			// Neighbor inaccessible, skip it while evaluating
+			continue;
+		}
+		if (IsFuel(BlockType))
+		{
+			return true;
+		}
+	}  // for i - Coords[]
+	return false;
+}
+
+
+
+
diff --git a/src/Simulator/FireSimulator.h b/src/Simulator/FireSimulator.h
new file mode 100644
index 000000000..0d8a548ef
--- /dev/null
+++ b/src/Simulator/FireSimulator.h
@@ -0,0 +1,75 @@
+
+#pragma once
+
+#include "Simulator.h"
+#include "../BlockEntities/BlockEntity.h"
+
+
+
+
+
+/** The fire simulator takes care of the fire blocks.
+It periodically increases their meta ("steps") until they "burn out"; it also supports the forever burning netherrack.
+Each individual fire block gets stored in per-chunk data; that list is then used for fast retrieval.
+The data value associated with each coord is used as the number of msec that the fire takes until
+it progresses to the next step (blockmeta++). This value is updated if a neighbor is changed.
+The simulator reads its parameters from the ini file given to the constructor.
+*/
+class cFireSimulator :
+	public cSimulator
+{
+public:
+	cFireSimulator(cWorld & a_World, cIniFile & a_IniFile);
+	~cFireSimulator();
+
+	virtual void Simulate(float a_Dt) override {}  // not used
+	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
+
+	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) override;
+
+	bool IsFuel   (BLOCKTYPE a_BlockType);
+	bool IsForever(BLOCKTYPE a_BlockType);
+
+protected:
+	/// Time (in msec) that a fire block takes to burn with a fuel block into the next step
+	unsigned m_BurnStepTimeFuel;
+
+	/// Time (in msec) that a fire block takes to burn without a fuel block into the next step
+	unsigned m_BurnStepTimeNonfuel;
+
+	/// Chance [0..100000] of an adjacent fuel to catch fire on each tick
+	int m_Flammability;
+	
+	/// Chance [0..100000] of a fuel burning out being replaced by a new fire block instead of an air block
+	int m_ReplaceFuelChance;
+	
+	
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
+	
+	/// Returns the time [msec] after which the specified fire block is stepped again; based on surrounding fuels
+	int GetBurnStepTime(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+	
+	/// Tries to spread fire to a neighborhood of the specified block
+	void TrySpreadFire(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+	
+	/// Removes all burnable blocks neighboring the specified block
+	void RemoveFuelNeighbors(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+	
+	/** Returns true if a fire can be started in the specified block,
+	that is, it is an air block and has fuel next to it.
+	Note that a_NearChunk may be a chunk neighbor to the block specified!
+	The coords are relative to a_NearChunk but not necessarily in it.
+	*/
+	bool CanStartFireInBlock(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ);
+} ;
+
+
+
+
+
+/// Stores individual fire blocks in the chunk; the int data is used as the time [msec] the fire takes to step to another stage (blockmeta++)
+typedef cCoordWithIntList cFireSimulatorChunkData;
+
+
+
+
diff --git a/src/Simulator/FloodyFluidSimulator.cpp b/src/Simulator/FloodyFluidSimulator.cpp
new file mode 100644
index 000000000..d204a1f8b
--- /dev/null
+++ b/src/Simulator/FloodyFluidSimulator.cpp
@@ -0,0 +1,330 @@
+
+// FloodyFluidSimulator.cpp
+
+// Interfaces to the cFloodyFluidSimulator that represents a fluid simulator that tries to flood everything :)
+// http://forum.mc-server.org/showthread.php?tid=565
+
+#include "Globals.h"
+
+#include "FloodyFluidSimulator.h"
+#include "../World.h"
+#include "../Chunk.h"
+#include "../BlockArea.h"
+#include "../Blocks/BlockHandler.h"
+
+
+
+
+
+// Enable or disable detailed logging
+#if 0
+	#define FLOG LOGD
+#else
+	#define FLOG(...)
+#endif
+
+
+
+
+
+cFloodyFluidSimulator::cFloodyFluidSimulator(
+	cWorld & a_World,
+	BLOCKTYPE a_Fluid,
+	BLOCKTYPE a_StationaryFluid,
+	NIBBLETYPE a_Falloff,
+	int a_TickDelay,
+	int a_NumNeighborsForSource
+) :
+	super(a_World, a_Fluid, a_StationaryFluid, a_TickDelay),
+	m_Falloff(a_Falloff),
+	m_NumNeighborsForSource(a_NumNeighborsForSource)
+{
+}
+
+
+
+
+
+void cFloodyFluidSimulator::SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	FLOG("Simulating block {%d, %d, %d}: block %d, meta %d", 
+		a_Chunk->GetPosX() * cChunkDef::Width + a_RelX, a_RelY, a_Chunk->GetPosZ() * cChunkDef::Width + a_RelZ,
+		a_Chunk->GetBlock(a_RelX, a_RelY, a_RelZ),
+		a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ)
+	);
+	
+	NIBBLETYPE MyMeta = a_Chunk->GetMeta(a_RelX, a_RelY, a_RelZ);
+	if (!IsAnyFluidBlock(a_Chunk->GetBlock(a_RelX, a_RelY, a_RelZ)))
+	{
+		// Can happen - if a block is scheduled for simulating and gets replaced in the meantime.
+		FLOG("  BadBlockType exit");
+		return;
+	}
+
+	if (MyMeta != 0)
+	{
+		// Source blocks aren't checked for tributaries, others are.
+		if (CheckTributaries(a_Chunk, a_RelX, a_RelY, a_RelZ, MyMeta))
+		{
+			// Has no tributary, has been decreased (in CheckTributaries()),
+			// no more processing needed (neighbors have been scheduled by the decrease)
+			FLOG("  CheckTributaries exit");
+			return;
+		}
+	}
+	
+	// New meta for the spreading to neighbors:
+	// If this is a source block or was falling, the new meta is just the falloff
+	// Otherwise it is the current meta plus falloff (may be larger than max height, will be checked later)
+	NIBBLETYPE NewMeta = ((MyMeta == 0) || ((MyMeta & 0x08) != 0)) ? m_Falloff : (MyMeta + m_Falloff);
+	bool SpreadFurther = true;
+	if (a_RelY > 0)
+	{
+		BLOCKTYPE Below = a_Chunk->GetBlock(a_RelX, a_RelY - 1, a_RelZ);
+		if (IsPassableForFluid(Below) || IsBlockLava(Below) || IsBlockWater(Below))
+		{
+			// Spread only down, possibly washing away what's there or turning lava to stone / cobble / obsidian:
+			SpreadToNeighbor(a_Chunk, a_RelX, a_RelY - 1, a_RelZ, 8);
+			SpreadFurther = false;
+		}
+		// If source creation is on, check for it here:
+		else if (
+			(m_NumNeighborsForSource > 0) &&  // Source creation is on
+			(MyMeta == m_Falloff) &&          // Only exactly one block away from a source (fast bail-out)
+			!IsPassableForFluid(Below) &&     // Only exactly 1 block deep
+			CheckNeighborsForSource(a_Chunk, a_RelX, a_RelY, a_RelZ)  // Did we create a source?
+		)
+		{
+			// We created a source, no more spreading is to be done now
+			// Also has been re-scheduled for ticking in the next wave, so no marking is needed
+			return;
+		}
+	}
+	
+	if (SpreadFurther && (NewMeta < 8))
+	{
+		// Spread to the neighbors:
+		SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ,     NewMeta);
+		SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ,     NewMeta);
+		SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ - 1, NewMeta);
+		SpreadToNeighbor(a_Chunk, a_RelX,     a_RelY, a_RelZ + 1, NewMeta);
+	}
+	
+	// Mark as processed:
+	a_Chunk->FastSetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, MyMeta);
+}
+
+
+
+
+
+bool cFloodyFluidSimulator::CheckTributaries(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_MyMeta)
+{
+	// If we have a section above, check if there's fluid above this block that would feed it:
+	if (a_RelY < cChunkDef::Height - 1)
+	{
+		if (IsAnyFluidBlock(a_Chunk->GetBlock(a_RelX, a_RelY + 1, a_RelZ)))
+		{
+			// This block is fed from above, no more processing needed
+			FLOG("  Fed from above");
+			return false;
+		}
+	}
+
+	// Not fed from above, check if there's a feed from the side (but not if it's a downward-flowing block):
+	if (a_MyMeta != 8)
+	{
+		BLOCKTYPE BlockType;
+		NIBBLETYPE BlockMeta;
+		static const Vector3i Coords[] =
+		{
+			Vector3i( 1, 0,  0),
+			Vector3i(-1, 0,  0),
+			Vector3i( 0, 0,  1),
+			Vector3i( 0, 0, -1),
+		} ;
+		for (int i = 0; i < ARRAYCOUNT(Coords); i++)
+		{
+			if (!a_Chunk->UnboundedRelGetBlock(a_RelX + Coords[i].x, a_RelY, a_RelZ + Coords[i].z, BlockType, BlockMeta))
+			{
+				continue;
+			}
+			if (IsAllowedBlock(BlockType) && IsHigherMeta(BlockMeta, a_MyMeta))
+			{
+				// This block is fed, no more processing needed
+				FLOG("  Fed from {%d, %d, %d}, type %d, meta %d",
+					a_Chunk->GetPosX() * cChunkDef::Width + a_RelX + Coords[i].x,
+					a_RelY,
+					a_Chunk->GetPosZ() * cChunkDef::Width + a_RelZ + Coords[i].z,
+					BlockType, BlockMeta
+				);
+				return false;
+			}
+		}  // for i - Coords[]
+	}  // if not fed from above
+	
+	// Block is not fed, decrease by m_Falloff levels:
+	if (a_MyMeta >= 8)
+	{
+		FLOG("  Not fed and downwards, turning into non-downwards meta %d", m_Falloff);
+		a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, m_Falloff);
+	}
+	else
+	{
+		a_MyMeta += m_Falloff;
+		if (a_MyMeta < 8)
+		{
+			FLOG("  Not fed, decreasing from %d to %d", a_MyMeta - m_Falloff, a_MyMeta);
+			a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_StationaryFluidBlock, a_MyMeta);
+		}
+		else
+		{
+			FLOG("  Not fed, meta %d, erasing altogether", a_MyMeta);
+			a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_AIR, 0);
+		}
+	}
+	return true;
+}
+
+
+
+
+
+void cFloodyFluidSimulator::SpreadToNeighbor(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta)
+{
+	ASSERT(a_NewMeta <= 8);  // Invalid meta values
+	ASSERT(a_NewMeta > 0);  // Source blocks aren't spread
+	
+	BLOCKTYPE BlockType;
+	NIBBLETYPE BlockMeta;
+	if (!a_NearChunk->UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockType, BlockMeta))
+	{
+		// Chunk not available
+		return;
+	}
+	
+	if (IsAllowedBlock(BlockType))
+	{
+		if ((BlockMeta == a_NewMeta) || IsHigherMeta(BlockMeta, a_NewMeta))
+		{
+			// Don't spread there, there's already a higher or same level there
+			return;
+		}
+	}
+
+	// Check water - lava interaction:
+	if (m_FluidBlock == E_BLOCK_LAVA)
+	{
+		if (IsBlockWater(BlockType))
+		{
+			// Lava flowing into water, change to stone / cobblestone based on direction:
+			BLOCKTYPE NewBlock = (a_NewMeta == 8) ? E_BLOCK_STONE : E_BLOCK_COBBLESTONE;
+			FLOG("  Lava flowing into water, turning water at rel {%d, %d, %d} into stone", 
+				a_RelX, a_RelY, a_RelZ,
+				ItemTypeToString(NewBlock).c_str()
+			);
+			a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, NewBlock, 0);
+			m_World.BroadcastSoundEffect("random.fizz", a_RelX * 8, a_RelY * 8, a_RelZ * 8, 0.5f, 1.5f);
+			return;
+		}
+	}
+	else if (m_FluidBlock == E_BLOCK_WATER)
+	{
+		if (IsBlockLava(BlockType))
+		{
+			// Water flowing into lava, change to cobblestone / obsidian based on dest block:
+			BLOCKTYPE NewBlock = (BlockMeta == 0) ? E_BLOCK_OBSIDIAN : E_BLOCK_COBBLESTONE;
+			FLOG("  Water flowing into lava, turning lava at rel {%d, %d, %d} into %s", 
+				a_RelX, a_RelY, a_RelZ, ItemTypeToString(NewBlock).c_str()
+			);
+			a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, NewBlock, 0);
+			m_World.BroadcastSoundEffect("random.fizz", a_RelX * 8, a_RelY * 8, a_RelZ * 8, 0.5f, 1.5f);
+			return;
+		}
+	}
+	else
+	{
+		ASSERT(!"Unknown fluid!");
+	}
+	
+	if (!IsPassableForFluid(BlockType))
+	{
+		// Can't spread there
+		return;
+	}
+	
+	// Wash away the block there, if possible:
+	if (CanWashAway(BlockType))
+	{
+		cBlockHandler * Handler = BlockHandler(BlockType);
+		if (Handler->DoesDropOnUnsuitable())
+		{
+			Handler->DropBlock(
+				&m_World, NULL, 
+				a_NearChunk->GetPosX() * cChunkDef::Width + a_RelX, 
+				a_RelY,
+				a_NearChunk->GetPosZ() * cChunkDef::Width + a_RelZ
+			);
+		}
+	}  // if (CanWashAway)
+	
+	// Spread:
+	FLOG("  Spreading to {%d, %d, %d} with meta %d", 
+		a_NearChunk->GetPosX() * cChunkDef::Width + a_RelX,
+		a_RelY,
+		a_NearChunk->GetPosZ() * cChunkDef::Width + a_RelZ,
+		a_NewMeta
+	);
+	a_NearChunk->UnboundedRelSetBlock(a_RelX, a_RelY, a_RelZ, m_FluidBlock, a_NewMeta);
+}
+
+
+
+
+
+bool cFloodyFluidSimulator::CheckNeighborsForSource(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	FLOG("  Checking neighbors for source creation");
+	
+	static const Vector3i NeighborCoords[] =
+	{
+		Vector3i(-1, 0,  0),
+		Vector3i( 1, 0,  0),
+		Vector3i( 0, 0, -1),
+		Vector3i( 0, 0,  1),
+	} ;
+	
+	int NumNeeded = m_NumNeighborsForSource;
+	for (int i = 0; i < ARRAYCOUNT(NeighborCoords); i++)
+	{
+		int x = a_RelX + NeighborCoords[i].x;
+		int y = a_RelY + NeighborCoords[i].y;
+		int z = a_RelZ + NeighborCoords[i].z;
+		BLOCKTYPE BlockType;
+		NIBBLETYPE BlockMeta;
+		if (!a_Chunk->UnboundedRelGetBlock(x, y, z, BlockType, BlockMeta))
+		{
+			// Neighbor not available, skip it
+			continue;
+		}
+		// FLOG("   Neighbor at {%d, %d, %d}: %s", x, y, z, ItemToFullString(cItem(BlockType, 1, BlockMeta)).c_str());
+		if ((BlockMeta == 0) && IsAnyFluidBlock(BlockType))
+		{
+			NumNeeded--;
+			// FLOG("    Found a neighbor source at {%d, %d, %d}, NumNeeded := %d", x, y, z, NumNeeded);
+			if (NumNeeded == 0)
+			{
+				// Found enough, turn into a source and bail out
+				// FLOG("    Found enough neighbor sources, turning into a source");
+				a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, m_FluidBlock, 0);
+				return true;
+			}
+		}
+	}
+	// FLOG("    Not enough neighbors for turning into a source, NumNeeded = %d", NumNeeded);
+	return false;
+}
+
+
+
+
diff --git a/src/Simulator/FloodyFluidSimulator.h b/src/Simulator/FloodyFluidSimulator.h
new file mode 100644
index 000000000..c4af2e246
--- /dev/null
+++ b/src/Simulator/FloodyFluidSimulator.h
@@ -0,0 +1,53 @@
+
+// FloodyFluidSimulator.h
+
+// Interfaces to the cFloodyFluidSimulator that represents a fluid simulator that tries to flood everything :)
+// http://forum.mc-server.org/showthread.php?tid=565
+
+
+
+
+
+#pragma once
+
+#include "DelayedFluidSimulator.h"
+
+
+
+
+
+// fwd:
+class cBlockArea;
+
+
+
+
+
+class cFloodyFluidSimulator :
+	public cDelayedFluidSimulator
+{
+	typedef cDelayedFluidSimulator super;
+	
+public:
+	cFloodyFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid, NIBBLETYPE a_Falloff, int a_TickDelay, int a_NumNeighborsForSource);
+	
+protected:
+	NIBBLETYPE m_Falloff;
+	int        m_NumNeighborsForSource;
+	
+	// cDelayedFluidSimulator overrides:
+	virtual void SimulateBlock(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ) override;
+	
+	/// Checks tributaries, if not fed, decreases the block's level and returns true
+	bool CheckTributaries(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_MyMeta);
+
+	/// Spreads into the specified block, if the blocktype there allows. a_Area is for checking.
+	void SpreadToNeighbor(cChunk * a_NearChunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta);
+	
+	/// Checks if there are enough neighbors to create a source at the coords specified; turns into source and returns true if so
+	bool CheckNeighborsForSource(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+} ;
+
+
+
+
diff --git a/src/Simulator/FluidSimulator.cpp b/src/Simulator/FluidSimulator.cpp
new file mode 100644
index 000000000..dac666484
--- /dev/null
+++ b/src/Simulator/FluidSimulator.cpp
@@ -0,0 +1,212 @@
+
+#include "Globals.h"
+
+#include "FluidSimulator.h"
+#include "../World.h"
+
+
+
+
+
+cFluidSimulator::cFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid) :
+	super(a_World),
+	m_FluidBlock(a_Fluid),
+	m_StationaryFluidBlock(a_StationaryFluid)
+{
+}
+
+
+
+
+
+bool cFluidSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
+{
+	return ((a_BlockType == m_FluidBlock) || (a_BlockType == m_StationaryFluidBlock));
+}
+
+
+
+
+
+bool cFluidSimulator::CanWashAway(BLOCKTYPE a_BlockType)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_BROWN_MUSHROOM:
+		case E_BLOCK_CACTUS:
+		case E_BLOCK_COBWEB:
+		case E_BLOCK_CROPS:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_RAIL:
+		case E_BLOCK_REDSTONE_TORCH_OFF:
+		case E_BLOCK_REDSTONE_TORCH_ON:
+		case E_BLOCK_REDSTONE_WIRE:
+		case E_BLOCK_RED_MUSHROOM:
+		case E_BLOCK_RED_ROSE:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_SUGARCANE:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_TORCH:
+		case E_BLOCK_YELLOW_FLOWER:
+		{
+			return true;
+		}
+		default:
+		{
+			return false;
+		}
+	}
+}
+
+
+
+
+
+bool cFluidSimulator::IsSolidBlock(BLOCKTYPE a_BlockType)
+{
+	return !IsPassableForFluid(a_BlockType);
+}
+
+
+
+
+
+bool cFluidSimulator::IsPassableForFluid(BLOCKTYPE a_BlockType)
+{
+	return (
+		(a_BlockType == E_BLOCK_AIR) ||
+		(a_BlockType == E_BLOCK_FIRE) ||
+		IsAllowedBlock(a_BlockType) ||
+		CanWashAway(a_BlockType)
+	);
+}
+
+
+
+
+
+bool cFluidSimulator::IsHigherMeta(NIBBLETYPE a_Meta1, NIBBLETYPE a_Meta2)
+{
+	if (a_Meta1 == 0)
+	{
+		// Source block is higher than anything, even itself.
+		return true;
+	}
+	if ((a_Meta1 & 0x08) != 0)
+	{
+		// Falling fluid is higher than anything, including self
+		return true;
+	}
+	
+	if (a_Meta2 == 0)
+	{
+		// Second block is a source and first block isn't
+		return false;
+	}
+	if ((a_Meta2 & 0x08) != 0)
+	{
+		// Second block is falling and the first one is neither a source nor falling
+		return false;
+	}
+	
+	// All special cases have been handled, now it's just a raw comparison:
+	return (a_Meta1 < a_Meta2);
+}
+
+
+
+
+
+// TODO Not working very well yet :s
+Direction cFluidSimulator::GetFlowingDirection(int a_X, int a_Y, int a_Z, bool a_Over)
+{
+	if ((a_Y < 0) || (a_Y >= cChunkDef::Height))
+	{
+		return NONE;
+	}
+	BLOCKTYPE BlockID = m_World.GetBlock(a_X, a_Y, a_Z);
+	if (!IsAllowedBlock(BlockID))	// No Fluid -> No Flowing direction :D
+	{
+		return NONE;
+	}
+
+	/*
+	Disabled because of causing problems and being useless atm
+	char BlockBelow = m_World.GetBlock(a_X, a_Y - 1, a_Z);		//If there is nothing or fluid below it -> dominating flow is down :D
+	if (BlockBelow == E_BLOCK_AIR || IsAllowedBlock(BlockBelow))
+		return Y_MINUS;
+	*/
+
+	NIBBLETYPE LowestPoint = m_World.GetBlockMeta(a_X, a_Y, a_Z);	//Current Block Meta so only lower points will be counted
+	int X = 0, Y = 0, Z = 0;									//Lowest Pos will be stored here
+
+	if (IsAllowedBlock(m_World.GetBlock(a_X, a_Y + 1, a_Z)) && a_Over)		//check for upper block to flow because this also affects the flowing direction
+	{
+		return GetFlowingDirection(a_X, a_Y + 1, a_Z, false);
+	}
+
+	std::vector< Vector3i * > Points;
+
+	Points.reserve(4);	//Already allocate 4 places :D
+
+	//add blocks around the checking pos
+	Points.push_back(new Vector3i(a_X - 1, a_Y, a_Z));
+	Points.push_back(new Vector3i(a_X + 1, a_Y, a_Z));
+	Points.push_back(new Vector3i(a_X, a_Y, a_Z + 1));
+	Points.push_back(new Vector3i(a_X, a_Y, a_Z - 1));
+
+	for (std::vector<Vector3i *>::iterator it = Points.begin(); it < Points.end(); it++)
+	{
+		Vector3i *Pos = (*it);
+		char BlockID = m_World.GetBlock(Pos->x, Pos->y, Pos->z);
+		if(IsAllowedBlock(BlockID))
+		{
+			char Meta = m_World.GetBlockMeta(Pos->x, Pos->y, Pos->z);
+
+			if(Meta > LowestPoint)
+			{
+				LowestPoint = Meta;
+				X = Pos->x;
+				Y = Pos->y;
+				Z = Pos->z;
+			}
+		}else if(BlockID == E_BLOCK_AIR)
+		{
+			LowestPoint = 9;		//This always dominates
+			X = Pos->x;
+			Y = Pos->y;
+			Z = Pos->z;
+		
+		}
+		delete Pos;
+	}
+
+	if (LowestPoint == m_World.GetBlockMeta(a_X, a_Y, a_Z))
+		return NONE;
+
+	if (a_X - X > 0)
+	{
+		return X_MINUS;
+	}
+
+	if (a_X - X < 0)
+	{
+		return X_PLUS;
+	}
+
+	if (a_Z - Z > 0)
+	{
+		return Z_MINUS;
+	}
+
+	if (a_Z - Z < 0)
+	{
+		return Z_PLUS;
+	}
+
+	return NONE;
+}
+
+
+
+
diff --git a/src/Simulator/FluidSimulator.h b/src/Simulator/FluidSimulator.h
new file mode 100644
index 000000000..672b740a2
--- /dev/null
+++ b/src/Simulator/FluidSimulator.h
@@ -0,0 +1,75 @@
+
+#pragma once
+
+#include "Simulator.h"
+
+
+
+
+
+enum Direction
+{
+	X_PLUS,
+	X_MINUS,
+	Y_PLUS,
+	Y_MINUS,
+	Z_PLUS,
+	Z_MINUS,
+	NONE
+};
+
+
+
+
+
+/** This is a base class for all fluid simulator data classes.
+Needed so that cChunk can properly delete instances of fluid simulator data, no matter what simulator it's using
+*/
+class cFluidSimulatorData
+{
+public:
+	virtual ~cFluidSimulatorData() {}
+} ;
+
+
+
+
+
+class cFluidSimulator :
+	public cSimulator
+{
+	typedef cSimulator super;
+	
+public:
+	cFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid);
+
+	// cSimulator overrides:
+	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) override;
+	
+	/// Gets the flowing direction. If a_Over is true also the block over the current block affects the direction (standard)
+	virtual Direction GetFlowingDirection(int a_X, int a_Y, int a_Z, bool a_Over = true);
+	
+	/// Creates a ChunkData object for the simulator to use. The simulator returns the correct object type.
+	virtual cFluidSimulatorData * CreateChunkData(void) { return NULL; }
+	
+	bool IsFluidBlock          (BLOCKTYPE a_BlockType) const { return (a_BlockType == m_FluidBlock); }
+	bool IsStationaryFluidBlock(BLOCKTYPE a_BlockType) const { return (a_BlockType == m_StationaryFluidBlock); }
+	bool IsAnyFluidBlock       (BLOCKTYPE a_BlockType) const { return ((a_BlockType == m_FluidBlock) || (a_BlockType == m_StationaryFluidBlock)); }
+	
+	static bool CanWashAway(BLOCKTYPE a_BlockType);
+	
+	bool IsSolidBlock      (BLOCKTYPE a_BlockType);
+	bool IsPassableForFluid(BLOCKTYPE a_BlockType);
+	
+	/// Returns true if a_Meta1 is a higher fluid than a_Meta2. Takes source blocks into account.
+	bool IsHigherMeta(NIBBLETYPE a_Meta1, NIBBLETYPE a_Meta2);
+	
+protected:
+	BLOCKTYPE m_FluidBlock;            // The fluid block type that needs simulating
+	BLOCKTYPE m_StationaryFluidBlock;  // The fluid block type that indicates no simulation is needed
+} ;
+
+
+
+
+
diff --git a/src/Simulator/NoopFluidSimulator.h b/src/Simulator/NoopFluidSimulator.h
new file mode 100644
index 000000000..8f894433f
--- /dev/null
+++ b/src/Simulator/NoopFluidSimulator.h
@@ -0,0 +1,36 @@
+
+// NoopFluidSimulator.h
+
+// Declares the cNoopFluidSimulator class representing a fluid simulator that performs nothing, it ignores all blocks
+
+
+
+
+
+#pragma once
+
+#include "FluidSimulator.h"
+
+
+
+
+
+class cNoopFluidSimulator :
+	public cFluidSimulator
+{
+	typedef cFluidSimulator super;
+	
+public:
+	cNoopFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid) :
+		super(a_World, a_Fluid, a_StationaryFluid)
+	{
+	}
+
+	// cSimulator overrides:
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override {}
+	virtual void Simulate(float a_Dt) override {}
+} ;
+
+
+
+
diff --git a/src/Simulator/RedstoneSimulator.cpp b/src/Simulator/RedstoneSimulator.cpp
new file mode 100644
index 000000000..81d4e26f6
--- /dev/null
+++ b/src/Simulator/RedstoneSimulator.cpp
@@ -0,0 +1,1198 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "RedstoneSimulator.h"
+#include "../BlockEntities/DropSpenserEntity.h"
+#include "../Entities/TNTEntity.h"
+#include "../Blocks/BlockTorch.h"
+#include "../Blocks/BlockDoor.h"
+#include "../Piston.h"
+
+
+
+
+
+cRedstoneSimulator::cRedstoneSimulator(cWorld & a_World)
+	: super(a_World)
+{
+}
+
+
+
+
+
+cRedstoneSimulator::~cRedstoneSimulator()
+{
+}
+
+
+
+
+
+void cRedstoneSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
+	{
+		return;
+	}
+	else if ((a_BlockY < 0) || (a_BlockY > cChunkDef::Height))
+	{
+		return;
+	}
+
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
+
+	if (!IsAllowedBlock(a_Chunk->GetBlock(RelX, a_BlockY, RelZ)))
+	{
+		return;
+	}
+
+	// Check for duplicates:
+	cRedstoneSimulatorChunkData & ChunkData = a_Chunk->GetRedstoneSimulatorData();
+	for (cRedstoneSimulatorChunkData::iterator itr = ChunkData.begin(); itr != ChunkData.end(); ++itr)
+	{
+		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ))
+		{
+			return;
+		}
+	}
+
+	ChunkData.push_back(cCoordWithInt(RelX, a_BlockY, RelZ));
+}
+
+
+
+
+
+void cRedstoneSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{
+	cRedstoneSimulatorChunkData & ChunkData = a_Chunk->GetRedstoneSimulatorData();
+	if (ChunkData.empty())
+	{
+		return;
+	}
+
+	int BaseX = a_Chunk->GetPosX() * cChunkDef::Width;
+	int BaseZ = a_Chunk->GetPosZ() * cChunkDef::Width;
+
+	for (cRedstoneSimulatorChunkData::iterator dataitr = ChunkData.begin(), end = ChunkData.end(); dataitr != end;)
+	{
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(dataitr->x, dataitr->y, dataitr->z);
+		if (!IsAllowedBlock(BlockType))
+		{
+			dataitr = ChunkData.erase(dataitr);
+			continue;
+		}
+
+		// Check to see if PoweredBlocks have invalid items (source is air or unpowered)
+		for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end();)
+		{
+			sPoweredBlocks & Change = *itr;
+
+			int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
+			int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
+
+			BLOCKTYPE SourceBlockType;
+			NIBBLETYPE SourceBlockMeta;
+			a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta);
+
+			if (SourceBlockType != Change.a_SourceBlock)
+			{
+				itr = m_PoweredBlocks.erase(itr);
+				LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
+			}
+			else if (
+				// Changeable sources
+				((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
+				((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
+				((SourceBlockType == E_BLOCK_DETECTOR_RAIL) && (SourceBlockMeta & 0x08) == 0x08) ||
+				(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
+				)
+			{
+				itr = m_PoweredBlocks.erase(itr);
+				LOGD("cRedstoneSimulator: Erased block %s from powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
+			}
+			else
+			{
+				itr++;
+			}
+		}
+
+		// Check to see if LinkedPoweredBlocks have invalid items: source, block powered through, or power destination block has changed
+		for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end();)
+		{
+			sLinkedPoweredBlocks & Change = *itr;
+			
+			int RelX = Change.a_SourcePos.x - a_ChunkX * cChunkDef::Width;
+			int RelZ = Change.a_SourcePos.z - a_ChunkZ * cChunkDef::Width;
+			int MidRelX = Change.a_MiddlePos.x - a_ChunkX * cChunkDef::Width;
+			int MidRelZ = Change.a_MiddlePos.z - a_ChunkZ * cChunkDef::Width;
+
+			BLOCKTYPE SourceBlockType;
+			NIBBLETYPE SourceBlockMeta;
+			BLOCKTYPE MiddleBlockType;
+			a_Chunk->UnboundedRelGetBlock(RelX, Change.a_SourcePos.y, RelZ, SourceBlockType, SourceBlockMeta);
+			a_Chunk->UnboundedRelGetBlockType(MidRelX, Change.a_MiddlePos.y, MidRelZ, MiddleBlockType);
+
+			if (SourceBlockType != Change.a_SourceBlock)
+			{
+				itr = m_LinkedPoweredBlocks.erase(itr);
+				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past block type mismatch", ItemToFullString(Change.a_SourceBlock));
+			}
+			else if (MiddleBlockType != Change.a_MiddleBlock)
+			{
+				itr = m_LinkedPoweredBlocks.erase(itr);
+				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past middle block mismatch", ItemToFullString(Change.a_SourceBlock));
+			}
+			else if (
+				// Things that can send power through a block but which depends on meta
+				((SourceBlockType == E_BLOCK_REDSTONE_WIRE) && (SourceBlockMeta == 0)) ||
+				((SourceBlockType == E_BLOCK_LEVER) && !IsLeverOn(SourceBlockMeta)) ||
+				(((SourceBlockType == E_BLOCK_STONE_BUTTON) || (SourceBlockType == E_BLOCK_WOODEN_BUTTON)) && (!IsButtonOn(SourceBlockMeta)))
+				)
+			{
+				itr = m_LinkedPoweredBlocks.erase(itr);
+				LOGD("cRedstoneSimulator: Erased block %s from linked powered blocks list due to present/past metadata mismatch", ItemToFullString(Change.a_SourceBlock));
+			}
+			else
+			{
+				itr++;
+			}
+		}
+
+		// PoweredBlock list was fine, now to the actual handling
+		int a_X = BaseX + dataitr->x;
+		int a_Z = BaseZ + dataitr->z;
+		switch (BlockType)
+		{
+			case E_BLOCK_BLOCK_OF_REDSTONE:		HandleRedstoneBlock(a_X, dataitr->y, a_Z);	break;
+			case E_BLOCK_LEVER: 				HandleRedstoneLever(a_X, dataitr->y, a_Z);	break;
+			case E_BLOCK_TNT:					HandleTNT(a_X, dataitr->y, a_Z);			break;
+			case E_BLOCK_REDSTONE_WIRE:			HandleRedstoneWire(a_X, dataitr->y, a_Z);	break;
+
+			case E_BLOCK_REDSTONE_TORCH_OFF:
+			case E_BLOCK_REDSTONE_TORCH_ON:
+			{
+				HandleRedstoneTorch(a_X, dataitr->y, a_Z, BlockType);
+				break;
+			}
+			case E_BLOCK_STONE_BUTTON:
+			case E_BLOCK_WOODEN_BUTTON:
+			{
+				HandleRedstoneButton(a_X, dataitr->y, a_Z, BlockType);
+				break;
+			}
+			case E_BLOCK_REDSTONE_REPEATER_OFF:
+			case E_BLOCK_REDSTONE_REPEATER_ON:
+			{
+				HandleRedstoneRepeater(a_X, dataitr->y, a_Z, BlockType);
+				break;
+			}
+			case E_BLOCK_PISTON:
+			case E_BLOCK_STICKY_PISTON:
+			{
+				HandlePiston(a_X, dataitr->y, a_Z);
+				break;
+			}
+			case E_BLOCK_REDSTONE_LAMP_OFF:
+			case E_BLOCK_REDSTONE_LAMP_ON:
+			{
+				HandleRedstoneLamp(a_X, dataitr->y, a_Z, BlockType);
+				break;
+			}
+			case E_BLOCK_DISPENSER:
+			case E_BLOCK_DROPPER:
+			{
+				HandleDropSpenser(a_X, dataitr->y, a_Z);
+				break;
+			}
+			case E_BLOCK_WOODEN_DOOR:
+			case E_BLOCK_IRON_DOOR:
+			{
+				HandleDoor(a_X, dataitr->y, a_Z);
+				break;
+			}
+			case E_BLOCK_ACTIVATOR_RAIL:
+			case E_BLOCK_DETECTOR_RAIL:
+			case E_BLOCK_POWERED_RAIL:
+			{
+				HandleRail(a_X, dataitr->y, a_Z, BlockType);
+				break;
+			}
+		}
+
+		++dataitr;
+	}
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneTorch(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState)
+{
+	static const struct // Define which directions the torch can power
+	{
+		int x, y, z;
+	} gCrossCoords[] =
+	{
+		{ 1, 0,  0},
+		{-1, 0,  0},
+		{ 0, 0,  1},
+		{ 0, 0, -1},
+		{ 0, 1,  0},
+	} ;
+
+	if (a_MyState == E_BLOCK_REDSTONE_TORCH_ON)
+	{
+		// Check if the block the torch is on is powered		
+		int X = a_BlockX; int Y = a_BlockY; int Z = a_BlockZ;
+		AddFaceDirection(X, Y, Z, cBlockTorchHandler::MetaDataToDirection(m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ)), true); // Inverse true to get the block torch is on
+
+		if (AreCoordsPowered(X, Y, Z))
+		{
+			// There was a match, torch goes off
+			m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_TORCH_OFF, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ));
+			return;
+		}
+
+		// Torch still on, make all 4(X, Z) + 1(Y) sides powered
+		for (int i = 0; i < ARRAYCOUNT(gCrossCoords); i++)
+		{
+			BLOCKTYPE Type = m_World.GetBlock(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z);
+			if (i < ARRAYCOUNT(gCrossCoords) - 1) // Sides of torch, not top (top is last)
+			{
+				if (
+					((IsMechanism(Type)) || (Type == E_BLOCK_REDSTONE_WIRE)) && // Is it a mechanism or wire? Not block/other torch etc.
+					(!Vector3i(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z).Equals(Vector3i(X, Y, Z))) // CAN'T power block is that it is on
+					)
+				{
+					SetBlockPowered(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_TORCH_ON);
+				}
+			}
+			else
+			{
+				// Top side, power whatever is there, including blocks
+				SetBlockPowered(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_TORCH_ON);
+				// Power all blocks surrounding block above torch
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YP, E_BLOCK_REDSTONE_TORCH_ON);
+			}
+		}
+
+		if (m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) != 0x5) // Is torch standing on ground? If NOT (i.e. on wall), power block beneath
+		{
+			BLOCKTYPE Type = m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ);
+
+			if ((IsMechanism(Type)) || (Type == E_BLOCK_REDSTONE_WIRE)) // Still can't make a normal block powered though!
+			{
+				SetBlockPowered(a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_TORCH_ON);
+			}
+		}
+	}
+	else
+	{
+		// Check if the block the torch is on is powered		
+		int X = a_BlockX; int Y = a_BlockY; int Z = a_BlockZ;
+		AddFaceDirection(X, Y, Z, cBlockTorchHandler::MetaDataToDirection(m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ)), true); // Inverse true to get the block torch is on
+
+		// See if off state torch can be turned on again
+		if (AreCoordsPowered(X, Y, Z))
+		{
+			return; // Something matches, torch still powered
+		}
+
+		// Block torch on not powered, can be turned on again!
+		m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_TORCH_ON, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ));
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneBlock(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	SetAllDirsAsPowered(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_BLOCK_OF_REDSTONE);
+	SetBlockPowered(a_BlockX, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_BLOCK_OF_REDSTONE); // Set self as powered
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneLever(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	if (IsLeverOn(m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ)))
+	{
+		SetAllDirsAsPowered(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_LEVER);
+
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XM, E_BLOCK_LEVER);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XP, E_BLOCK_LEVER);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YM, E_BLOCK_LEVER);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YP, E_BLOCK_LEVER);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZM, E_BLOCK_LEVER);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZP, E_BLOCK_LEVER);
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneButton(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType)
+{
+	if (IsButtonOn(m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ)))
+	{
+		SetAllDirsAsPowered(a_BlockX, a_BlockY, a_BlockZ, a_BlockType);
+
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XM, a_BlockType);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XP, a_BlockType);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YM, a_BlockType);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YP, a_BlockType);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZM, a_BlockType);
+		SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZP, a_BlockType);
+	}
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneWire(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	static const struct // Define which directions the wire can receive power from
+	{
+		int x, y, z;
+	} gCrossCoords[] =
+	{
+		{ 1, 0,  0},
+		{-1, 0,  0},
+		{ 0, 0,  1},
+		{ 0, 0, -1},
+		{ 1, 1,  0}, // From here to end, check for wire placed on sides of blocks
+		{-1, 1,  0},
+		{ 0, 1,  1},
+		{ 0, 1, -1},
+		{ 1,-1,  0},
+		{-1,-1,  0},
+		{ 0,-1,  1},
+		{ 0,-1, -1},
+	} ;
+
+	// Check to see if directly beside a power source
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+	{
+		m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, 15); // Maximum power
+		SetBlockPowered(a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE); // Power block beneath
+	}
+	else
+	{
+		NIBBLETYPE MyMeta = m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
+		int TimesMetaSmaller = 0, TimesFoundAWire = 0;
+
+		for (int i = 0; i < ARRAYCOUNT(gCrossCoords); i++) // Loop through all directions to transfer or receive power
+		{
+			BLOCKTYPE SurroundType;
+			NIBBLETYPE SurroundMeta;
+			m_World.GetBlockTypeMeta(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z, SurroundType, SurroundMeta);
+
+			if (SurroundType == E_BLOCK_REDSTONE_WIRE)
+			{
+				TimesFoundAWire++;
+
+				if (SurroundMeta > 1) // Wires of power 1 or 0 cannot transfer power TO ME, don't bother checking
+				{
+					if (SurroundMeta > MyMeta) // Does surrounding wire have a higher power level than self?
+					{
+						m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, SurroundMeta - 1);
+					}
+				}
+				
+				if (SurroundMeta < MyMeta) // Go through all surroundings to see if self power is larger than everyone else's
+				{
+					TimesMetaSmaller++;
+				}
+			}			
+		}
+
+		if (TimesMetaSmaller == TimesFoundAWire)
+		{
+			// All surrounding metas were smaller - self must have been a wire that was
+			// transferring power to other wires around.
+			// However, self not directly powered anymore, so source must have been removed,
+			// therefore, self must be set to meta zero
+			m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, 0);
+			return; // No need to process block power sets because self not powered
+		}
+
+		SetBlockPowered(a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE); // Power block beneath
+	}
+
+	if (m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) != 0) // A powered wire
+	{
+		switch (GetWireDirection(a_BlockX, a_BlockY, a_BlockZ))
+		{
+			case REDSTONE_NONE:
+			{
+				SetAllDirsAsPowered(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE);
+
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XM, E_BLOCK_REDSTONE_WIRE);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XP, E_BLOCK_REDSTONE_WIRE);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YM, E_BLOCK_REDSTONE_WIRE);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_YP, E_BLOCK_REDSTONE_WIRE);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZM, E_BLOCK_REDSTONE_WIRE);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZP, E_BLOCK_REDSTONE_WIRE);
+				break;
+			}
+			case REDSTONE_X_POS:
+			{
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockPowered(a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE);
+				}
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XP, E_BLOCK_REDSTONE_WIRE);
+				break;
+			}
+			case REDSTONE_X_NEG:
+			{
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockPowered(a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE);
+				}
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XM, E_BLOCK_REDSTONE_WIRE);
+				break;
+			}
+			case REDSTONE_Z_POS:
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockPowered(a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE);
+				}
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZP, E_BLOCK_REDSTONE_WIRE);
+				break;
+			}
+			case REDSTONE_Z_NEG:
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockPowered(a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_WIRE);
+				}
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZM, E_BLOCK_REDSTONE_WIRE);
+				break;
+			}
+		}
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneRepeater(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState)
+{
+	// We do this so that the repeater can continually update block power status (without being affected by it's own block type, which would happen if the block powering code was in an IF statement)
+	bool IsOn = false;
+	if (a_MyState == E_BLOCK_REDSTONE_REPEATER_ON)
+	{
+		IsOn = true;
+	}
+
+	NIBBLETYPE a_Meta = m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ);
+
+	if (IsRepeaterPowered(a_BlockX, a_BlockY, a_BlockZ, a_Meta & 0x3))
+	{
+		if (!IsOn)
+		{
+			m_World.SetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_ON, a_Meta); // Only set if not on; SetBlock otherwise server doesn't set it in time for SimulateChunk's invalidation
+		}
+		switch (a_Meta & 0x3) // We only want the direction (bottom) bits
+		{
+			case 0x0:
+			{
+				SetBlockPowered(a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_ON);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZM, E_BLOCK_REDSTONE_REPEATER_ON);
+				break;
+			}
+			case 0x1:
+			{
+				SetBlockPowered(a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_ON);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XP, E_BLOCK_REDSTONE_REPEATER_ON);
+				break;
+			}
+			case 0x2:
+			{
+				SetBlockPowered(a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_ON);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_ZP, E_BLOCK_REDSTONE_REPEATER_ON);
+				break;
+			}
+			case 0x3:
+			{
+				SetBlockPowered(a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_ON);
+				SetDirectionLinkedPowered(a_BlockX, a_BlockY, a_BlockZ, BLOCK_FACE_XM, E_BLOCK_REDSTONE_REPEATER_ON);
+				break;
+			}
+		}
+	}
+	else
+	{
+		if (IsOn)
+		{
+			m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_REPEATER_OFF, a_Meta);
+		}
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandlePiston(int a_BlockX, int a_BlockY, int a_BlockZ)
+{	
+	cPiston Piston(&m_World);
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+	{
+		Piston.ExtendPiston(a_BlockX, a_BlockY, a_BlockZ);
+	}
+	else
+	{
+		Piston.RetractPiston(a_BlockX, a_BlockY, a_BlockZ);
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleDropSpenser(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	class cSetPowerToDropSpenser :
+		public cDropSpenserCallback
+	{
+		bool m_IsPowered;
+	public:
+		cSetPowerToDropSpenser(bool a_IsPowered) : m_IsPowered(a_IsPowered) {}
+				
+		virtual bool Item(cDropSpenserEntity * a_DropSpenser) override
+		{
+			a_DropSpenser->SetRedstonePower(m_IsPowered);
+			return false;
+		}
+	} DrSpSP (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ));
+
+	m_World.DoWithDropSpenserAt(a_BlockX, a_BlockY, a_BlockZ, DrSpSP);
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRedstoneLamp(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState)
+{
+	if (a_MyState == E_BLOCK_REDSTONE_LAMP_OFF)
+	{
+		if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+		{
+			m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_LAMP_ON, 0);
+		}
+	}
+	else
+	{
+		if (!AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+		{
+			m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_REDSTONE_LAMP_OFF, 0);
+		}
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleTNT(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+	{
+		m_World.BroadcastSoundEffect("random.fuse", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 0.5f, 0.6f);
+		m_World.SpawnPrimedTNT(a_BlockX + 0.5, a_BlockY + 0.5, a_BlockZ + 0.5, 4);  // 4 seconds to boom
+		m_World.FastSetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_AIR, 0);
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleDoor(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	if ((m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x08) == 0x08)
+	{
+		// Block position is located at top half of door
+		// Is Y - 1 both within world boundaries, a door block, and the bottom half of a door?
+		// The bottom half stores the open/closed information
+		if (
+			(a_BlockY - 1 >= 0) &&
+			((m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_WOODEN_DOOR) || (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_IRON_DOOR)) &&
+			(m_World.GetBlockMeta(a_BlockX, a_BlockY - 1, a_BlockZ & 0x08) == 0)
+			)
+		{
+			if ((m_World.GetBlockMeta(a_BlockX, a_BlockY - 1, a_BlockZ) & 0x04) == 0) // Closed door?
+			{
+				if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) // Powered? If so, toggle open
+				{
+					cBlockDoorHandler::ChangeDoor(&m_World, a_BlockX, a_BlockY, a_BlockZ);
+				}
+			}
+			else // Opened door
+			{
+				if (!AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) // Unpowered? Close if so
+				{
+					cBlockDoorHandler::ChangeDoor(&m_World, a_BlockX, a_BlockY, a_BlockZ);
+				}
+			}
+		}
+	}
+	else
+	{
+		if ((m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x04) == 0) // Closed door?
+		{
+			if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) // Powered? If so, toggle open
+			{
+				cBlockDoorHandler::ChangeDoor(&m_World, a_BlockX, a_BlockY, a_BlockZ);
+			}
+		}
+		else // Opened door
+		{
+			if (!AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) // Unpowered? Close if so
+			{
+				cBlockDoorHandler::ChangeDoor(&m_World, a_BlockX, a_BlockY, a_BlockZ);
+			}
+		}
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyType)
+{
+	switch (a_MyType)
+	{
+		case E_BLOCK_DETECTOR_RAIL:
+		{
+			if ((m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x08) == 0x08)
+			{
+				SetAllDirsAsPowered(a_BlockX, a_BlockY, a_BlockZ, a_MyType);
+			}
+			break;
+		}
+		case E_BLOCK_ACTIVATOR_RAIL:
+		case E_BLOCK_POWERED_RAIL:
+		{
+			if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ))
+			{
+				m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) | 0x08);
+			}
+			else
+			{
+				m_World.SetBlockMeta(a_BlockX, a_BlockY, a_BlockZ, m_World.GetBlockMeta(a_BlockX, a_BlockY, a_BlockZ) & 0x07);
+			}
+			break;
+		}
+	}
+}
+
+
+
+
+
+bool cRedstoneSimulator::AreCoordsPowered(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end(); ++itr) // Check powered list
+	{
+		sPoweredBlocks & Change = *itr;
+
+		if (Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
+		{
+			return true;
+		}
+	}
+
+	for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end(); ++itr) // Check linked powered list
+	{
+		sLinkedPoweredBlocks & Change = *itr;
+
+		if (Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ)))
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cRedstoneSimulator::IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta)
+{
+	// Check through powered blocks list
+	for (PoweredBlocksList::iterator itr = m_PoweredBlocks.begin(); itr != m_PoweredBlocks.end(); ++itr)
+	{
+		sPoweredBlocks & Change = *itr;
+
+		if (!Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ))) { continue; }
+
+		switch (a_Meta)
+		{
+			case 0x0:
+			{
+				// Flip the coords to check the back of the repeater
+				if (Change.a_SourcePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ + 1))) { return true; }
+				break;
+			}
+			case 0x1:
+			{
+				if (Change.a_SourcePos.Equals(Vector3i(a_BlockX - 1, a_BlockY, a_BlockZ))) { return true; }
+				break;
+			}
+			case 0x2:
+			{
+				if (Change.a_SourcePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ - 1))) { return true; }
+				break;
+			}
+			case 0x3:
+			{
+				if (Change.a_SourcePos.Equals(Vector3i(a_BlockX + 1, a_BlockY, a_BlockZ))) { return true; }
+				break;
+			}
+		}
+	}
+
+	// Check linked powered list, 'middle' blocks
+	for (LinkedBlocksList::iterator itr = m_LinkedPoweredBlocks.begin(); itr != m_LinkedPoweredBlocks.end(); ++itr)
+	{
+		sLinkedPoweredBlocks & Change = *itr;
+
+		if (!Change.a_BlockPos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ))) { continue; }
+
+		switch (a_Meta)
+		{
+			case 0x0:
+			{
+				if (Change.a_MiddlePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ + 1))) { return true; }
+				break;
+			}
+			case 0x1:
+			{
+				if (Change.a_MiddlePos.Equals(Vector3i(a_BlockX - 1, a_BlockY, a_BlockZ))) { return true; }
+				break;
+			}
+			case 0x2:
+			{
+				if (Change.a_MiddlePos.Equals(Vector3i(a_BlockX, a_BlockY, a_BlockZ - 1))) { return true; }
+				break;
+			}
+			case 0x3:
+			{
+				if (Change.a_MiddlePos.Equals(Vector3i(a_BlockX + 1, a_BlockY, a_BlockZ))) { return true; }
+				break;
+			}
+		}
+	}
+	return false; // Couldn't find power source behind repeater
+}
+
+
+
+
+
+void cRedstoneSimulator::SetDirectionLinkedPowered(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Direction, BLOCKTYPE a_SourceType)
+{
+	switch (a_Direction)
+	{
+		case BLOCK_FACE_XM:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE) // Wires can't power another wire through a block
+			{
+				if (m_World.GetBlock(a_BlockX - 2, a_BlockY, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 2, a_BlockY, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY + 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY + 1, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY - 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY - 1, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ + 1, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ - 1, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX - 2, a_BlockY, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY + 1, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY - 1, a_BlockZ, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ + 1, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ - 1, a_BlockX - 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}
+			break;
+		}
+		case BLOCK_FACE_XP:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE)
+			{
+				if (m_World.GetBlock(a_BlockX + 2, a_BlockY, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 2, a_BlockY, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY + 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY + 1, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY - 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY - 1, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ + 1, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ - 1, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX + 2, a_BlockY, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY + 1, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY - 1, a_BlockZ, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ + 1, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ - 1, a_BlockX + 1, a_BlockY, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}		
+			break;
+		}
+		case BLOCK_FACE_YM:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE)
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY - 2, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY - 2, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY - 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY - 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ + 1, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ - 1, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX, a_BlockY - 2, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ + 1, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ - 1, a_BlockX, a_BlockY - 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}
+			break;
+		}
+		case BLOCK_FACE_YP:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE)
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY + 2, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY + 2, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY + 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY + 1, a_BlockZ) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ + 1, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ - 1, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX, a_BlockY + 2, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ + 1, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ - 1, a_BlockX, a_BlockY + 1, a_BlockZ, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}		
+			break;
+		}
+		case BLOCK_FACE_ZM:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ - 1);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE)
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ - 2) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY, a_BlockZ - 2, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ - 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX, a_BlockY, a_BlockZ - 2, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ - 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}
+			break;
+		}
+		case BLOCK_FACE_ZP:
+		{
+			BLOCKTYPE MiddleBlock = m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ + 1);
+
+			if (a_SourceType == E_BLOCK_REDSTONE_WIRE)
+			{
+				if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ + 2) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY, a_BlockZ + 2, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY + 1, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+				if (m_World.GetBlock(a_BlockX, a_BlockY - 1, a_BlockZ + 1) != E_BLOCK_REDSTONE_WIRE)
+				{
+					SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				}
+			}
+			else
+			{
+				SetBlockLinkedPowered(a_BlockX, a_BlockY, a_BlockZ + 2, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX + 1, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX - 1, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY + 1, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+				SetBlockLinkedPowered(a_BlockX, a_BlockY - 1, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ + 1, a_BlockX, a_BlockY, a_BlockZ, a_SourceType, MiddleBlock);
+			}
+			break;
+		}
+		default:
+		{
+			ASSERT(!"Unhandled face direction when attempting to set blocks as linked powered!"); // Zombies, that wasn't supposed to happen...
+			break;
+		}
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::SetAllDirsAsPowered(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_SourceBlock)
+{
+	static const struct
+	{
+		int x, y, z;
+	} gCrossCoords[] =
+	{
+		{ 1, 0, 0 },
+		{-1, 0, 0 },
+		{ 0, 0, 1 },
+		{ 0, 0,-1 },
+		{ 0, 1, 0 },
+		{ 0,-1, 0 }
+	};
+
+	for (int i = 0; i < ARRAYCOUNT(gCrossCoords); i++) // Loop through struct to power all directions
+	{
+		SetBlockPowered(a_BlockX + gCrossCoords[i].x, a_BlockY + gCrossCoords[i].y, a_BlockZ + gCrossCoords[i].z, a_BlockX, a_BlockY, a_BlockZ, a_SourceBlock);
+	}
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::SetBlockPowered(int a_BlockX, int a_BlockY, int a_BlockZ, int a_SourceX, int a_SourceY, int a_SourceZ, BLOCKTYPE a_SourceBlock)
+{
+	if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_AIR) { return; } // Don't set air, fixes some bugs (wires powering themselves)
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) { return; } // Check for duplicates
+
+	sPoweredBlocks RC;
+	RC.a_BlockPos = Vector3i(a_BlockX, a_BlockY, a_BlockZ);
+	RC.a_SourcePos = Vector3i(a_SourceX, a_SourceY, a_SourceZ);
+	RC.a_SourceBlock = a_SourceBlock;
+	m_PoweredBlocks.push_back(RC);
+	return;
+}
+
+
+
+
+
+void cRedstoneSimulator::SetBlockLinkedPowered(int a_BlockX, int a_BlockY, int a_BlockZ,
+	int a_MiddleX, int a_MiddleY, int a_MiddleZ,
+	int a_SourceX, int a_SourceY, int a_SourceZ,
+	BLOCKTYPE a_SourceBlock, BLOCKTYPE a_MiddleBlock
+	)
+{
+	if (m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ) == E_BLOCK_AIR) { return; } // Don't set air, fixes some bugs (wires powering themselves)
+	if (AreCoordsPowered(a_BlockX, a_BlockY, a_BlockZ)) { return; } // Check for duplicates
+	if (!IsViableMiddleBlock(m_World.GetBlock(a_MiddleX, a_MiddleY, a_MiddleZ))) { return; } // See if middle block is viable
+
+	sLinkedPoweredBlocks RC;
+	RC.a_BlockPos = Vector3i(a_BlockX, a_BlockY, a_BlockZ);
+	RC.a_MiddlePos = Vector3i(a_MiddleX, a_MiddleY, a_MiddleZ);
+	RC.a_SourcePos = Vector3i(a_SourceX, a_SourceY, a_SourceZ);
+	RC.a_SourceBlock = a_SourceBlock;
+	RC.a_MiddleBlock = a_MiddleBlock;
+	m_LinkedPoweredBlocks.push_back(RC);
+	return;
+}
+
+
+
+
+
+cRedstoneSimulator::eRedstoneDirection cRedstoneSimulator::GetWireDirection(int a_BlockX, int a_BlockY, int a_BlockZ)
+{
+	int Dir = REDSTONE_NONE;
+
+	BLOCKTYPE NegX = m_World.GetBlock(a_BlockX - 1, a_BlockY, a_BlockZ);
+	if (IsPotentialSource(NegX))
+	{
+		Dir |= (REDSTONE_X_POS);
+	}
+	
+	BLOCKTYPE PosX = m_World.GetBlock(a_BlockX + 1, a_BlockY, a_BlockZ);
+	if (IsPotentialSource(PosX))
+	{
+		Dir |= (REDSTONE_X_NEG);
+	}
+	
+	BLOCKTYPE NegZ = m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ - 1);
+	if (IsPotentialSource(NegZ))
+	{
+		if ((Dir & REDSTONE_X_POS) && !(Dir & REDSTONE_X_NEG))  // corner
+		{
+			Dir ^= REDSTONE_X_POS;
+			Dir |= REDSTONE_X_NEG;
+		}
+		if ((Dir & REDSTONE_X_NEG) && !(Dir & REDSTONE_X_POS))  // corner
+		{
+			Dir ^= REDSTONE_X_NEG;
+			Dir |= REDSTONE_X_POS;
+		}
+		Dir |= REDSTONE_Z_POS;
+	}
+	
+	BLOCKTYPE PosZ = m_World.GetBlock(a_BlockX, a_BlockY, a_BlockZ + 1);
+	if (IsPotentialSource(PosZ))
+	{
+		if ((Dir & REDSTONE_X_POS) && !(Dir & REDSTONE_X_NEG))  // corner
+		{
+			Dir ^= REDSTONE_X_POS;
+			Dir |= REDSTONE_X_NEG;
+		}
+		if ((Dir & REDSTONE_X_NEG) && !(Dir & REDSTONE_X_POS))  // corner
+		{
+			Dir ^= REDSTONE_X_NEG;
+			Dir |= REDSTONE_X_POS;
+		}
+		Dir |= REDSTONE_Z_NEG;
+	}
+	return (eRedstoneDirection)Dir;
+}
+
+
+
+
+
+bool cRedstoneSimulator::IsLeverOn(NIBBLETYPE a_BlockMeta)
+{
+	// Extract the ON bit from metadata and return if true if it is set:
+	return ((a_BlockMeta & 0x8) == 0x8);
+}
+
+
+
+
+
+bool cRedstoneSimulator::IsButtonOn(NIBBLETYPE a_BlockMeta)
+{
+	return IsLeverOn(a_BlockMeta);
+}
+
+
+
+
diff --git a/src/Simulator/RedstoneSimulator.h b/src/Simulator/RedstoneSimulator.h
new file mode 100644
index 000000000..d3002394a
--- /dev/null
+++ b/src/Simulator/RedstoneSimulator.h
@@ -0,0 +1,234 @@
+
+#pragma once
+
+#include "Simulator.h"
+
+/// Per-chunk data for the simulator, specified individual chunks to simulate; 'Data' is not used
+typedef cCoordWithIntList cRedstoneSimulatorChunkData;
+
+
+
+
+
+class cRedstoneSimulator :
+	public cSimulator
+{
+	typedef cSimulator super;
+public:
+
+	cRedstoneSimulator(cWorld & a_World);
+	~cRedstoneSimulator();
+
+	virtual void Simulate(float a_Dt) override {}; // Not used in this simulator
+	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
+	virtual bool IsAllowedBlock( BLOCKTYPE a_BlockType ) override { return IsRedstone(a_BlockType); }
+
+	enum eRedstoneDirection
+	{
+		REDSTONE_NONE =  0,
+		REDSTONE_X_POS = 0x1,
+		REDSTONE_X_NEG = 0x2,
+		REDSTONE_Z_POS = 0x4,
+		REDSTONE_Z_NEG = 0x8,
+	};
+	eRedstoneDirection GetWireDirection(int a_BlockX, int a_BlockY, int a_BlockZ);
+
+private:
+
+	struct sPoweredBlocks // Define structure of the directly powered blocks list
+	{
+		Vector3i a_BlockPos; // Position of powered block
+		Vector3i a_SourcePos; // Position of source powering the block at a_BlockPos
+		BLOCKTYPE a_SourceBlock; // The source block type (for pistons pushing away sources and replacing with non source etc.)
+	};
+
+	struct sLinkedPoweredBlocks // Define structure of the indirectly powered blocks list (i.e. repeaters powering through a block to the block at the other side)
+	{
+		Vector3i a_BlockPos;
+		Vector3i a_MiddlePos;
+		Vector3i a_SourcePos;
+		BLOCKTYPE a_SourceBlock;
+		BLOCKTYPE a_MiddleBlock;
+	};
+	
+	typedef std::vector <sPoweredBlocks> PoweredBlocksList;
+	typedef std::vector <sLinkedPoweredBlocks> LinkedBlocksList;
+
+	PoweredBlocksList m_PoweredBlocks;
+	LinkedBlocksList m_LinkedPoweredBlocks;
+
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
+
+	// We want a_MyState for devices needing a full FastSetBlock (as opposed to meta) because with our simulation model, we cannot keep setting the block if it is already set correctly
+	// In addition to being non-performant, it would stop the player from actually breaking said device
+
+	/* ====== SOURCES ====== */
+	/// <summary>Handles the redstone torch</summary>
+	void HandleRedstoneTorch(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState);
+	/// <summary>Handles the redstone block</summary>
+	void HandleRedstoneBlock(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles levers</summary>
+	void HandleRedstoneLever(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles buttons</summary>
+	void HandleRedstoneButton(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType);
+	/* ==================== */
+
+	/* ====== CARRIERS ====== */
+	/// <summary>Handles redstone wire</summary>
+	void HandleRedstoneWire(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles repeaters</summary>
+	void HandleRedstoneRepeater(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState);
+	/* ====================== */
+
+	/* ====== DEVICES ====== */
+	/// <summary>Handles pistons</summary>
+	void HandlePiston(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles dispensers and droppers</summary>
+	void HandleDropSpenser(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles TNT (exploding)</summary>
+	void HandleTNT(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles redstone lamps</summary>
+	void HandleRedstoneLamp(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyState);
+	/// <summary>Handles doords</summary>
+	void HandleDoor(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Handles activator, detector, and powered rails</summary>
+	void HandleRail(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_MyType);
+	/* ===================== */
+
+	/* ====== Helper functions ====== */
+	/// <summary>Marks a block as powered</summary>
+	void SetBlockPowered(int a_BlockX, int a_BlockY, int a_BlockZ, int a_SourceX, int a_SourceY, int a_SourceZ, BLOCKTYPE a_SourceBlock);
+	/// <summary>Marks a block as being powered through another block</summary>
+	void SetBlockLinkedPowered(int a_BlockX, int a_BlockY, int a_BlockZ, int a_MiddleX, int a_MiddleY, int a_MiddleZ, int a_SourceX, int a_SourceY, int a_SourceZ, BLOCKTYPE a_SourceBlock, BLOCKTYPE a_MiddeBlock);
+	/// <summary>Marks the second block in a direction as linked powered</summary>
+	void SetDirectionLinkedPowered(int a_BlockX, int a_BlockY, int a_BlockZ, char a_Direction, BLOCKTYPE a_SourceBlock);
+	/// <summary>Marks all blocks immediately surrounding a coordinate as powered</summary>
+	void SetAllDirsAsPowered(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_SourceBlock);
+
+	/// <summary>Returns if a coordinate is powered or linked powered</summary>
+	bool AreCoordsPowered(int a_BlockX, int a_BlockY, int a_BlockZ);
+	/// <summary>Returns if a repeater is powered</summary>
+	bool IsRepeaterPowered(int a_BlockX, int a_BlockY, int a_BlockZ, NIBBLETYPE a_Meta);
+
+	/// <summary>Returns if lever metadata marks it as emitting power</summary>
+	bool IsLeverOn(NIBBLETYPE a_BlockMeta);
+	/// <summary>Returns if button metadata marks it as emitting power</summary>
+	bool IsButtonOn(NIBBLETYPE a_BlockMeta);
+	/* ============================== */
+
+	/* ====== Misc Functions ====== */
+	/// <summary>Returns if a block is viable to be the MiddleBlock of a SetLinkedPowered operation</summary>
+	inline static bool IsViableMiddleBlock(BLOCKTYPE Block)
+	{
+		if (!g_BlockIsSolid[Block]) { return false; }
+
+		switch (Block)
+		{
+			// Add SOLID but not viable middle blocks here
+			case E_BLOCK_REDSTONE_REPEATER_ON:
+			case E_BLOCK_REDSTONE_REPEATER_OFF:
+			{
+				return false;
+			}
+			default:
+			{
+				return true;
+			}
+		}
+	}
+
+	/// <summary>Returns if a block is a mechanism (something that accepts power and does something)</summary>
+	inline static bool IsMechanism(BLOCKTYPE Block)
+	{
+		switch (Block)
+		{
+			case E_BLOCK_ACTIVATOR_RAIL:
+			case E_BLOCK_PISTON:
+			case E_BLOCK_STICKY_PISTON:
+			case E_BLOCK_DISPENSER:
+			case E_BLOCK_DROPPER:
+			case E_BLOCK_FENCE_GATE:
+			case E_BLOCK_HOPPER:
+			case E_BLOCK_NOTE_BLOCK:
+			case E_BLOCK_TNT:
+			case E_BLOCK_TRAPDOOR:
+			case E_BLOCK_REDSTONE_LAMP_OFF:
+			case E_BLOCK_REDSTONE_LAMP_ON:
+			case E_BLOCK_WOODEN_DOOR:
+			case E_BLOCK_IRON_DOOR:
+			case E_BLOCK_REDSTONE_REPEATER_OFF:
+			case E_BLOCK_REDSTONE_REPEATER_ON:
+			case E_BLOCK_POWERED_RAIL:
+			{
+				return true;
+			}
+			default: return false;
+		}
+	}
+
+	/// <summary>Returns if a block has the potential to output power</summary>
+	inline static bool IsPotentialSource(BLOCKTYPE Block)
+	{
+		switch (Block)
+		{
+			case E_BLOCK_WOODEN_BUTTON:
+			case E_BLOCK_STONE_BUTTON:
+			case E_BLOCK_REDSTONE_WIRE:
+			case E_BLOCK_REDSTONE_TORCH_OFF:
+			case E_BLOCK_REDSTONE_TORCH_ON:
+			case E_BLOCK_LEVER:
+			case E_BLOCK_REDSTONE_REPEATER_ON:
+			case E_BLOCK_BLOCK_OF_REDSTONE:
+			case E_BLOCK_ACTIVE_COMPARATOR:
+			{
+				return true;
+			}
+			default: return false;
+		}
+	}
+
+	/// <summary>Returns if a block is any sort of redstone device</summary>
+	inline static bool IsRedstone(BLOCKTYPE Block)
+	{
+		switch (Block)
+		{
+			// All redstone devices, please alpha sort
+			case E_BLOCK_ACTIVATOR_RAIL:
+			case E_BLOCK_ACTIVE_COMPARATOR:
+			case E_BLOCK_BLOCK_OF_REDSTONE:
+			case E_BLOCK_DETECTOR_RAIL:
+			case E_BLOCK_DISPENSER:
+			case E_BLOCK_DAYLIGHT_SENSOR:
+			case E_BLOCK_DROPPER:
+			case E_BLOCK_FENCE_GATE:
+			case E_BLOCK_HEAVY_WEIGHTED_PRESSURE_PLATE:
+			case E_BLOCK_HOPPER:
+			case E_BLOCK_INACTIVE_COMPARATOR:
+			case E_BLOCK_IRON_DOOR:
+			case E_BLOCK_LEVER:
+			case E_BLOCK_LIGHT_WEIGHTED_PRESSURE_PLATE:
+			case E_BLOCK_NOTE_BLOCK:
+			case E_BLOCK_REDSTONE_LAMP_OFF:
+			case E_BLOCK_REDSTONE_LAMP_ON:
+			case E_BLOCK_REDSTONE_REPEATER_OFF:
+			case E_BLOCK_REDSTONE_REPEATER_ON:
+			case E_BLOCK_REDSTONE_TORCH_OFF:
+			case E_BLOCK_REDSTONE_TORCH_ON:
+			case E_BLOCK_REDSTONE_WIRE:
+			case E_BLOCK_STICKY_PISTON:
+			case E_BLOCK_STONE_BUTTON:
+			case E_BLOCK_STONE_PRESSURE_PLATE:
+			case E_BLOCK_TNT:
+			case E_BLOCK_TRAPDOOR:
+			case E_BLOCK_TRIPWIRE_HOOK:
+			case E_BLOCK_WOODEN_BUTTON:
+			case E_BLOCK_WOODEN_DOOR:
+			case E_BLOCK_WOODEN_PRESSURE_PLATE:
+			case E_BLOCK_PISTON:
+			{
+				 return true;
+			}
+			default: return false;
+		}
+	}
+};
\ No newline at end of file
diff --git a/src/Simulator/SandSimulator.cpp b/src/Simulator/SandSimulator.cpp
new file mode 100644
index 000000000..87fb83357
--- /dev/null
+++ b/src/Simulator/SandSimulator.cpp
@@ -0,0 +1,309 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "SandSimulator.h"
+#include "../World.h"
+#include "../BlockID.h"
+#include "../Defines.h"
+#include "../Entities/FallingBlock.h"
+#include "../Chunk.h"
+
+
+
+
+
+cSandSimulator::cSandSimulator(cWorld & a_World, cIniFile & a_IniFile) :
+	cSimulator(a_World),
+	m_TotalBlocks(0)
+{
+	m_IsInstantFall = a_IniFile.GetValueSetB("Physics", "SandInstantFall", false);
+}
+
+
+
+
+
+void cSandSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{
+	cSandSimulatorChunkData & ChunkData = a_Chunk->GetSandSimulatorData();
+	if (ChunkData.empty())
+	{
+		return;
+	}
+
+	int BaseX = a_Chunk->GetPosX() * cChunkDef::Width;
+	int BaseZ = a_Chunk->GetPosZ() * cChunkDef::Width;
+	for (cSandSimulatorChunkData::const_iterator itr = ChunkData.begin(), end = ChunkData.end(); itr != end; ++itr)
+	{
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(itr->x, itr->y, itr->z);
+		if (!IsAllowedBlock(BlockType) || (itr->y <= 0))
+		{
+			continue;
+		}
+
+		BLOCKTYPE BlockBelow = (itr->y > 0) ? a_Chunk->GetBlock(itr->x, itr->y - 1, itr->z) : E_BLOCK_AIR;
+		if (CanStartFallingThrough(BlockBelow))
+		{
+			if (m_IsInstantFall)
+			{
+				DoInstantFall(a_Chunk, itr->x, itr->y, itr->z);
+				continue;
+			}
+			Vector3i Pos;
+			Pos.x = itr->x + BaseX;
+			Pos.y = itr->y;
+			Pos.z = itr->z + BaseZ;
+			/*
+			LOGD(
+				"Creating a falling block at {%d, %d, %d} of type %s, block below: %s",
+				Pos.x, Pos.y, Pos.z, ItemTypeToString(BlockType).c_str(), ItemTypeToString(BlockBelow).c_str()
+			);
+			*/
+			cFallingBlock * FallingBlock = new cFallingBlock(Pos, BlockType, a_Chunk->GetMeta(itr->x, itr->y, itr->z));
+			FallingBlock->Initialize(&m_World);
+			a_Chunk->SetBlock(itr->x, itr->y, itr->z, E_BLOCK_AIR, 0);
+		}
+	}
+	m_TotalBlocks -= ChunkData.size();
+	ChunkData.clear();
+}
+
+
+
+
+
+bool cSandSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_SAND:
+		case E_BLOCK_GRAVEL:
+		case E_BLOCK_ANVIL:
+		case E_BLOCK_DRAGON_EGG:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+void cSandSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
+	{
+		return;
+	}
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
+	if (!IsAllowedBlock(a_Chunk->GetBlock(RelX, a_BlockY, RelZ)))
+	{
+		return;
+	}
+
+	// Check for duplicates:
+	cSandSimulatorChunkData & ChunkData = a_Chunk->GetSandSimulatorData();
+	for (cSandSimulatorChunkData::iterator itr = ChunkData.begin(); itr != ChunkData.end(); ++itr)
+	{
+		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ))
+		{
+			return;
+		}
+	}
+
+	m_TotalBlocks += 1;
+	ChunkData.push_back(cCoordWithInt(RelX, a_BlockY, RelZ));
+}
+
+
+
+
+
+bool cSandSimulator::CanStartFallingThrough(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_WATER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::CanContinueFallThrough(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_BROWN_MUSHROOM:
+		case E_BLOCK_COBWEB:
+		case E_BLOCK_CROPS:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_DETECTOR_RAIL:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_FLOWER_POT:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_LEVER:
+		case E_BLOCK_MINECART_TRACKS:
+		case E_BLOCK_MELON_STEM:
+		case E_BLOCK_POWERED_RAIL:
+		case E_BLOCK_PUMPKIN_STEM:
+		case E_BLOCK_REDSTONE_REPEATER_OFF:
+		case E_BLOCK_REDSTONE_REPEATER_ON:
+		case E_BLOCK_REDSTONE_TORCH_OFF:
+		case E_BLOCK_REDSTONE_TORCH_ON:
+		case E_BLOCK_REDSTONE_WIRE:
+		case E_BLOCK_RED_MUSHROOM:
+		case E_BLOCK_RED_ROSE:
+		case E_BLOCK_SIGN_POST:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_STONE_BUTTON:
+		case E_BLOCK_STONE_PRESSURE_PLATE:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_TORCH:
+		case E_BLOCK_TRAPDOOR:
+		case E_BLOCK_TRIPWIRE:
+		case E_BLOCK_TRIPWIRE_HOOK:
+		case E_BLOCK_WALLSIGN:
+		case E_BLOCK_WATER:
+		case E_BLOCK_WOODEN_BUTTON:
+		case E_BLOCK_WOODEN_PRESSURE_PLATE:
+		case E_BLOCK_YELLOW_FLOWER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::IsReplacedOnRematerialization(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_WATER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::DoesBreakFallingThrough(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_STONE_SLAB:
+		case E_BLOCK_WOODEN_SLAB:
+		{
+			return ((a_BlockMeta & 0x08) == 0);  // Only a bottom-slab breaks the block
+		}
+	}
+	return false;
+}
+
+
+
+
+
+void cSandSimulator::FinishFalling(
+	cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ,
+	BLOCKTYPE a_FallingBlockType, NIBBLETYPE a_FallingBlockMeta
+)
+{
+	ASSERT(a_BlockY < cChunkDef::Height);
+	
+	BLOCKTYPE CurrentBlockType = a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
+	if ((a_FallingBlockType == E_BLOCK_ANVIL) || IsReplacedOnRematerialization(CurrentBlockType))
+	{
+		// Rematerialize the material here:
+		a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, a_FallingBlockType, a_FallingBlockMeta);
+		return;
+	}
+	
+	// Create a pickup instead:
+	cItems Pickups;
+	Pickups.Add((ENUM_ITEM_ID)a_FallingBlockType, 1, a_FallingBlockMeta);
+	a_World->SpawnItemPickups(Pickups, (double)a_BlockX + 0.5, (double)a_BlockY + 0.5, (double)a_BlockZ + 0.5);
+}
+
+
+
+
+
+void cSandSimulator::DoInstantFall(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	// Remove the original block:
+	BLOCKTYPE  FallingBlockType;
+	NIBBLETYPE FallingBlockMeta;
+	a_Chunk->GetBlockTypeMeta(a_RelX, a_RelY, a_RelZ, FallingBlockType, FallingBlockMeta);
+	a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_AIR, 0);
+	
+	// Search for a place to put it:
+	for (int y = a_RelY - 1; y >= 0; y--)
+	{
+		BLOCKTYPE BlockType;
+		NIBBLETYPE BlockMeta;
+		a_Chunk->GetBlockTypeMeta(a_RelX, y, a_RelZ, BlockType, BlockMeta);
+		int BlockY;
+		if (DoesBreakFallingThrough(BlockType, BlockMeta))
+		{
+			BlockY = y;
+		}
+		else if (!CanContinueFallThrough(BlockType))
+		{
+			BlockY = y + 1;
+		}
+		else
+		{
+			// Can fall further down
+			continue;
+		}
+		
+		// Finish the fall at the found bottom:
+		int BlockX = a_RelX + a_Chunk->GetPosX() * cChunkDef::Width;
+		int BlockZ = a_RelZ + a_Chunk->GetPosZ() * cChunkDef::Width;
+		FinishFalling(&m_World, BlockX, BlockY, BlockZ, FallingBlockType, FallingBlockMeta);
+		return;
+	}
+	
+	// The block just "fell off the world" without leaving a trace
+}
+
+
+
+
diff --git a/src/Simulator/SandSimulator.h b/src/Simulator/SandSimulator.h
new file mode 100644
index 000000000..6e9ea15ac
--- /dev/null
+++ b/src/Simulator/SandSimulator.h
@@ -0,0 +1,63 @@
+
+#pragma once
+
+#include "Simulator.h"
+
+
+
+
+
+/// Despite the class name, this simulator takes care of all blocks that fall when suspended in the air.
+class cSandSimulator :
+	public cSimulator
+{
+public:
+	cSandSimulator(cWorld & a_World, cIniFile & a_IniFile);
+
+	// cSimulator overrides:
+	virtual void Simulate(float a_Dt) override {}  // Unused in this simulator
+	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) override;
+	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) override;
+	
+	/// Returns true if a falling-able block can start falling through the specified block type
+	static bool CanStartFallingThrough(BLOCKTYPE a_BlockType);
+	
+	/// Returns true if an already-falling block can pass through the specified block type (e. g. torch)
+	static bool CanContinueFallThrough(BLOCKTYPE a_BlockType);
+	
+	/// Returns true if the falling block rematerializing will replace the specified block type (e. g. tall grass)
+	static bool IsReplacedOnRematerialization(BLOCKTYPE a_BlockType);
+	
+	/// Returns true if the specified block breaks falling blocks while they fall through it (e. g. halfslabs)
+	static bool DoesBreakFallingThrough(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta);
+	
+	/** Called when a block finishes falling at the specified coords, either by insta-fall,
+	or through cFallingBlock entity.
+	It either rematerializes the block (a_FallingBlockType) at the specified coords, or creates a pickup,
+	based on the block currently present in the world at the dest specified coords
+	*/
+	static void FinishFalling(
+		cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ, 
+		BLOCKTYPE a_FallingBlockType, NIBBLETYPE a_FallingBlockMeta
+	);
+
+protected:
+	bool m_IsInstantFall;  // If set to true, blocks don't fall using cFallingBlock entity, but instantly instead
+	
+	int  m_TotalBlocks;    // Total number of blocks currently in the queue for simulating
+	
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
+	
+	/// Performs the instant fall of the block - removes it from top, Finishes it at the bottom
+	void DoInstantFall(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ);
+};
+
+
+
+
+/// Per-chunk data for the simulator, specified individual chunks to simulate; Data is not used
+typedef cCoordWithIntList cSandSimulatorChunkData;
+
+
+
+
diff --git a/src/Simulator/Simulator.cpp b/src/Simulator/Simulator.cpp
new file mode 100644
index 000000000..06fd0f858
--- /dev/null
+++ b/src/Simulator/Simulator.cpp
@@ -0,0 +1,51 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "Simulator.h"
+#include "../World.h"
+#include "../Vector3i.h"
+#include "../BlockID.h"
+#include "../Defines.h"
+#include "../Chunk.h"
+
+
+
+
+
+cSimulator::cSimulator(cWorld & a_World)
+	: m_World(a_World)
+{
+}
+
+
+
+
+
+cSimulator::~cSimulator()
+{
+}
+
+
+
+
+
+void cSimulator::WakeUp(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	AddBlock(a_BlockX,     a_BlockY,     a_BlockZ,     a_Chunk);
+	AddBlock(a_BlockX - 1, a_BlockY,     a_BlockZ,     a_Chunk->GetNeighborChunk(a_BlockX - 1, a_BlockZ));
+	AddBlock(a_BlockX + 1, a_BlockY,     a_BlockZ,     a_Chunk->GetNeighborChunk(a_BlockX + 1, a_BlockZ));
+	AddBlock(a_BlockX,     a_BlockY,     a_BlockZ - 1, a_Chunk->GetNeighborChunk(a_BlockX,     a_BlockZ - 1));
+	AddBlock(a_BlockX,     a_BlockY,     a_BlockZ + 1, a_Chunk->GetNeighborChunk(a_BlockX,     a_BlockZ + 1));
+	if (a_BlockY > 0)
+	{
+		AddBlock(a_BlockX,   a_BlockY - 1, a_BlockZ,     a_Chunk);
+	}
+	if (a_BlockY < cChunkDef::Height - 1)
+	{
+		AddBlock(a_BlockX,   a_BlockY + 1, a_BlockZ,     a_Chunk);
+	}
+}
+
+
+
+
diff --git a/src/Simulator/Simulator.h b/src/Simulator/Simulator.h
new file mode 100644
index 000000000..5cd0e8657
--- /dev/null
+++ b/src/Simulator/Simulator.h
@@ -0,0 +1,46 @@
+
+#pragma once
+
+#include "../Vector3i.h"
+#include "inifile/iniFile.h"
+
+
+
+
+
+class cWorld;
+class cChunk;
+
+
+
+
+
+class cSimulator
+{
+public:
+	cSimulator(cWorld & a_World);
+	virtual ~cSimulator();
+
+	/// Called in each tick, a_Dt is the time passed since the last tick, in msec
+	virtual void Simulate(float a_Dt) = 0;
+	
+	/// Called in each tick for each chunk, a_Dt is the time passed since the last tick, in msec; direct access to chunk data available
+	virtual void SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk) {};
+	
+	/// Called when a block changes
+	virtual void WakeUp(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk);
+
+	virtual bool IsAllowedBlock(BLOCKTYPE a_BlockType) = 0;
+
+protected:
+	friend class cChunk;  // Calls AddBlock() in its WakeUpSimulators() function, to speed things up
+	
+	/// Called to simulate a new block
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) = 0;
+
+	cWorld & m_World;
+} ;
+
+
+
+
diff --git a/src/Simulator/SimulatorManager.cpp b/src/Simulator/SimulatorManager.cpp
new file mode 100644
index 000000000..2bc483cbd
--- /dev/null
+++ b/src/Simulator/SimulatorManager.cpp
@@ -0,0 +1,80 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "SimulatorManager.h"
+#include "../World.h"
+
+
+
+
+
+cSimulatorManager::cSimulatorManager(cWorld & a_World) :
+	m_World(a_World),
+	m_Ticks(0)
+{
+}
+
+
+
+
+
+cSimulatorManager::~cSimulatorManager()
+{
+}
+
+
+
+
+
+void cSimulatorManager::Simulate(float a_Dt)
+{
+	m_Ticks++;
+	for (cSimulators::iterator itr = m_Simulators.begin(); itr != m_Simulators.end(); ++itr )
+	{
+		if ((m_Ticks % itr->second) == 0)
+		{
+			itr->first->Simulate(a_Dt);
+		}
+	}
+}
+
+
+
+
+
+void cSimulatorManager::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{
+	// m_Ticks has already been increased in Simulate()
+	for (cSimulators::iterator itr = m_Simulators.begin(); itr != m_Simulators.end(); ++itr )
+	{
+		if ((m_Ticks % itr->second) == 0)
+		{
+			itr->first->SimulateChunk(a_Dt, a_ChunkX, a_ChunkZ, a_Chunk);
+		}
+	}
+}
+
+
+
+
+
+void cSimulatorManager::WakeUp(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	for (cSimulators::iterator itr = m_Simulators.begin(); itr != m_Simulators.end(); ++itr )
+	{
+		itr->first->WakeUp(a_BlockX, a_BlockY, a_BlockZ, a_Chunk);
+	}
+}
+
+
+
+
+
+void cSimulatorManager::RegisterSimulator(cSimulator * a_Simulator, int a_Rate)
+{
+	m_Simulators.push_back(std::make_pair(a_Simulator, a_Rate));
+}
+
+
+
+
diff --git a/src/Simulator/SimulatorManager.h b/src/Simulator/SimulatorManager.h
new file mode 100644
index 000000000..31a709316
--- /dev/null
+++ b/src/Simulator/SimulatorManager.h
@@ -0,0 +1,52 @@
+
+// cSimulatorManager.h
+
+
+
+
+#pragma once
+
+
+
+
+#include "Simulator.h"
+
+
+
+
+
+// fwd: Chunk.h
+class cChunk;
+
+// fwd: World.h
+class cWorld;
+
+
+
+
+
+class cSimulatorManager
+{
+public:
+	cSimulatorManager(cWorld & a_World);
+	~cSimulatorManager();
+
+	void Simulate(float a_Dt);
+	
+	void SimulateChunk(float a_DT, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk);
+	
+	void WakeUp(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk);
+
+	void RegisterSimulator(cSimulator * a_Simulator, int a_Rate);  // Takes ownership of the simulator object!
+
+protected:
+	typedef std::vector <std::pair<cSimulator *, int> > cSimulators;
+	
+	cWorld & m_World;
+	cSimulators m_Simulators;
+	long long   m_Ticks;
+};
+
+
+
+
diff --git a/src/Simulator/VaporizeFluidSimulator.cpp b/src/Simulator/VaporizeFluidSimulator.cpp
new file mode 100644
index 000000000..4206c64d1
--- /dev/null
+++ b/src/Simulator/VaporizeFluidSimulator.cpp
@@ -0,0 +1,53 @@
+
+// VaporizeFluidSimulator.cpp
+
+// Implements the cVaporizeFluidSimulator class representing a fluid simulator that replaces all fluid blocks with air
+
+#include "Globals.h"
+#include "VaporizeFluidSimulator.h"
+#include "../Chunk.h"
+
+
+
+
+
+cVaporizeFluidSimulator::cVaporizeFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid) :
+	super(a_World, a_Fluid, a_StationaryFluid)
+{
+}
+
+
+
+
+
+void cVaporizeFluidSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if (a_Chunk == NULL)
+	{
+		return;
+	}
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;	
+	BLOCKTYPE BlockType = a_Chunk->GetBlock(RelX, a_BlockY, RelZ);
+	if (
+		(BlockType == m_FluidBlock) ||
+		(BlockType == m_StationaryFluidBlock)
+	)
+	{
+		a_Chunk->SetBlock(RelX, a_BlockY, RelZ, E_BLOCK_AIR, 0);
+		a_Chunk->BroadcastSoundEffect("random.fizz", a_BlockX * 8, a_BlockY * 8, a_BlockZ * 8, 1.0f, 0.6f);
+	}
+}
+
+
+
+
+
+void cVaporizeFluidSimulator::Simulate(float a_Dt)
+{
+	// Nothing needed
+}
+
+
+
+
diff --git a/src/Simulator/VaporizeFluidSimulator.h b/src/Simulator/VaporizeFluidSimulator.h
new file mode 100644
index 000000000..c8eb7802b
--- /dev/null
+++ b/src/Simulator/VaporizeFluidSimulator.h
@@ -0,0 +1,34 @@
+
+// VaporizeFluidSimulator.h
+
+// Declares the cVaporizeFluidSimulator class representing a fluid simulator that replaces all fluid blocks with air
+// Useful for water simulation in the Nether
+
+
+
+
+
+#pragma once
+
+#include "FluidSimulator.h"
+
+
+
+
+
+class cVaporizeFluidSimulator :
+	public cFluidSimulator
+{
+	typedef cFluidSimulator super;
+	
+public:
+	cVaporizeFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid);
+
+	// cSimulator overrides:
+	virtual void AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk) override;
+	virtual void Simulate(float a_Dt) override;
+} ;
+
+
+
+