28 files changed, 1329 insertions, 227 deletions

diff --git a/source/BlockID.cpp b/source/BlockID.cpp
index 177652a46..2fe495c6f 100644
--- a/source/BlockID.cpp
+++ b/source/BlockID.cpp
@@ -662,6 +662,7 @@ public:
 		g_BlockTransparent[E_BLOCK_GLASS_PANE]            = true;
 		g_BlockTransparent[E_BLOCK_ICE]                   = true;
 		g_BlockTransparent[E_BLOCK_IRON_DOOR]             = true;
+		g_BlockTransparent[E_BLOCK_LAVA]                  = true;
 		g_BlockTransparent[E_BLOCK_LEAVES]                = true;
 		g_BlockTransparent[E_BLOCK_LEVER]                 = true;
 		g_BlockTransparent[E_BLOCK_MELON_STEM]            = true;
@@ -674,11 +675,14 @@ public:
 		g_BlockTransparent[E_BLOCK_RED_MUSHROOM]          = true;
 		g_BlockTransparent[E_BLOCK_RED_ROSE]              = true;
 		g_BlockTransparent[E_BLOCK_SIGN_POST]             = true;
+		g_BlockTransparent[E_BLOCK_STATIONARY_LAVA]       = true;
+		g_BlockTransparent[E_BLOCK_STATIONARY_WATER]      = true;
 		g_BlockTransparent[E_BLOCK_STONE_PRESSURE_PLATE]  = true;
 		g_BlockTransparent[E_BLOCK_SNOW]                  = true;
 		g_BlockTransparent[E_BLOCK_TALL_GRASS]            = true;
 		g_BlockTransparent[E_BLOCK_TORCH]                 = true;
 		g_BlockTransparent[E_BLOCK_VINES]                 = true;
+		g_BlockTransparent[E_BLOCK_WATER]                 = true;
 		g_BlockTransparent[E_BLOCK_WALLSIGN]              = true;
 		g_BlockTransparent[E_BLOCK_WOODEN_DOOR]           = true;
 		g_BlockTransparent[E_BLOCK_WOODEN_PRESSURE_PLATE] = true;
diff --git a/source/Chunk.cpp b/source/Chunk.cpp
index db533f642..21401163b 100644
--- a/source/Chunk.cpp
+++ b/source/Chunk.cpp
@@ -30,6 +30,9 @@
 #include "PluginManager.h"
 #include "Blocks/BlockHandler.h"
 #include "Simulator/FluidSimulator.h"
+#include "MobCensus.h"
+#include "MobSpawner.h"
+
 
 #include <json/json.h>
 
@@ -429,6 +432,133 @@ void cChunk::Stay(bool a_Stay)
 
 
 
+void cChunk::CollectMobCensus(cMobCensus& toFill)
+{
+	toFill.CollectSpawnableChunk(*this);
+	std::list<const Vector3d*> playerPositions;
+	cPlayer* currentPlayer;
+	for (cClientHandleList::iterator itr = m_LoadedByClient.begin(), end = m_LoadedByClient.end(); itr != end; ++itr)
+	{
+		currentPlayer = (*itr)->GetPlayer();
+		playerPositions.push_back(&(currentPlayer->GetPosition()));
+	} 
+
+	Vector3d currentPosition;
+	for (cEntityList::iterator itr = m_Entities.begin(); itr != m_Entities.end(); ++itr)
+	{
+		//LOGD("Counting entity #%i (%s)", (*itr)->GetUniqueID(), (*itr)->GetClass());
+		if ((*itr)->IsMob())
+		{
+			cMonster& Monster = (cMonster&)(**itr);
+			currentPosition = Monster.GetPosition();
+			for (std::list<const Vector3d*>::const_iterator itr2 = playerPositions.begin(); itr2 != playerPositions.end(); itr2 ++)
+			{
+				toFill.CollectMob(Monster,*this,(currentPosition-**itr2).SqrLength());
+			}
+		}
+	}  // for itr - m_Entitites[]
+}
+
+
+
+
+void cChunk::getThreeRandomNumber(int& a_X, int& a_Y, int& a_Z,int a_MaxX, int a_MaxY, int a_MaxZ)
+{
+	ASSERT(a_MaxX * a_MaxY * a_MaxZ * 8 < 0x00ffffff);
+	int Random = m_World->GetTickRandomNumber(0x00ffffff);
+	a_X =   Random % (a_MaxX * 2);
+	a_Y =  (Random / (a_MaxX * 2)) % (a_MaxY * 2);
+	a_Z = ((Random / (a_MaxX * 2)) / (a_MaxY * 2)) % (a_MaxZ * 2);
+	a_X /= 2;
+	a_Y /= 2;
+	a_Z /= 2;
+}
+
+
+
+
+
+void cChunk::getRandomBlockCoords(int& a_X, int& a_Y, int& a_Z)
+{
+	// MG TODO : check if this kind of optimization (only one random call) is still needed
+	// MG TODO : if so propagate it
+
+	getThreeRandomNumber(a_X, a_Y, a_Z, Width, Height-2, Width);
+	a_Y++;
+}
+
+
+
+
+
+void cChunk::SpawnMobs(cMobSpawner& a_MobSpawner)
+{
+	int Center_X,Center_Y,Center_Z;
+	getRandomBlockCoords(Center_X,Center_Y,Center_Z);
+
+	BLOCKTYPE PackCenterBlock = GetBlock(Center_X, Center_Y, Center_Z);
+	if (a_MobSpawner.CheckPackCenter(PackCenterBlock))
+	{
+		a_MobSpawner.NewPack();
+		int NumberOfTries = 0;
+		int NumberOfSuccess = 0;
+		int MaxNbOfSuccess = 4; // this can be changed during the process for Wolves and Ghass
+		while (NumberOfTries < 12 && NumberOfSuccess < MaxNbOfSuccess)
+		{
+			const int HorizontalRange = 20; // MG TODO : relocate
+			const int VerticalRange = 0; // MG TODO : relocate
+			int Try_X, Try_Y, Try_Z;
+			getThreeRandomNumber(Try_X, Try_Y, Try_Z, 2*HorizontalRange+1 , 2*VerticalRange+1 , 2*HorizontalRange+1);
+			Try_X -= HorizontalRange;
+			Try_Y -= VerticalRange;
+			Try_Z -= HorizontalRange;
+			Try_X += Center_X;
+			Try_Y += Center_Y;
+			Try_Z += Center_Z;
+
+			ASSERT(Try_Y > 0);
+			ASSERT(Try_Y < cChunkDef::Height-1);
+			
+			BLOCKTYPE BlockType;
+			NIBBLETYPE BlockMeta;
+			BLOCKTYPE BlockType_below;
+			NIBBLETYPE BlockMeta_below;
+			BLOCKTYPE BlockType_above;
+			NIBBLETYPE BlockMeta_above;
+			if (UnboundedRelGetBlock(Try_X, Try_Y  , Try_Z, BlockType, BlockMeta) &&
+				UnboundedRelGetBlock(Try_X, Try_Y-1, Try_Z, BlockType_below, BlockMeta_below)&&
+				UnboundedRelGetBlock(Try_X, Try_Y+1, Try_Z, BlockType_above, BlockMeta_above)
+				)
+			{
+				EMCSBiome Biome = m_ChunkMap->GetBiomeAt (Try_X, Try_Z);
+				// MG TODO :
+				// Moon cycle (for slime)
+				// check player and playerspawn presence < 24 blocks
+				// check mobs presence on the block
+
+				// MG TODO: fix the "light" thing, I'm pretty sure that UnboundedRelGetBlock s not returning the right thing
+
+				// MG TODO : check that "Level" really means Y
+				cEntity* newMob = a_MobSpawner.TryToSpawnHere(BlockType, BlockMeta, BlockType_below, BlockMeta_below, BlockType_above, BlockMeta_above, Biome, Try_Y, MaxNbOfSuccess);
+				if (newMob)
+				{
+					int WorldX, WorldY, WorldZ;
+					PositionToWorldPosition(Try_X, Try_Y, Try_Z, WorldX, WorldY, WorldZ);
+					newMob->SetPosition(WorldX, WorldY, WorldZ);
+					LOGD("Spawning %s #%i at %d,%d,%d",newMob->GetClass(),newMob->GetUniqueID(),WorldX, WorldY, WorldZ);
+					NumberOfSuccess++;
+				}
+			}
+			
+			NumberOfTries++;
+		}
+	}
+
+}
+
+
+
+
 
 void cChunk::Tick(float a_Dt)
 {
@@ -457,10 +587,14 @@ void cChunk::Tick(float a_Dt)
 		m_IsDirty = (*itr)->Tick(a_Dt, *this) | m_IsDirty;
 	}
 	
-	// Tick all entities in this chunk:
+	// Tick all entities in this chunk (except mobs):
 	for (cEntityList::iterator itr = m_Entities.begin(); itr != m_Entities.end(); ++itr)
 	{
-		(*itr)->Tick(a_Dt, *this);
+		// Mobs are tickes inside MobTick (as we don't have to tick them if they are far away from players)
+		if (!((*itr)->IsMob()))
+		{
+			(*itr)->Tick(a_Dt, *this);
+		}
 	}  // for itr - m_Entitites[]
 	
 	// Remove all entities that were scheduled for removal:
diff --git a/source/Chunk.h b/source/Chunk.h
index c979b7928..aca180d16 100644
--- a/source/Chunk.h
+++ b/source/Chunk.h
@@ -49,6 +49,8 @@ class cPickup;
 class cChunkDataSerializer;
 class cBlockArea;
 class cFluidSimulatorData;
+class cMobCensus;
+class cMobSpawner;
 
 typedef std::list<cClientHandle *>      cClientHandleList;
 typedef cItemCallback<cEntity>          cEntityCallback;
@@ -124,6 +126,12 @@ public:
 	/// Sets or resets the internal flag that prevents chunk from being unloaded
 	void Stay(bool a_Stay = true);
 	
+	/// Recence all mobs proximities to players in order to know what to do with them
+	void CollectMobCensus(cMobCensus& toFill);
+
+	/// Try to Spawn Monsters inside chunk
+	void SpawnMobs(cMobSpawner& a_MobSpawner);
+
 	void Tick(float a_Dt);
 
 	int GetPosX(void) const { return m_PosX; }
@@ -385,6 +393,10 @@ private:
 	cSandSimulatorChunkData m_SandSimulatorData;
 
 
+	// pick up a random block of this chunk
+	void getRandomBlockCoords(int& a_X, int& a_Y, int& a_Z);
+	void getThreeRandomNumber(int& a_X, int& a_Y, int& a_Z,int a_MaxX, int a_MaxY, int a_MaxZ);
+
 	void RemoveBlockEntity(cBlockEntity * a_BlockEntity);
 	void AddBlockEntity   (cBlockEntity * a_BlockEntity);
 
diff --git a/source/ChunkMap.cpp b/source/ChunkMap.cpp
index 3c098fdfe..c3bd5f33d 100644
--- a/source/ChunkMap.cpp
+++ b/source/ChunkMap.cpp
@@ -12,6 +12,8 @@
 #include "BlockArea.h"
 #include "PluginManager.h"
 #include "Entities/TNTEntity.h"
+#include "MobCensus.h"
+#include "MobSpawner.h"
 
 #ifndef _WIN32
 	#include <cstdlib> // abs
@@ -2152,6 +2154,32 @@ void cChunkMap::SetNextBlockTick(int a_BlockX, int a_BlockY, int a_BlockZ)
 
 
 
+void cChunkMap::CollectMobCensus(cMobCensus& a_ToFill)
+{
+	cCSLock Lock(m_CSLayers);
+	for (cChunkLayerList::iterator itr = m_Layers.begin(); itr != m_Layers.end(); ++itr)
+	{
+		(*itr)->CollectMobCensus(a_ToFill);
+	}  // for itr - m_Layers
+}
+
+
+
+
+
+
+void cChunkMap::SpawnMobs(cMobSpawner& a_MobSpawner)
+{
+	cCSLock Lock(m_CSLayers);
+	for (cChunkLayerList::iterator itr = m_Layers.begin(); itr != m_Layers.end(); ++itr)
+	{
+		(*itr)->SpawnMobs(a_MobSpawner);
+	}  // for itr - m_Layers
+}
+
+
+
+
 
 void cChunkMap::Tick(float a_Dt)
 {
@@ -2310,6 +2338,38 @@ cChunk * cChunkMap::cChunkLayer::FindChunk(int a_ChunkX, int a_ChunkZ)
 
 
 
+void cChunkMap::cChunkLayer::CollectMobCensus(cMobCensus& a_ToFill)
+{
+	for (int i = 0; i < ARRAYCOUNT(m_Chunks); i++)
+	{
+		// We do count every Mobs in the world. But we are assuming that every chunk not loaded by any client
+		// doesn't affect us. Normally they should not have mobs because every "too far" mobs despawn
+		// If they have (f.i. when player disconnect) we assume we don't have to make them live or despawn
+		if ((m_Chunks[i] != NULL) && m_Chunks[i]->IsValid() && m_Chunks[i]->HasAnyClients())
+		{
+			m_Chunks[i]->CollectMobCensus(a_ToFill);
+		}
+	}  // for i - m_Chunks[]
+}
+
+
+
+
+
+
+void cChunkMap::cChunkLayer::SpawnMobs(cMobSpawner& a_MobSpawner)
+{
+	for (int i = 0; i < ARRAYCOUNT(m_Chunks); i++)
+	{
+		// We only spawn close to players
+		if ((m_Chunks[i] != NULL) && m_Chunks[i]->IsValid() && m_Chunks[i]->HasAnyClients())
+		{
+			m_Chunks[i]->SpawnMobs(a_MobSpawner);
+		}
+	}  // for i - m_Chunks[]
+}
+
+
 
 void cChunkMap::cChunkLayer::Tick(float a_Dt)
 {
diff --git a/source/ChunkMap.h b/source/ChunkMap.h
index fcb164f7b..f68cb6472 100644
--- a/source/ChunkMap.h
+++ b/source/ChunkMap.h
@@ -26,6 +26,8 @@ class cPawn;
 class cPickup;
 class cChunkDataSerializer;
 class cBlockArea;
+class cMobCensus;
+class cMobSpawner;
 
 typedef std::list<cClientHandle *>  cClientHandleList;
 typedef cChunk * cChunkPtr;
@@ -263,9 +265,15 @@ public:
 	/// Grows a cactus present at the block specified by the amount of blocks specified, up to the max height specified in the config
 	void GrowCactus(int a_BlockX, int a_BlockY, int a_BlockZ, int a_NumBlocksToGrow);
 	
-		/// Sets the blockticking to start at the specified block. Only one blocktick per chunk may be set, second call overwrites the first call
+	/// Sets the blockticking to start at the specified block. Only one blocktick per chunk may be set, second call overwrites the first call
 	void SetNextBlockTick(int a_BlockX, int a_BlockY, int a_BlockZ);
 
+	/// Make a Mob census, of all mobs, their family, their chunk and theyr distance to closest player
+	void CollectMobCensus(cMobCensus& a_ToFill);
+
+	/// Try to Spawn Monsters inside all Chunks
+	void SpawnMobs(cMobSpawner& a_MobSpawner);
+
 	void Tick(float a_Dt);
 
 	void UnloadUnusedChunks(void);
@@ -309,6 +317,11 @@ private:
 		void Save(void);
 		void UnloadUnusedChunks(void);
 		
+		/// Collect a mob census, of all mobs, their megatype, their chunk and their distance o closest player
+		void CollectMobCensus(cMobCensus& a_ToFill);		
+		/// Try to Spawn Monsters inside all Chunks
+		void SpawnMobs(cMobSpawner& a_MobSpawner);
+
 		void Tick(float a_Dt);
 		
 		void RemoveClient(cClientHandle * a_Client);
diff --git a/source/MobCensus.cpp b/source/MobCensus.cpp
new file mode 100644
index 000000000..612f25916
--- /dev/null
+++ b/source/MobCensus.cpp
@@ -0,0 +1,89 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "MobCensus.h"
+
+
+
+cMobCensus::tCapMultipliersMap cMobCensus::CapMultiplierInitializerBeforeCx11()
+{
+	std::map<cMonster::eFamily,int> toReturn;
+	toReturn[cMonster::mfHostile] = 79;
+	toReturn[cMonster::mfPassive] = 11;
+	toReturn[cMonster::mfAmbient] = 16;
+	toReturn[cMonster::mfWater] = 5;
+	return toReturn;
+}
+
+cMobCensus::tMobSpawnRate cMobCensus::MobSpawnRateInitializerBeforeCx11()
+{
+	std::map<cMonster::eFamily,int> toReturn;
+	toReturn[cMonster::mfHostile] = 1;
+	toReturn[cMonster::mfPassive] = 400;
+	toReturn[cMonster::mfAmbient] = 400;
+	toReturn[cMonster::mfWater] = 400;
+	return toReturn;
+}
+
+cMobCensus::tCapMultipliersMap& cMobCensus::m_CapMultipliers()
+{
+	static tCapMultipliersMap* value = new tCapMultipliersMap(CapMultiplierInitializerBeforeCx11());
+	return *value;
+}
+
+cMobCensus::tMobSpawnRate& cMobCensus::m_SpawnRate()
+{
+	static tMobSpawnRate* value = new tMobSpawnRate(MobSpawnRateInitializerBeforeCx11());
+	return *value;
+}
+
+cMobCensus::cMobCensus()
+{
+}	
+
+void cMobCensus::CollectMob(cMonster& a_Monster, cChunk& a_Chunk, double a_Distance)
+{
+	m_ProximityCounter.CollectMob(a_Monster,a_Chunk,a_Distance);
+	m_MobFamilyCollecter.CollectMob(a_Monster);
+}
+
+bool cMobCensus::isCaped(cMonster::eFamily a_MobFamily)
+{
+	bool toReturn = true;
+	const int ratio = 319; // this should be 256 as we are only supposed to take account from chunks that are in 17x17 from a player
+	// but for now, we use all chunks loaded by players. that means 19 x 19 chucks. That's why we use 256 * (19*19) / (17*17) = 319
+	// MG TODO : code the correct count	
+	tCapMultipliersMap::const_iterator capMultiplier = m_CapMultipliers().find(a_MobFamily);
+	if	(
+		(capMultiplier != m_CapMultipliers().end()) &&
+		(capMultiplier->second * getChunkNb()) / ratio >= m_MobFamilyCollecter.getNumberOfCollectedMobs(a_MobFamily)
+		)
+	{
+		toReturn = false;
+	}
+	return toReturn;
+}
+
+void cMobCensus::CollectSpawnableChunk(cChunk& a_Chunk)
+{
+	m_EligibleForSpawnChunks.insert(&a_Chunk);
+}
+
+int cMobCensus::getChunkNb()
+{
+	return m_EligibleForSpawnChunks.size();
+}
+
+cMobProximityCounter& cMobCensus::getProximityCounter()
+{
+	return m_ProximityCounter;
+}
+
+
+void cMobCensus::logd()
+{
+	LOGD((std::string("Hostile mobs : %d") + (isCaped(cMonster::mfHostile)?"(capped)":"")).c_str(),m_MobFamilyCollecter.getNumberOfCollectedMobs(cMonster::mfHostile));
+	LOGD((std::string("Ambiant mobs : %d") + (isCaped(cMonster::mfAmbient)?"(capped)":"")).c_str(),m_MobFamilyCollecter.getNumberOfCollectedMobs(cMonster::mfAmbient));
+	LOGD((std::string("Water mobs   : %d") + (isCaped(cMonster::mfWater)?  "(capped)":"")).c_str(),m_MobFamilyCollecter.getNumberOfCollectedMobs(cMonster::mfWater));
+	LOGD((std::string("Passive mobs : %d") + (isCaped(cMonster::mfPassive)?"(capped)":"")).c_str(),m_MobFamilyCollecter.getNumberOfCollectedMobs(cMonster::mfPassive));
+}
diff --git a/source/MobCensus.h b/source/MobCensus.h
new file mode 100644
index 000000000..8aa8f3a6c
--- /dev/null
+++ b/source/MobCensus.h
@@ -0,0 +1,58 @@
+
+#pragma once
+
+#include "MobProximityCounter.h"
+#include "MobFamilyCollecter.h"
+
+class cChunk;
+class cMonster;
+
+// This class is used to collect, for each Mob, what is the distance of the closest player
+// it was first being designed in order to make mobs spawn / despawn / act
+// as the behaviour and even life of mobs depends on the distance to closest player
+//
+// as side effect : it also collect the chunks that are elligible for spawning
+// as side effect 2 : it also know the caps for mobs number and can compare census to this numbers
+class cMobCensus
+{
+public :
+	cMobCensus();
+
+protected :
+	cMobProximityCounter m_ProximityCounter;
+	cMobFamilyCollecter m_MobFamilyCollecter;
+
+	typedef const std::map<cMonster::eFamily,int> tCapMultipliersMap;
+	static tCapMultipliersMap& m_CapMultipliers();
+
+	std::set<cChunk*> m_EligibleForSpawnChunks;
+
+	// count the chunks that are elligible to spawn (for now, the loaded valide not null chunks)
+	int getChunkNb();
+
+public:
+	typedef const std::map<cMonster::eFamily,int> tMobSpawnRate;
+	static tMobSpawnRate& m_SpawnRate();
+
+	// return the nested proximity counter
+	cMobProximityCounter& getProximityCounter();
+
+public :
+	// collect an elligible Chunk for Mob Spawning
+	// MG TODO : code the correct rule (not loaded chunk but short distant from players)
+	void CollectSpawnableChunk(cChunk& a_Chunk);
+	
+	// collect a mob - it's distance to player, it's family ...
+	void CollectMob(cMonster& a_Monster, cChunk& a_Chunk, double a_Distance);
+
+	// return true if the family is caped (i.e. there is more mobs of this family than max)
+	bool isCaped(cMonster::eFamily a_MobFamily);
+
+	// log the results of census
+	void logd();
+
+protected : 
+	static tCapMultipliersMap CapMultiplierInitializerBeforeCx11();
+	static tCapMultipliersMap MobSpawnRateInitializerBeforeCx11();
+};
+
diff --git a/source/MobFamilyCollecter.cpp b/source/MobFamilyCollecter.cpp
new file mode 100644
index 000000000..2aa46599a
--- /dev/null
+++ b/source/MobFamilyCollecter.cpp
@@ -0,0 +1,33 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "MobFamilyCollecter.h"
+#include "Mobs/Monster.h"
+
+
+
+cMobFamilyCollecter::tMobFamilyList cMobFamilyCollecter::initMobFamilyBeforeCx11()
+{
+	std::set<cMonster::eFamily> toReturn;
+	toReturn.insert(cMonster::mfHostile);
+	toReturn.insert(cMonster::mfPassive);
+	toReturn.insert(cMonster::mfAmbient);
+	toReturn.insert(cMonster::mfWater);
+	return toReturn;
+}
+cMobFamilyCollecter::tMobFamilyList& cMobFamilyCollecter::m_AllFamilies()
+{
+	static tMobFamilyList* AllFamilies = new tMobFamilyList(initMobFamilyBeforeCx11());
+	return *AllFamilies;
+}
+
+void cMobFamilyCollecter::CollectMob(cMonster& a_Monster)
+{
+	cMonster::eFamily MobFamily = a_Monster.GetMobFamily();
+	m_Mobs[MobFamily].insert(&a_Monster);
+}
+
+int cMobFamilyCollecter::getNumberOfCollectedMobs(cMonster::eFamily a_Family)
+{
+	return m_Mobs[a_Family].size();
+}
diff --git a/source/MobFamilyCollecter.h b/source/MobFamilyCollecter.h
new file mode 100644
index 000000000..659d2b687
--- /dev/null
+++ b/source/MobFamilyCollecter.h
@@ -0,0 +1,40 @@
+
+#pragma once
+
+#include <map>
+#include <set>
+#include "BlockID.h"
+#include "Mobs/Monster.h" //this is a side-effect of keeping Mobfamily inside Monster class. I'd prefer to keep both (Mobfamily and Monster) inside a "Monster" namespace MG TODO : do it
+
+class cChunk;
+
+
+// This class is used to collect, for each Mob, what is it's family. It was first
+// being designed to check the caps of the mobs (no more than ... hostile mob in the world)
+//
+// as side effects : it also know what is the spawnrate of each family : MG TODO relocate
+class cMobFamilyCollecter
+{
+protected :
+	std::map<cMonster::eFamily,std::set<cMonster*> > m_Mobs;
+
+public :
+	// collect a mob
+	void CollectMob(cMonster& a_Monster);
+
+	// return the number of mobs for this family
+	int getNumberOfCollectedMobs(cMonster::eFamily a_Family);
+
+public :
+	typedef const std::set<cMonster::eFamily> tMobFamilyList;
+	static tMobFamilyList& m_AllFamilies();
+
+public : 
+	typedef const std::map<cMonster::eFamily,int> tMobSpawRate;
+	static tMobSpawRate& m_SpawnRate();
+
+protected : 
+	static tMobFamilyList initMobFamilyBeforeCx11();
+	static tMobSpawRate initMobSpawnRateBeforeCx11();
+};
+
diff --git a/source/MobProximityCounter.cpp b/source/MobProximityCounter.cpp
new file mode 100644
index 000000000..583a71579
--- /dev/null
+++ b/source/MobProximityCounter.cpp
@@ -0,0 +1,83 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "MobProximityCounter.h"
+
+#include "Entities/Entity.h"
+#include "Chunk.h"
+
+void cMobProximityCounter::CollectMob(cEntity& a_Monster, cChunk& a_Chunk, double a_Distance)
+{
+//	LOGD("Collecting monster %s, with distance %f",a_Monster->GetClass(),a_Distance);
+	tMonsterToDistance::iterator it = m_MonsterToDistance.find(&a_Monster);
+	if (it == m_MonsterToDistance.end())
+	{
+		sDistanceAndChunk newDistanceAndChunk(a_Distance,a_Chunk);
+		std::pair<tMonsterToDistance::iterator,bool> result = m_MonsterToDistance.insert(tMonsterToDistance::value_type(&a_Monster,newDistanceAndChunk));
+		if (!result.second)
+		{
+			ASSERT(!"A collected Monster was not found inside distance map using find(), but insert() said there already is a key for it");
+		}
+	}
+	else
+	{
+		if (a_Distance < it->second.m_Distance)
+		{
+			it->second.m_Distance = a_Distance;
+			it->second.m_Chunk = a_Chunk;
+		}
+	}
+
+	m_EligibleForSpawnChunks.insert(&a_Chunk);
+
+}
+
+void cMobProximityCounter::convertMaps()
+{
+	for(tMonsterToDistance::const_iterator itr = m_MonsterToDistance.begin(); itr != m_MonsterToDistance.end(); itr++)
+	{
+		m_DistanceToMonster.insert(tDistanceToMonster::value_type(itr->second.m_Distance,sMonsterAndChunk(*itr->first,itr->second.m_Chunk)));
+	}
+}
+
+cMobProximityCounter::sIterablePair cMobProximityCounter::getMobWithinThosesDistances(double a_DistanceMin, double a_DistanceMax)
+{
+	sIterablePair toReturn;
+	toReturn.m_Count = 0;
+	toReturn.m_Begin = m_DistanceToMonster.end();
+	toReturn.m_End = m_DistanceToMonster.end();
+
+	a_DistanceMin *= a_DistanceMin;// this is because is use square distance
+	a_DistanceMax *= a_DistanceMax;
+
+	if (m_DistanceToMonster.size() <= 0)
+	{
+		convertMaps();
+	}
+
+	for(tDistanceToMonster::const_iterator itr = m_DistanceToMonster.begin(); itr != m_DistanceToMonster.end(); itr++)
+	{
+		if (toReturn.m_Begin == m_DistanceToMonster.end())
+		{
+			if (a_DistanceMin == -1 || itr->first > a_DistanceMin)
+			{
+				toReturn.m_Begin = itr; // this is the first one with distance > a_DistanceMin;
+			}
+		}
+
+		if (toReturn.m_Begin != m_DistanceToMonster.end())
+		{
+			if (a_DistanceMax != -1 && itr->first > a_DistanceMax)
+			{
+				toReturn.m_End = itr; // this is just after the last one with distance < a_DistanceMax
+				// Note : if we are not going through this, it's ok, toReturn.m_End will be end();
+				break;
+			}
+			else
+			{
+				toReturn.m_Count ++;
+			}
+		}
+	}
+	return toReturn;
+}
diff --git a/source/MobProximityCounter.h b/source/MobProximityCounter.h
new file mode 100644
index 000000000..8a67139aa
--- /dev/null
+++ b/source/MobProximityCounter.h
@@ -0,0 +1,65 @@
+
+#pragma once
+
+#include <set>
+
+class cChunk;
+class cEntity;
+
+
+// This class is used to collect, for each Mob, what is the distance of the closest player
+// it was first being designed in order to make mobs spawn / despawn / act
+// as the behaviour and even life of mobs depends on the distance to closest player
+class cMobProximityCounter
+{
+protected :
+	// structs used for later maps (see m_MonsterToDistance and m_DistanceToMonster)
+	struct sDistanceAndChunk
+	{
+		sDistanceAndChunk(double a_Distance, cChunk& a_Chunk) : m_Distance(a_Distance), m_Chunk(a_Chunk) {}
+		double m_Distance;
+		cChunk& m_Chunk;
+	};
+	struct sMonsterAndChunk
+	{
+		sMonsterAndChunk(cEntity& a_Monster, cChunk& a_Chunk) : m_Monster(a_Monster), m_Chunk(a_Chunk) {}
+		cEntity& m_Monster;
+		cChunk& m_Chunk;
+	};
+
+public : 
+	typedef std::map<cEntity*,sDistanceAndChunk> tMonsterToDistance;
+	typedef std::multimap<double,sMonsterAndChunk> tDistanceToMonster;
+
+protected : 
+	// this map is filled during collection phase, it will be later transformed into DistanceToMonster
+	tMonsterToDistance m_MonsterToDistance;
+
+	// this map is generated after collection phase, in order to access monster by distance to player
+	tDistanceToMonster m_DistanceToMonster;
+
+	// this are the collected chunks. Used to determinate the number of elligible chunk for spawning.
+	std::set<cChunk*> m_EligibleForSpawnChunks;
+
+protected : 
+	// transform monsterToDistance map (that was usefull for collecting) into distanceToMonster
+	// that will be usefull for picking up.
+	void convertMaps();
+
+public :
+	// count a mob on a specified chunk with specified distance to an unkown player
+	// if the distance is shortest than the one collected, this become the new closest
+	// distance and the chunk become the "hosting" chunk (that is the one that will perform the action)
+	void CollectMob(cEntity& a_Monster, cChunk& a_Chunk, double a_Distance);
+
+	// return the mobs that are within the range of distance of the closest player they are
+	// that means that if a mob is 30 m from a player and 150 m from another one. It will be
+	// in the range [0..50] but not in [100..200]
+	struct sIterablePair{
+		tDistanceToMonster::const_iterator m_Begin;
+		tDistanceToMonster::const_iterator m_End;
+		int m_Count;
+	};
+	sIterablePair getMobWithinThosesDistances(double a_DistanceMin, double a_DistanceMax);
+
+};
diff --git a/source/MobSpawner.cpp b/source/MobSpawner.cpp
new file mode 100644
index 000000000..9bff87533
--- /dev/null
+++ b/source/MobSpawner.cpp
@@ -0,0 +1,275 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "MobSpawner.h"
+#include "MobTypesManager.h"
+#include "Mobs/Monster.h"
+#include "Mobs/IncludeAllMonsters.h"
+
+cMobSpawner::tMobTypes& cMobSpawner::m_MobTypes()
+{
+	static tMobTypes* value = new tMobTypes(initMobTypesBeforeCx11());
+	return *value;
+}
+
+cMobSpawner::tMobTypes cMobSpawner::initMobTypesBeforeCx11()
+{
+	std::set<cMonster::eType> toReturn;
+	toReturn.insert(cMonster::mtCreeper);
+	toReturn.insert(cMonster::mtSkeleton);
+	toReturn.insert(cMonster::mtSpider);
+	toReturn.insert(cMonster::mtGiant);
+	toReturn.insert(cMonster::mtZombie);
+	toReturn.insert(cMonster::mtSlime);
+	toReturn.insert(cMonster::mtGhast);
+	toReturn.insert(cMonster::mtZombiePigman);
+	toReturn.insert(cMonster::mtEnderman);
+	toReturn.insert(cMonster::mtCaveSpider);
+	toReturn.insert(cMonster::mtSilverfish);
+	toReturn.insert(cMonster::mtBlaze);
+	toReturn.insert(cMonster::mtMagmaCube);
+	toReturn.insert(cMonster::mtEnderDragon);
+	toReturn.insert(cMonster::mtWither);
+	toReturn.insert(cMonster::mtBat);
+	toReturn.insert(cMonster::mtWitch);
+	toReturn.insert(cMonster::mtPig);
+	toReturn.insert(cMonster::mtSheep);
+	toReturn.insert(cMonster::mtCow);
+	toReturn.insert(cMonster::mtChicken);
+	toReturn.insert(cMonster::mtSquid);
+	toReturn.insert(cMonster::mtWolf);
+	toReturn.insert(cMonster::mtMooshroom);
+	toReturn.insert(cMonster::mtSnowGolem);
+	toReturn.insert(cMonster::mtOcelot);
+	toReturn.insert(cMonster::mtIronGolem);
+	toReturn.insert(cMonster::mtVillager);
+	return toReturn;
+}
+
+
+cMobSpawner::cMobSpawner(cMonster::eFamily a_MonsterFamily,const std::set<cMonster::eType>& a_AllowedTypes) :
+	m_MonsterFamily(a_MonsterFamily),
+	m_NewPack(true),
+	m_MobType(cMonster::mtInvalidType)
+{
+	for (std::set<cMonster::eType>::const_iterator itr = a_AllowedTypes.begin(); itr != a_AllowedTypes.end(); itr++)
+	{
+		if (cMobTypesManager::getFamilyFromType(*itr) == a_MonsterFamily)
+		{
+			m_AllowedTypes.insert(*itr);
+		}
+	}
+}
+
+bool cMobSpawner::CheckPackCenter(BLOCKTYPE a_BlockType)
+{
+	// Packs of non-water mobs can only be centered on an air block
+	// Packs of water mobs can only be centered on a water block
+	if (m_MonsterFamily == cMonster::mfWater)
+	{
+		return IsBlockWater(a_BlockType);
+	}
+	else
+	{
+		return a_BlockType == E_BLOCK_AIR;
+	}
+}
+
+void cMobSpawner::addIfAllowed(cMonster::eType toAdd, std::set<cMonster::eType>& toAddIn)
+{
+	std::set<cMonster::eType>::iterator itr = m_AllowedTypes.find(toAdd);
+	if (itr != m_AllowedTypes.end())
+	{
+		toAddIn.insert(toAdd);
+	}
+}
+
+cMonster::eType cMobSpawner::ChooseMobType(EMCSBiome a_Biome)
+{
+	std::set<cMonster::eType> allowedMobs;
+
+	if (a_Biome == biMushroomIsland || a_Biome == biMushroomShore)
+	{
+		addIfAllowed(cMonster::mtMooshroom, allowedMobs);
+	}
+	else if (a_Biome == biNether)
+	{
+		addIfAllowed(cMonster::mtGhast, allowedMobs);
+		addIfAllowed(cMonster::mtZombiePigman, allowedMobs);
+		addIfAllowed(cMonster::mtMagmaCube, allowedMobs);
+	}
+	/*else if (a_Biome == biEnder)	MG TODO : figure out what are the biomes of the ender
+	{
+		addIfAllowed(cMonster::mtEnderman, allowedMobs);
+	}*/
+	else
+	{
+		addIfAllowed(cMonster::mtBat, allowedMobs);
+		addIfAllowed(cMonster::mtSpider, allowedMobs);
+		addIfAllowed(cMonster::mtZombie, allowedMobs);
+		addIfAllowed(cMonster::mtSkeleton, allowedMobs);
+		addIfAllowed(cMonster::mtCreeper, allowedMobs);
+		addIfAllowed(cMonster::mtSquid, allowedMobs);
+		
+		if (a_Biome != biDesert && a_Biome != biBeach && a_Biome != biOcean)
+		{
+			addIfAllowed(cMonster::mtSheep, allowedMobs);
+			addIfAllowed(cMonster::mtPig, allowedMobs);
+			addIfAllowed(cMonster::mtCow, allowedMobs);
+			addIfAllowed(cMonster::mtChicken, allowedMobs);
+			addIfAllowed(cMonster::mtEnderman, allowedMobs);
+			addIfAllowed(cMonster::mtSlime, allowedMobs);	// MG TODO : much more complicated rule
+			
+			if (a_Biome == biForest || a_Biome == biForestHills || a_Biome == biTaiga  || a_Biome == biTaigaHills)
+			{
+				addIfAllowed(cMonster::mtWolf, allowedMobs);
+			}
+			else if (a_Biome == biJungle || a_Biome == biJungleHills)
+			{
+				addIfAllowed(cMonster::mtOcelot, allowedMobs);
+			}
+		}
+	}
+
+	int allowedMobsSize = allowedMobs.size();
+	if (allowedMobsSize > 0)
+	{
+		std::set<cMonster::eType>::iterator itr = allowedMobs.begin();
+		int iRandom = m_Random.NextInt(allowedMobsSize,a_Biome);
+
+		for(int i = 0; i < iRandom; i++)
+		{
+			itr++;
+		}
+
+		return *itr;
+	}
+	return cMonster::mtInvalidType;
+}
+
+
+bool cMobSpawner::CanSpawnHere(cMonster::eType a_MobType, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, BLOCKTYPE a_BlockType_below, NIBBLETYPE a_BlockMeta_below, BLOCKTYPE a_BlockType_above, NIBBLETYPE a_BlockMeta_above, EMCSBiome a_Biome, int a_Level)
+{
+	bool toReturn = false;
+	std::set<cMonster::eType>::iterator itr = m_AllowedTypes.find(a_MobType);
+	if (itr != m_AllowedTypes.end())
+	{
+		// MG TODO : find a nicer paging
+		if (a_MobType == cMonster::mtSquid)
+		{
+			toReturn = (
+				IsBlockLiquid(a_BlockType) &&
+				a_Level >= 45 &&
+				a_Level <= 62
+			);
+		}
+		else if (a_MobType == cMonster::mtBat)
+		{
+			toReturn = a_Level <= 60; // MG TODO  : find a real rule
+		}
+		else
+		{
+			if (
+				a_BlockType == E_BLOCK_AIR &&
+				a_BlockType_above == E_BLOCK_AIR &&
+				! (g_BlockTransparent[a_BlockType_below])
+				)
+			{
+				if (a_MobType == cMonster::mtChicken || a_MobType == cMonster::mtPig || a_MobType == cMonster::mtCow || a_MobType == cMonster::mtSheep)
+				{
+					toReturn = (
+						a_BlockType_below == E_BLOCK_GRASS /*&& // MG TODO
+						a_LightLevel >= 9 */
+						);
+				}
+				else if (a_MobType == cMonster::mtOcelot)
+				{
+					toReturn = (
+						a_Level >= 62 &&
+						(
+							a_BlockType_below == E_BLOCK_GRASS ||
+							a_BlockType_below == E_BLOCK_LEAVES
+						) &&
+						m_Random.NextInt(3,a_Biome) != 0
+						);
+				}
+				else if (a_MobType == cMonster::mtCreeper || a_MobType == cMonster::mtSkeleton || a_MobType == cMonster::mtZombie || a_MobType == cMonster::mtSpider || a_MobType == cMonster::mtEnderman || a_MobType == cMonster::mtZombiePigman)
+				{
+					toReturn = true /*a_LightLevel <= 7 MG TODO*/;
+					/*if (a_SunLight) MG TODO 
+					{
+						if (m_Random.NextInt(2,a_Biome) != 0)
+						{
+							toReturn = false;
+						}
+					}*/
+				}
+				else if (a_MobType == cMonster::mtSlime)
+				{
+					toReturn = a_Level <= 40;
+					// MG TODO : much more complicated rules		
+				}
+				else if (a_MobType == cMonster::mtGhast)
+				{
+					toReturn = m_Random.NextInt(20,a_Biome) == 0;
+				}
+				else
+				{
+					LOGD("MG TODO : check I've got a Rule to write for type %d",a_MobType);
+					toReturn = true;
+				}
+			}
+		}
+	}
+	return toReturn;
+}
+
+
+cMonster* cMobSpawner::TryToSpawnHere(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, BLOCKTYPE a_BlockType_below, NIBBLETYPE a_BlockMeta_below, BLOCKTYPE a_BlockType_above, NIBBLETYPE a_BlockMeta_above, EMCSBiome a_Biome, int a_Level, int& a_MaxPackSize)
+{
+	cMonster* toReturn = NULL;
+	if (m_NewPack)
+	{
+		m_MobType = ChooseMobType(a_Biome);
+		if (m_MobType == cMonster::mtInvalidType)
+		{
+			return toReturn;
+		}
+		if (m_MobType == cMonster::mtWolf)
+		{
+			a_MaxPackSize = 8;
+		}
+		else if (m_MobType == cMonster::mtGhast)
+		{
+			a_MaxPackSize = 1;
+		}
+		m_NewPack = false;
+	}
+
+	
+	if (CanSpawnHere(m_MobType, a_BlockType, a_BlockMeta, a_BlockType_below, a_BlockMeta_below, a_BlockType_above, a_BlockMeta_above, a_Biome, a_Level))
+	{
+		cMonster* newMob = cMobTypesManager::NewMonsterFromType(m_MobType);
+		if (newMob)
+		{
+			m_Spawned.insert(newMob);
+		}
+		toReturn = newMob;
+	}
+	return toReturn;
+}
+
+void cMobSpawner::NewPack()
+{
+	m_NewPack = true;
+}
+
+cMobSpawner::tSpawnedContainer& cMobSpawner::getSpawned()
+{
+	return m_Spawned;
+}
+
+bool cMobSpawner::CanSpawnSomething()
+{
+	return m_AllowedTypes.size() > 0;
+}
diff --git a/source/MobSpawner.h b/source/MobSpawner.h
new file mode 100644
index 000000000..bb9e95172
--- /dev/null
+++ b/source/MobSpawner.h
@@ -0,0 +1,72 @@
+
+#pragma once
+
+#include <set>
+#include "BlockID.h"
+#include "ChunkDef.h"
+#include "FastRandom.h"
+#include "Mobs/Monster.h" //this is a side-effect of keeping Mobfamily inside Monster class. I'd prefer to keep both (Mobfamily and Monster) inside a "Monster" namespace MG TODO : do it
+
+class cChunk;
+
+
+// This class is used to determine wich monster can be spawned on wich place
+// it is essentially static (f.i. Squids spawn in water, Zombie spawn in dark places)
+// but it also has dynamic part depending on the world.ini
+class cMobSpawner
+{
+public :
+	// constructor
+	// a_MobFamily is the Family of mobs that this spawner will spawn
+	// a_AllowedTypes is the set of types allowed for mobs it will spawn. Empty set
+	// would result in no spawn at all
+	// Allowed mobs thah are not of the right Family will not be include (no warning)
+	cMobSpawner(cMonster::eFamily MobFamily, const std::set<cMonster::eType>& a_AllowedTypes);
+
+	// Check if specified block can be a Pack center for this spawner
+	bool CheckPackCenter(BLOCKTYPE a_BlockType);
+
+	// Try to create a monster here
+	// if this is the first of a Pack : determine the type of monster
+	// BlockType & BlockMeta are use to know what kind of Mob can Spawn here
+	// MaxPackSize is set to the maximal size for a pack this type of mob
+	cMonster* TryToSpawnHere(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, BLOCKTYPE a_BlockType_below, NIBBLETYPE a_BlockMeta_below, BLOCKTYPE a_BlockType_above, NIBBLETYPE a_BlockMeta_above, EMCSBiome a_Biome, int a_Level, int& a_MaxPackSize);
+
+	// mark the beginning of a new Pack
+	// all mobs of the same Pack are the same type
+	void NewPack();
+
+	// return true if there is at least one allowed type
+	bool CanSpawnSomething();
+
+	typedef const std::set<cMonster*> tSpawnedContainer;
+	tSpawnedContainer& getSpawned();
+
+protected : 
+	// return true if specified type of mob can spawn on specified block
+	bool CanSpawnHere(cMonster::eType a_MobType, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, BLOCKTYPE a_BlockType_below, NIBBLETYPE a_BlockMeta_below, BLOCKTYPE a_BlockType_above, NIBBLETYPE a_BlockMeta_above, EMCSBiome a_Biome, int a_Level);
+
+	// return a random type that can spawn on specified biome.
+	// returns E_ENTITY_TYPE_DONOTUSE if none is possible
+	cMonster::eType ChooseMobType(EMCSBiome a_Biome);
+
+	// add toAdd inside toAddIn, if toAdd is in m_AllowedTypes
+	void addIfAllowed(cMonster::eType toAdd, std::set<cMonster::eType>& toAddIn);
+
+protected : 
+	cMonster::eFamily m_MonsterFamily;
+	std::set<cMonster::eType> m_AllowedTypes;
+	bool m_NewPack;
+	cMonster::eType m_MobType;
+	std::set<cMonster*> m_Spawned;
+	cFastRandom m_Random;
+
+public : 
+	typedef const std::set<cMonster::eType> tMobTypes; // MG TODO : maybe relocate all those statics set/maps in the same place ?
+	static tMobTypes& m_MobTypes();
+
+protected : 
+	static tMobTypes initMobTypesBeforeCx11();
+
+
+};
diff --git a/source/MobTypesManager.cpp b/source/MobTypesManager.cpp
new file mode 100644
index 000000000..600d7992d
--- /dev/null
+++ b/source/MobTypesManager.cpp
@@ -0,0 +1,184 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "MobTypesManager.h"
+#include "MersenneTwister.h"
+#include "Mobs/Monster.h"
+#include "Mobs/IncludeAllMonsters.h"
+#include "FastRandom.h"
+
+
+cMobTypesManager::tMobTypes2Names& cMobTypesManager::m_MobsTypes2Names()
+{
+	static std::map<cMonster::eType,std::string>* value = new std::map<cMonster::eType,std::string>(MobTypes2NamesInitializerBeforeCx11());
+	return *value;
+}
+
+cMobTypesManager::tMobTypes2Names cMobTypesManager::MobTypes2NamesInitializerBeforeCx11()
+{	
+	std::map<cMonster::eType,std::string> toReturn;
+	typedef std::map<cMonster::eType,std::string>::value_type ValueType;
+	toReturn.insert(ValueType(cMonster::mtMagmaCube,"Magmacube"));
+	toReturn.insert(ValueType(cMonster::mtSlime,"Slime"));
+	toReturn.insert(ValueType(cMonster::mtBat,"Bat"));
+	toReturn.insert(ValueType(cMonster::mtBlaze,"Blaze"));
+	toReturn.insert(ValueType(cMonster::mtCaveSpider,"Cavespider"));
+	toReturn.insert(ValueType(cMonster::mtChicken,"Chicken"));
+	toReturn.insert(ValueType(cMonster::mtCow,"Cow"));
+	toReturn.insert(ValueType(cMonster::mtCreeper,"Creeper"));
+	toReturn.insert(ValueType(cMonster::mtEnderman,"Enderman"));
+	toReturn.insert(ValueType(cMonster::mtGhast,"Ghast"));
+	toReturn.insert(ValueType(cMonster::mtMooshroom,"Mooshroom"));
+	toReturn.insert(ValueType(cMonster::mtOcelot,"Ocelot"));
+	toReturn.insert(ValueType(cMonster::mtPig,"Pig"));
+	toReturn.insert(ValueType(cMonster::mtSheep,"Sheep"));
+	toReturn.insert(ValueType(cMonster::mtSilverfish,"Silverfish"));
+	toReturn.insert(ValueType(cMonster::mtSkeleton,"Skeleton"));
+	toReturn.insert(ValueType(cMonster::mtSpider,"Spider"));
+	toReturn.insert(ValueType(cMonster::mtSquid,"Squid"));
+	toReturn.insert(ValueType(cMonster::mtVillager,"Villager"));
+	toReturn.insert(ValueType(cMonster::mtWitch,"Witch"));
+	toReturn.insert(ValueType(cMonster::mtWolf,"Wolf"));
+	toReturn.insert(ValueType(cMonster::mtZombie,"Zombie"));
+	toReturn.insert(ValueType(cMonster::mtZombiePigman,"Zombiepigman"));	
+	return toReturn;
+}
+
+cMobTypesManager::tMobType2Family& cMobTypesManager::m_MobsType2Family()
+{
+	static std::map<cMonster::eType,cMonster::eFamily>* value = new std::map<cMonster::eType,cMonster::eFamily>(MobType2FamilyInitializerBeforeCx11());
+	return *value;
+}
+
+cMobTypesManager::tMobType2Family cMobTypesManager::MobType2FamilyInitializerBeforeCx11()
+{
+	std::map<cMonster::eType,cMonster::eFamily> toReturn;
+	typedef std::map<cMonster::eType,cMonster::eFamily>::value_type ValueType;
+	toReturn.insert(ValueType(cMonster::mtBat,cMonster::mfAmbient));
+	toReturn.insert(ValueType(cMonster::mtSquid,cMonster::mfWater));
+	toReturn.insert(ValueType(cMonster::mtCow,cMonster::mfPassive));
+	toReturn.insert(ValueType(cMonster::mtPig,cMonster::mfPassive));
+	toReturn.insert(ValueType(cMonster::mtSheep,cMonster::mfPassive));
+	toReturn.insert(ValueType(cMonster::mtChicken,cMonster::mfPassive));
+	toReturn.insert(ValueType(cMonster::mtVillager,cMonster::mfPassive));
+	toReturn.insert(ValueType(cMonster::mtMagmaCube,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtSlime,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtBlaze,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtCaveSpider,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtCreeper,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtEnderman,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtGhast,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtMooshroom,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtOcelot,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtSilverfish,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtSkeleton,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtSpider,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtWitch,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtWolf,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtZombie,cMonster::mfHostile));
+	toReturn.insert(ValueType(cMonster::mtZombiePigman,cMonster::mfHostile));	
+
+	return toReturn;
+}
+
+
+cFastRandom& cMobTypesManager::m_Random()
+{
+	static cFastRandom* value = new cFastRandom();
+	return *value;
+}
+
+
+cMonster* cMobTypesManager::NewMonsterFromType(cMonster::eType a_MobType, int a_Size)
+{
+	cMonster * toReturn = NULL;
+
+	// unspecified size get rand[1,3] for Monsters that need size
+	switch (a_MobType)
+	{
+		case cMonster::mtMagmaCube:
+		case cMonster::mtSlime:
+			if (a_Size == -1)
+			{
+				a_Size = m_Random().NextInt(2,a_MobType)+1;
+			}
+			if (a_Size <= 0 || a_Size >= 4)
+			{
+				ASSERT(!"Random for size was supposed to pick in [1..3] and picked outside");
+				a_Size = 1;
+			}
+			break;
+		default : break;
+	}
+
+	// the big switch
+	switch (a_MobType)
+	{
+		case cMonster::mtMagmaCube:     toReturn  = new cMagmaCube(a_Size);             break;
+		case cMonster::mtSlime:         toReturn  = new cSlime(a_Size);                 break;
+		case cMonster::mtBat:           toReturn  = new cBat();                         break;
+		case cMonster::mtBlaze:         toReturn  = new cBlaze();                       break;
+		case cMonster::mtCaveSpider:    toReturn  = new cCavespider();                  break;
+		case cMonster::mtChicken:       toReturn  = new cChicken();                     break;
+		case cMonster::mtCow:           toReturn  = new cCow();                         break;
+		case cMonster::mtCreeper:       toReturn  = new cCreeper();                     break;
+		case cMonster::mtEnderman:      toReturn  = new cEnderman();                    break;
+		case cMonster::mtGhast:         toReturn  = new cGhast();                       break;
+		case cMonster::mtMooshroom:     toReturn  = new cMooshroom();                   break;
+		case cMonster::mtOcelot:        toReturn  = new cOcelot();                      break;
+		case cMonster::mtPig:           toReturn  = new cPig();                         break;
+		// TODO: Implement sheep color
+		case cMonster::mtSheep:         toReturn  = new cSheep(0);                      break;
+		case cMonster::mtSilverfish:    toReturn  = new cSilverfish();                  break;
+		// TODO: Implement wither geration
+		case cMonster::mtSkeleton:      toReturn  = new cSkeleton(false);               break;
+		case cMonster::mtSpider:        toReturn  = new cSpider();                      break;
+		case cMonster::mtSquid:         toReturn  = new cSquid();                       break;
+		case cMonster::mtVillager:      toReturn  = new cVillager(cVillager::vtFarmer); break;
+		case cMonster::mtWitch:         toReturn  = new cWitch();                       break;
+		case cMonster::mtWolf:          toReturn  = new cWolf();                        break;
+		case cMonster::mtZombie:        toReturn  = new cZombie(false);                 break;
+		case cMonster::mtZombiePigman:  toReturn  = new cZombiePigman();                break;
+		default:
+		{
+			ASSERT(!"Unhandled Mob type");
+		}
+	}
+	return toReturn;
+}
+
+
+const std::string& cMobTypesManager::fromMobTypeToString(cMonster::eType a_MobType)
+{
+	static std::string toReturnDefault = "";
+	std::string& toReturn = toReturnDefault;
+	std::map<cMonster::eType,std::string>::const_iterator itr = m_MobsTypes2Names().find(a_MobType);
+	if (itr != m_MobsTypes2Names().end())
+	{
+		toReturn = itr->second;
+	}
+	return toReturn;
+}
+
+cMonster::eType cMobTypesManager::fromStringToMobType(const std::string& a_Name)
+{
+	for(std::map<cMonster::eType,std::string>::const_iterator itr = m_MobsTypes2Names().begin(); itr != m_MobsTypes2Names().end(); itr++)
+	{
+		if (itr->second == a_Name)
+		{
+			return itr->first;			
+		}
+	}
+	return cMonster::mtInvalidType;
+}
+
+cMonster::eFamily cMobTypesManager::getFamilyFromType(cMonster::eType a_Type)
+{
+	cMonster::eFamily toReturn = cMonster::mfMaxplusone;
+	std::map<cMonster::eType,cMonster::eFamily>::const_iterator itr = m_MobsType2Family().find(a_Type);
+	if (itr != m_MobsType2Family().end())
+	{
+		toReturn = itr->second;
+	}
+	return toReturn;
+}
diff --git a/source/MobTypesManager.h b/source/MobTypesManager.h
new file mode 100644
index 000000000..941dac729
--- /dev/null
+++ b/source/MobTypesManager.h
@@ -0,0 +1,44 @@
+
+#pragma once
+
+#include <vector>
+#include "Mobs/Monster.h" // this is a side effect of declaring cMonster::eType inside cMonster MG TODO : make a namespace
+
+class cFastRandom;
+
+// this aggregate static functionnalities about mob types (some could call it helper)
+// functionnalities are (in the first version) :
+// - create a mob from its type (as enum) (in that way it is a compiler-proxy for mobs)
+// - can transform MobTypes from enums to string and reciprocal
+// - return mob family from providen type
+class cMobTypesManager
+{
+public:
+	static const std::string& fromMobTypeToString(cMonster::eType a_MobType);
+	static cMonster::eType fromStringToMobType(const std::string& a_MobTypeName);
+	static cMonster::eFamily getFamilyFromType(cMonster::eType a_MobType);
+
+protected : 
+	typedef const std::map<cMonster::eType,std::string> tMobTypes2Names;
+	static tMobTypes2Names& m_MobsTypes2Names();
+	static tMobTypes2Names MobTypes2NamesInitializerBeforeCx11();
+
+	typedef const std::map<cMonster::eType,cMonster::eFamily> tMobType2Family;
+	static tMobType2Family& m_MobsType2Family();
+	static tMobType2Family MobType2FamilyInitializerBeforeCx11();
+
+	static cFastRandom& m_Random();
+	
+public :
+	/** create a new object of the specified mob.
+		Warning, new without delete here;
+	a_MobType is the type of the mob to be created
+	a_Size is the size (for mobs with size)
+	if a_Size is let to -1 for entities that need size, size will be random
+	assert or return null if mob type is not specified
+	assert if size < 1 or > 3 for entities that need size
+	*/
+	static cMonster* NewMonsterFromType(cMonster::eType a_MobType, int a_Size=-1);
+
+};  // tolua_export
+
diff --git a/source/Mobs/AggressiveMonster.cpp b/source/Mobs/AggressiveMonster.cpp
index 2eae772d7..93dba6d7b 100644
--- a/source/Mobs/AggressiveMonster.cpp
+++ b/source/Mobs/AggressiveMonster.cpp
@@ -95,5 +95,3 @@ void cAggressiveMonster::Tick(float a_Dt, cChunk & a_Chunk)
 }
 
 
-
-
diff --git a/source/Mobs/AggressiveMonster.h b/source/Mobs/AggressiveMonster.h
index 1eff1831e..f22ed5b89 100644
--- a/source/Mobs/AggressiveMonster.h
+++ b/source/Mobs/AggressiveMonster.h
@@ -19,6 +19,7 @@ public:
 	virtual void InStateChasing(float a_Dt) override;
 	
 	virtual void EventSeePlayer(cEntity *) override;
+
 	
 protected:
 	float m_ChaseTime;
diff --git a/source/Mobs/Bat.cpp b/source/Mobs/Bat.cpp
new file mode 100644
index 000000000..715f25483
--- /dev/null
+++ b/source/Mobs/Bat.cpp
@@ -0,0 +1,15 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "Bat.h"
+#include "../Vector3d.h"
+#include "../Chunk.h"
+
+
+cBat::cBat(void) :
+		// TODO: The size is only a guesstimate, measure in vanilla and fix the size values here
+	super("Bat", 65,  "mob.bat.hurt", "mob.bat.death", 0.7, 0.7)
+{
+}
+
+
diff --git a/source/Mobs/Bat.h b/source/Mobs/Bat.h
index 0b50e06cd..e878d0ee8 100644
--- a/source/Mobs/Bat.h
+++ b/source/Mobs/Bat.h
@@ -13,13 +13,10 @@ class cBat :
 	typedef cPassiveMonster super;
 	
 public:
-	cBat(void) :
-		super("Bat", 65, "mob.bat.hurt", "mob.bat.death", 0.5, 0.9)
-	{
-	}
+	cBat(void);
 
 	CLASS_PROTODEF(cBat);
-
+	
 	bool IsHanging(void) const {return false; }
 } ;
 
diff --git a/source/Mobs/IncludeAllMonsters.h b/source/Mobs/IncludeAllMonsters.h
new file mode 100644
index 000000000..1b436a11f
--- /dev/null
+++ b/source/Mobs/IncludeAllMonsters.h
@@ -0,0 +1,29 @@
+#include "Bat.h"
+#include "Blaze.h"
+#include "Cavespider.h"
+#include "Chicken.h"
+#include "Cow.h"
+#include "Creeper.h"
+#include "Enderman.h"
+#include "EnderDragon.h"
+#include "Ghast.h"
+#include "Giant.h"
+#include "Horse.h"
+#include "IronGolem.h"
+#include "Magmacube.h"
+#include "Mooshroom.h"
+#include "Ocelot.h"
+#include "Pig.h"
+#include "Sheep.h"
+#include "Silverfish.h"
+#include "Skeleton.h"
+#include "Slime.h"
+#include "SnowGolem.h"
+#include "Spider.h"
+#include "Squid.h"
+#include "Villager.h"
+#include "Witch.h"
+#include "Wither.h"
+#include "Wolf.h"
+#include "Zombie.h"
+#include "Zombiepigman.h"
diff --git a/source/Mobs/Monster.cpp b/source/Mobs/Monster.cpp
index 334229a42..51ea644d3 100644
--- a/source/Mobs/Monster.cpp
+++ b/source/Mobs/Monster.cpp
@@ -9,6 +9,7 @@
 #include "../Entities/Player.h"
 #include "../Defines.h"
 #include "../MonsterConfig.h"
+#include "../MobTypesManager.h"
 #include "../MersenneTwister.h"
 
 #include "../Vector3f.h"
@@ -17,6 +18,7 @@
 #include "../Tracer.h"
 #include "../Chunk.h"
 
+
 // #include "../../iniFile/iniFile.h"
 
 
@@ -510,3 +512,7 @@ void cMonster::HandleDaylightBurning(cChunk & a_Chunk)
 
 
 
+cMonster::eFamily cMonster::GetMobFamily(void) const
+{
+	return cMobTypesManager::getFamilyFromType(GetMobTypeAsEnum());
+}
diff --git a/source/Mobs/Monster.h b/source/Mobs/Monster.h
index d784f2eec..be60d9e00 100644
--- a/source/Mobs/Monster.h
+++ b/source/Mobs/Monster.h
@@ -55,7 +55,17 @@ public:
 		mtWolf         = E_META_SPAWN_EGG_WOLF,
 		mtZombie       = E_META_SPAWN_EGG_ZOMBIE,
 		mtZombiePigman = E_META_SPAWN_EGG_ZOMBIE_PIGMAN,
+		mtInvalidType
+	} ;
+
+	enum eFamily
+	{
+		mfHostile  = 0, // Spider, Zombies ...
+		mfPassive  = 1, // Cows, Pigs
+		mfAmbient  = 2, // Bats
+		mfWater    = 3, // Squid
 
+		mfMaxplusone, // Nothing. Be sure this is the last and the others are in order
 	} ;
 	
 	// tolua_end
@@ -82,7 +92,10 @@ public:
 	virtual void MoveToPosition(const Vector3f & a_Position);
 	virtual bool ReachedDestination(void);
 	
-	char GetMobType(void) const {return m_MobType; }
+	char GetMobType(void) const {return m_MobType; } // MG TODO : see if we can delete this one.
+	eType GetMobTypeAsEnum(void) const {return (eType)m_MobType; }  // MG TODO : see if we should store m_MobType as enum instead of char.
+	eFamily GetMobFamily(void) const;
+
 
 	const char * GetState();
 	void SetState(const AString & str);
diff --git a/source/Mobs/PassiveMonster.cpp b/source/Mobs/PassiveMonster.cpp
index 7a6140c04..8c69c8059 100644
--- a/source/Mobs/PassiveMonster.cpp
+++ b/source/Mobs/PassiveMonster.cpp
@@ -56,3 +56,4 @@ void cPassiveMonster::Tick(float a_Dt, cChunk & a_Chunk)
 
 
 
+
diff --git a/source/Mobs/PassiveMonster.h b/source/Mobs/PassiveMonster.h
index ae0bea3fb..908bb0ce6 100644
--- a/source/Mobs/PassiveMonster.h
+++ b/source/Mobs/PassiveMonster.h
@@ -19,6 +19,7 @@ public:
 
 	/// When hit by someone, run away
 	virtual void DoTakeDamage(TakeDamageInfo & a_TDI) override;
+
 } ;
 
 
diff --git a/source/Mobs/Squid.cpp b/source/Mobs/Squid.cpp
index cb796f5ec..e6a44079a 100644
--- a/source/Mobs/Squid.cpp
+++ b/source/Mobs/Squid.cpp
@@ -54,4 +54,3 @@ void cSquid::Tick(float a_Dt, cChunk & a_Chunk)
 
 
 
-
diff --git a/source/Mobs/Squid.h b/source/Mobs/Squid.h
index 35d7295b3..ad299b95c 100644
--- a/source/Mobs/Squid.h
+++ b/source/Mobs/Squid.h
@@ -20,6 +20,7 @@ public:
 	CLASS_PROTODEF(cSquid);
 	
 	virtual void GetDrops(cItems & a_Drops, cEntity * a_Killer = NULL) override;
+
 } ;
 
 
diff --git a/source/World.cpp b/source/World.cpp
index ef56e7fe9..967cd8f59 100644
--- a/source/World.cpp
+++ b/source/World.cpp
@@ -28,35 +28,10 @@
 #include "Simulator/VaporizeFluidSimulator.h"
 
 // Mobs:
-#include "Mobs/Bat.h"
-#include "Mobs/Blaze.h"
-#include "Mobs/Cavespider.h"
-#include "Mobs/Chicken.h"
-#include "Mobs/Cow.h"
-#include "Mobs/Creeper.h"
-#include "Mobs/Enderman.h"
-#include "Mobs/EnderDragon.h"
-#include "Mobs/Ghast.h"
-#include "Mobs/Giant.h"
-#include "Mobs/Horse.h"
-#include "Mobs/IronGolem.h"
-#include "Mobs/Magmacube.h"
-#include "Mobs/Mooshroom.h"
-#include "Mobs/Ocelot.h"
-#include "Mobs/Pig.h"
-#include "Mobs/Sheep.h"
-#include "Mobs/Silverfish.h"
-#include "Mobs/Skeleton.h"
-#include "Mobs/Slime.h"
-#include "Mobs/SnowGolem.h"
-#include "Mobs/Spider.h"
-#include "Mobs/Squid.h"
-#include "Mobs/Villager.h"
-#include "Mobs/Witch.h"
-#include "Mobs/Wither.h"
-#include "Mobs/Wolf.h"
-#include "Mobs/Zombie.h"
-#include "Mobs/Zombiepigman.h"
+#include "Mobs/IncludeAllMonsters.h"
+#include "MobCensus.h"
+#include "MobSpawner.h"
+#include "MobTypesManager.h"
 
 #include "MersenneTwister.h"
 #include "Generating/Trees.h"
@@ -252,7 +227,6 @@ cWorld::cWorld(const AString & a_WorldName) :
 	m_WorldAge(0),
 	m_TimeOfDay(0),
 	m_LastTimeUpdate(0),
-	m_LastSpawnMonster(0),
 	m_RSList(0),
 	m_Weather(eWeather_Sunny),
 	m_WeatherInterval(24000),  // Guaranteed 1 day of sunshine at server start :)
@@ -515,15 +489,19 @@ void cWorld::Start(void)
 
 	m_GameMode = (eGameMode)IniFile.GetValueSetI("GameMode", "GameMode", m_GameMode);
 
-	m_bAnimals = true;
-	m_SpawnMonsterRate = 200;  // 1 mob each 10 seconds
-	cIniFile IniFile2("settings.ini");
-	if (IniFile2.ReadFile())
+	m_bAnimals = IniFile.GetValueB("Monsters", "AnimalsOn", true);
+	AString sAllMonsters = IniFile.GetValue("Monsters", "Types");
+	AStringVector SplitList = StringSplit(sAllMonsters, ",");
+	for (unsigned int i = 0; i < SplitList.size(); ++i)
 	{
-		m_bAnimals = IniFile2.GetValueB("Monsters", "AnimalsOn", true);
-		m_SpawnMonsterRate = (Int64)(IniFile2.GetValueF("Monsters", "AnimalSpawnInterval", 10) * 20);  // Convert from secs to ticks
-		
-	}
+		cMonster::eType ToAdd = cMobTypesManager::fromStringToMobType(SplitList[i]);
+		if (ToAdd != cMonster::mtInvalidType)
+		{
+			m_AllowedMobs.insert(ToAdd);
+			LOGD("Allowed mob: %s",cMobTypesManager::fromMobTypeToString(ToAdd).c_str()); // a bit reverse working, but very few ressources wasted
+		}
+	};
+
 
 	m_ChunkMap = new cChunkMap(this);
 	
@@ -553,6 +531,13 @@ void cWorld::Start(void)
 	m_ChunkSender.Start(this);
 	m_TickThread.Start();
 
+	// Init of the spawn monster time (as they are supposed to have different spawn rate)
+	m_LastSpawnMonster.insert(std::map<cMonster::eFamily,Int64>::value_type(cMonster::mfHostile,0));
+	m_LastSpawnMonster.insert(std::map<cMonster::eFamily,Int64>::value_type(cMonster::mfPassive,0));
+	m_LastSpawnMonster.insert(std::map<cMonster::eFamily,Int64>::value_type(cMonster::mfAmbient,0));
+	m_LastSpawnMonster.insert(std::map<cMonster::eFamily,Int64>::value_type(cMonster::mfWater,0));
+
+
 	// Save any changes that the defaults may have done to the ini file:
 	if (!IniFile.WriteFile())
 	{
@@ -648,7 +633,7 @@ void cWorld::Tick(float a_Dt)
 		UnloadUnusedChunks();
 	}
 
-	TickSpawnMobs(a_Dt);
+	TickMobs(a_Dt);
 
 	std::vector<int> m_RSList_copy(m_RSList);
 	
@@ -733,125 +718,57 @@ void cWorld::TickWeather(float a_Dt)
 
 
 
-void cWorld::TickSpawnMobs(float a_Dt)
+void cWorld::TickMobs(float a_Dt)
 {
-	if (!m_bAnimals || (m_WorldAge - m_LastSpawnMonster <= m_SpawnMonsterRate))
+	if (!m_bAnimals)
 	{
 		return;
 	}
-	
-	m_LastSpawnMonster = m_WorldAge;
-	Vector3d SpawnPos;
-	{
-		cCSLock Lock(m_CSPlayers);
-		if (m_Players.size() <= 0)
-		{
-			return;
-		}
-		int RandomPlayerIdx = m_TickRand.randInt() & m_Players.size();
-		cPlayerList::iterator itr = m_Players.begin();
-		for (int i = 1; i < RandomPlayerIdx; i++)
-		{
-			itr++;
-		}
-		SpawnPos = (*itr)->GetPosition();
-	}
-
-	int dayRand   = (m_TickRand.randInt() /  7) %  6;
-	int nightRand = (m_TickRand.randInt() / 11) % 10;
 
-	SpawnPos += Vector3d((double)(m_TickRand.randInt() % 64) - 32, (double)(m_TickRand.randInt() % 64) - 32, (double)(m_TickRand.randInt() % 64) - 32);
-	int Height = GetHeight((int)SpawnPos.x, (int)SpawnPos.z);
-
-	int MobType = -1;
-	int Biome = GetBiomeAt((int)SpawnPos.x, (int)SpawnPos.z);
-	switch (Biome)
+	// before every Mob action, we have to "counts" them depending on the distance to players, on their megatype ...
+	cMobCensus MobCensus;
+	m_ChunkMap->CollectMobCensus(MobCensus);
+	for(cMobFamilyCollecter::tMobFamilyList::const_iterator itr = cMobFamilyCollecter::m_AllFamilies().begin(); itr != cMobFamilyCollecter::m_AllFamilies().end(); itr++)
 	{
-		case biNether:
-		{
-			// Spawn nether mobs
-			switch (nightRand)
-			{
-				case 0: MobType = cMonster::mtBlaze;        break;
-				case 1: MobType = cMonster::mtGhast;        break;
-				case 2: MobType = cMonster::mtGhast;        break;
-				case 3: MobType = cMonster::mtGhast;        break;
-				case 4: MobType = cMonster::mtZombiePigman; break;
-				case 5: MobType = cMonster::mtZombiePigman; break;
-				case 6: MobType = cMonster::mtZombiePigman; break;
-				case 7: MobType = cMonster::mtZombiePigman; break;
-				case 8: MobType = cMonster::mtZombiePigman; break;
-				case 9: MobType = cMonster::mtZombiePigman; break;
-			}
-			break;
-		}
-		
-		case biEnd:
-		{
-			// Spawn only The End mobs
-			switch (nightRand)
-			{
-				case 0: MobType = cMonster::mtEnderDragon;  break;
-				case 1: MobType = cMonster::mtEnderman;     break;
-				case 2: MobType = cMonster::mtEnderman;     break;
-				case 3: MobType = cMonster::mtEnderman;     break;
-				case 4: MobType = cMonster::mtEnderman;     break;
-				case 5: MobType = cMonster::mtEnderman;     break;
-				case 6: MobType = cMonster::mtEnderman;     break;
-				case 7: MobType = cMonster::mtEnderman;     break;
-				case 8: MobType = cMonster::mtEnderman;     break;
-				case 9: MobType = cMonster::mtEnderman;     break;
-			}
-			break;
-		}
-		
-		case biMushroomIsland:
-		case biMushroomShore:
-		{
-			// Mushroom land gets only mooshrooms
-			MobType = cMonster::mtMooshroom;
-			break;
-		}
-		
-		default:
+		cMobCensus::tMobSpawnRate::const_iterator spawnrate = cMobCensus::m_SpawnRate().find(*itr);
+		// hostile mobs are spawned more often
+		if (spawnrate != cMobCensus::m_SpawnRate().end() && m_LastSpawnMonster[*itr] < m_WorldAge - spawnrate->second)
 		{
-			// Overworld biomes depend on whether it's night or day:
-			if (m_TimeOfDay >= 12000 + 1000)
-			{
-				// Night mobs:
-				switch (nightRand)
-				{			
-					case 0: MobType = cMonster::mtSpider;     break;
-					case 1: MobType = cMonster::mtZombie;     break;				
-					case 2: MobType = cMonster::mtEnderman;   break;
-					case 3: MobType = cMonster::mtCreeper;    break;
-					case 4: MobType = cMonster::mtCaveSpider; break;
-					case 7: MobType = cMonster::mtSlime;      break;
-					case 8: MobType = cMonster::mtSilverfish; break;
-					case 9: MobType = cMonster::mtSkeleton;   break;
-				}
-			}  // if (night)
-			else
+			m_LastSpawnMonster[*itr] = m_WorldAge;
+			// each megatype of mob has it's own cap
+			if (!(MobCensus.isCaped(*itr)))
 			{
-				// During the day:
-				switch (dayRand)
+				if (m_bAnimals)
 				{
-					case 0: MobType = cMonster::mtChicken; break;
-					case 1: MobType = cMonster::mtCow;     break;
-					case 2: MobType = cMonster::mtPig;     break;
-					case 3: MobType = cMonster::mtSheep;   break;
-					case 4: MobType = cMonster::mtSquid;   break;
-					case 5: MobType = cMonster::mtWolf;    break;
-					case 6: MobType = cMonster::mtHorse;   break;
+
+					cMobSpawner Spawner(*itr,m_AllowedMobs);
+					if (Spawner.CanSpawnSomething())
+					{
+						m_ChunkMap->SpawnMobs(Spawner);
+						// do the spawn
+						
+						for(cMobSpawner::tSpawnedContainer::const_iterator itr2 = Spawner.getSpawned().begin(); itr2 != Spawner.getSpawned().end(); itr2++)
+						{
+							SpawnMobFinalize(*itr2);
+						}
+					}
 				}
-			}  // else (night)
-		}  // case overworld biomes
-	}  // switch (biome)
+			}		   
+		}
+	}
+
+	// move close mobs
+	cMobProximityCounter::sIterablePair allCloseEnoughToMoveMobs = MobCensus.getProximityCounter().getMobWithinThosesDistances(-1,64*16);// MG TODO : deal with this magic number (the 16 is the size of a block)
+	for(cMobProximityCounter::tDistanceToMonster::const_iterator itr = allCloseEnoughToMoveMobs.m_Begin; itr != allCloseEnoughToMoveMobs.m_End; itr++)
+	{
+		itr->second.m_Monster.Tick(a_Dt,itr->second.m_Chunk);
+	}
 
-	if (MobType >= 0)
+	// remove too far mobs
+	cMobProximityCounter::sIterablePair allTooFarMobs = MobCensus.getProximityCounter().getMobWithinThosesDistances(128*16,-1);// MG TODO : deal with this magic number (the 16 is the size of a block)
+	for(cMobProximityCounter::tDistanceToMonster::const_iterator itr = allTooFarMobs.m_Begin; itr != allTooFarMobs.m_End; itr++)
 	{
-		// A proper mob type was selected, now spawn the mob:
-		SpawnMob(SpawnPos.x, SpawnPos.y, SpawnPos.z, (cMonster::eType)MobType);
+		itr->second.m_Monster.Destroy(true);
 	}
 }
 
@@ -2594,80 +2511,36 @@ int cWorld::SpawnMob(double a_PosX, double a_PosY, double a_PosZ, cMonster::eTyp
 	
 	int SlSize = GetTickRandomNumber(2) + 1;  // 1 .. 3 - Slime
 	int ShColor = GetTickRandomNumber(15); // 0 .. 15 - Sheep
-	bool SkType = GetDimension() == biNether; // Skeleton
+	bool SkType = GetDimension() == dimNether ; // Skeleton
 
-	int VilType = GetTickRandomNumber(cVillager::vtMax); // 0 .. 6 - Villager
-	if (VilType == 6) { VilType = 0; } // Give farmers a better chance of spawning
+	Monster = cMobTypesManager::NewMonsterFromType(a_MonsterType);
+	if (Monster)
+		Monster->SetPosition(a_PosX, a_PosY, a_PosZ);
+	return SpawnMobFinalize(Monster);
+}
 
-	int HseType = GetTickRandomNumber(7); // 0 .. 7 - Horse Type (donkey, zombie, etc.)
-	int HseColor = GetTickRandomNumber(6); // 0 .. 6 - Horse
-	int HseStyle = GetTickRandomNumber(4); // 0 .. 4 - Horse
-	int HseTameTimes = GetTickRandomNumber(6) + 1; // 1 .. 7 - Horse tame amount
-	if ((HseType == 5) || (HseType == 6) || (HseType == 7)) { HseType = 0; } // 5,6,7 = 0 because little chance of getting 0 with TickRand
-	
-	switch (a_MonsterType)
-	{
-		case cMonster::mtBat:          Monster = new cBat();             break;
-		case cMonster::mtBlaze:        Monster = new cBlaze();           break;
-		case cMonster::mtCaveSpider:   Monster = new cCavespider();      break;
-		case cMonster::mtChicken:      Monster = new cChicken();         break;
-		case cMonster::mtCow:          Monster = new cCow();             break;
-		case cMonster::mtCreeper:      Monster = new cCreeper();         break;
-		case cMonster::mtEnderman:     Monster = new cEnderman();        break;
-		case cMonster::mtEnderDragon:  Monster = new cEnderDragon();     break;
-		case cMonster::mtGhast:        Monster = new cGhast();           break;
-		case cMonster::mtGiant:        Monster = new cGiant();           break;
-		case cMonster::mtHorse:
-		{
-			Monster = new cHorse(HseType, HseColor, HseStyle, HseTameTimes); break;
-		}
-		case cMonster::mtIronGolem:    Monster = new cIronGolem();       break;
-		case cMonster::mtMagmaCube:    Monster = new cMagmaCube(SlSize); break;
-		case cMonster::mtMooshroom:    Monster = new cMooshroom();       break;
-		case cMonster::mtOcelot:       Monster = new cOcelot();          break;
-		case cMonster::mtPig:          Monster = new cPig();             break;
-		case cMonster::mtSheep:        Monster = new cSheep(ShColor);    break;
-		case cMonster::mtSilverfish:   Monster = new cSilverfish();      break;
-		case cMonster::mtSkeleton:     Monster = new cSkeleton(SkType);  break;
-		case cMonster::mtSlime:        Monster = new cSlime(SlSize);     break;
-		case cMonster::mtSnowGolem:    Monster = new cSnowGolem();       break;
-		case cMonster::mtSpider:       Monster = new cSpider();          break;
-		case cMonster::mtSquid:        Monster = new cSquid();           break;
-		case cMonster::mtVillager:
-		{
-			Monster = new cVillager((cVillager::eVillagerType)VilType);  break;
-		}
-		case cMonster::mtWitch:        Monster = new cWitch();           break;
-		case cMonster::mtWither:       Monster = new cWither();          break;
-		case cMonster::mtWolf:         Monster = new cWolf();            break;
-		case cMonster::mtZombie:       Monster = new cZombie(false);     break; // TODO: Villager infection
-		case cMonster::mtZombiePigman: Monster = new cZombiePigman();    break;
-		
-		default:
-		{
-			LOGWARNING("%s: Unhandled monster type: %d. Not spawning.", __FUNCTION__, a_MonsterType);
-			return -1;
-		}
-	}
-	Monster->SetPosition(a_PosX, a_PosY, a_PosZ);
-	Monster->SetHealth(Monster->GetMaxHealth());
-	if (cPluginManager::Get()->CallHookSpawningMonster(*this, *Monster))
+
+
+
+int cWorld::SpawnMobFinalize(cMonster* a_Monster)
+{
+	if (!a_Monster)
+		return -1;
+	a_Monster->SetHealth(a_Monster->GetMaxHealth());
+	if (cPluginManager::Get()->CallHookSpawningMonster(*this, *a_Monster))
 	{
-		delete Monster;
+		delete a_Monster;
 		return -1;
 	}
-	if (!Monster->Initialize(this))
+	if (!a_Monster->Initialize(this))
 	{
-		delete Monster;
+		delete a_Monster;
 		return -1;
 	}
+	BroadcastSpawnEntity(*a_Monster);
+	cPluginManager::Get()->CallHookSpawnedMonster(*this, *a_Monster);
 
-	BroadcastSpawnEntity(*Monster);
-	// Because it's logical that ALL mob spawns need spawn effects, not just spawners
-	BroadcastSoundParticleEffect(2004, (int)(floor(a_PosX) * 8), (int)(floor(a_PosY) * 8), (int)(floor(a_PosZ) * 8), 0);
-
-	cPluginManager::Get()->CallHookSpawnedMonster(*this, *Monster);
-	return Monster->GetUniqueID();
+	return a_Monster->GetUniqueID();
 }
 
 
diff --git a/source/World.h b/source/World.h
index 25bc0b338..a91007b17 100644
--- a/source/World.h
+++ b/source/World.h
@@ -42,6 +42,7 @@ class cChunkGenerator;  // The thread responsible for generating chunks
 class cChestEntity;

 class cDispenserEntity;

 class cFurnaceEntity;

+class cMobCensus;

 

 typedef std::list< cPlayer * > cPlayerList;

 

@@ -580,6 +581,7 @@ public:
 	

 	/// Spawns a mob of the specified type. Returns the mob's EntityID if recognized and spawned, <0 otherwise

 	int SpawnMob(double a_PosX, double a_PosY, double a_PosZ, cMonster::eType a_MonsterType);  // tolua_export

+	int SpawnMobFinalize(cMonster* a_Monster);

 	

 	/// Creates a projectile of the specified type. Returns the projectile's EntityID if successful, <0 otherwise

 	int CreateProjectile(double a_PosX, double a_PosY, double a_PosZ, cProjectileEntity::eKind a_Kind, cEntity * a_Creator, const Vector3d * a_Speed = NULL);  // tolua_export

@@ -632,7 +634,7 @@ private:
 	Int64  m_LastTimeUpdate;    // The tick in which the last time update has been sent.

 	Int64  m_LastUnload;        // The last WorldAge (in ticks) in which unloading was triggerred

 	Int64  m_LastSave;          // The last WorldAge (in ticks) in which save-all was triggerred

-	Int64  m_LastSpawnMonster;  // The last WorldAge (in ticks) in which a monster was spawned

+	std::map<cMonster::eFamily,Int64> m_LastSpawnMonster; // The last WorldAge (in ticks) in which a monster was spawned (for each megatype of monster) // MG TODO : find a way to optimize without creating unmaintenability (if mob IDs are becoming unrowed)

 

 	eGameMode m_GameMode;

 	bool m_bEnabledPVP;

@@ -662,7 +664,7 @@ private:
 	cChunkMap * m_ChunkMap;

 

 	bool m_bAnimals;

-	Int64 m_SpawnMonsterRate;

+	std::set<cMonster::eType> m_AllowedMobs;

 

 	eWeather m_Weather;

 	int m_WeatherInterval;

@@ -717,8 +719,8 @@ private:
 	/// Handles the weather in each tick

 	void TickWeather(float a_Dt);

 	

-	/// Handles the mob spawning each tick

-	void TickSpawnMobs(float a_Dt);

+	/// Handles the mob spawning/moving/destroying each tick

+	void TickMobs(float a_Dt);

 	

 	/// Executes all tasks queued onto the tick thread

 	void TickQueuedTasks(void);