7 files changed, 891 insertions, 63 deletions

diff --git a/src/Generating/NetherFortGen.cpp b/src/Generating/NetherFortGen.cpp
index b6ec46986..d90fdeb0a 100644
--- a/src/Generating/NetherFortGen.cpp
+++ b/src/Generating/NetherFortGen.cpp
@@ -71,6 +71,40 @@ public:
 
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Performance test of the NetherFort generator:
+
+/*
+#include "OSSupport/Timer.h"
+static class cNetherFortPerfTest
+{
+public:
+	cNetherFortPerfTest(void)
+	{
+		cTimer Timer;
+		long long StartTime = Timer.GetNowTime();
+		
+		const int GridSize = 512;
+		const int MaxDepth = 12;
+		const int NumIterations = 100;
+		for (int i = 0; i < NumIterations; i++)
+		{
+			cNetherFortGen FortGen(i, GridSize, MaxDepth);
+			delete new cNetherFortGen::cNetherFort(FortGen, 0, 0, GridSize, MaxDepth, i);
+		}
+		
+		long long EndTime = Timer.GetNowTime();
+		printf("%d forts took %lld msec (%f sec) to generate\n", NumIterations, EndTime - StartTime, ((double)(EndTime - StartTime)) / 1000);
+		exit(0);
+	}
+	
+} g_PerfTest;
+//*/
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cNetherFortGen:
 
 cNetherFortGen::cNetherFortGen(int a_Seed, int a_GridSize, int a_MaxDepth) :
@@ -258,6 +292,15 @@ cPieces cNetherFortGen::GetStartingPieces(void)
 
 
 
+int cNetherFortGen::GetPieceWeight(const cPlacedPiece & a_PlacedPiece, const cPiece::cConnector & a_ExistingConnector, const cPiece & a_NewPiece)
+{
+	return ((const cPrefab &)a_NewPiece).GetPieceWeight(a_PlacedPiece, a_ExistingConnector);
+}
+
+
+
+
+
 void cNetherFortGen::PiecePlaced(const cPiece & a_Piece)
 {
 	UNUSED(a_Piece);
diff --git a/src/Generating/NetherFortGen.h b/src/Generating/NetherFortGen.h
index 10ba01396..d51596b9e 100644
--- a/src/Generating/NetherFortGen.h
+++ b/src/Generating/NetherFortGen.h
@@ -26,6 +26,7 @@ public:
 	virtual ~cNetherFortGen();
 	
 protected:
+	friend class cNetherFortPerfTest;  // fwd: NetherFortGen.cpp
 	class cNetherFort;  // fwd: NetherFortGen.cpp
 	typedef std::list<cNetherFort *> cNetherForts;
 	
@@ -77,6 +78,7 @@ protected:
 	// cPiecePool overrides:
 	virtual cPieces GetPiecesWithConnector(int a_ConnectorType) override;
 	virtual cPieces GetStartingPieces(void) override;
+	virtual int GetPieceWeight(const cPlacedPiece & a_PlacedPiece, const cPiece::cConnector & a_ExistingConnector, const cPiece & a_NewPiece) override;
 	virtual void PiecePlaced(const cPiece & a_Piece) override;
 	virtual void Reset(void) override;
 } ;
diff --git a/src/Generating/PieceGenerator.cpp b/src/Generating/PieceGenerator.cpp
index 8999a5ff7..8e9a48be6 100644
--- a/src/Generating/PieceGenerator.cpp
+++ b/src/Generating/PieceGenerator.cpp
@@ -392,14 +392,17 @@ bool cPieceGenerator::TryPlacePieceAtConnector(
 	Connections.reserve(AvailablePieces.size());
 	Vector3i ConnPos = a_Connector.m_Pos;  // The position at which the new connector should be placed - 1 block away from the connector
 	AddFaceDirection(ConnPos.x, ConnPos.y, ConnPos.z, a_Connector.m_Direction);
-	
-	/*
-	// DEBUG:
-	printf("Placing piece at connector pos {%d, %d, %d}, direction %s\n", ConnPos.x, ConnPos.y, ConnPos.z, BlockFaceToString(a_Connector.m_Direction).c_str());
-	//*/
-	
+	int WeightTotal = 0;
 	for (cPieces::iterator itrP = AvailablePieces.begin(), endP = AvailablePieces.end(); itrP != endP; ++itrP)
 	{
+		// Get the relative chance of this piece being generated in this path:
+		int Weight = m_PiecePool.GetPieceWeight(a_ParentPiece, a_Connector, **itrP);
+		if (Weight <= 0)
+		{
+			continue;
+		}
+		
+		// Try fitting each of the piece's connector:
 		cPiece::cConnectors Connectors = (*itrP)->GetConnectors();
 		for (cPiece::cConnectors::iterator itrC = Connectors.begin(), endC = Connectors.end(); itrC != endC; ++itrC)
 		{
@@ -419,7 +422,9 @@ bool cPieceGenerator::TryPlacePieceAtConnector(
 				// Doesn't fit in this rotation
 				continue;
 			}
-			Connections.push_back(cConnection(**itrP, *itrC, NumCCWRotations));
+			// Fits, add it to list of possibile connections:
+			Connections.push_back(cConnection(**itrP, *itrC, NumCCWRotations, Weight));
+			WeightTotal += Weight;
 		}  // for itrC - Connectors[]
 	}  // for itrP - AvailablePieces[]
 	if (Connections.empty())
@@ -427,21 +432,23 @@ bool cPieceGenerator::TryPlacePieceAtConnector(
 		// No available connections, bail out
 		return false;
 	}
+	ASSERT(WeightTotal > 0);
 	
-	// Choose a random connection from the list:
-	int rnd = m_Noise.IntNoise3DInt(a_Connector.m_Pos.x, a_Connector.m_Pos.y, a_Connector.m_Pos.z) / 7;
-	cConnection & Conn = Connections[rnd % Connections.size()];
+	// Choose a random connection from the list, based on the weights:
+	int rnd = (m_Noise.IntNoise3DInt(a_Connector.m_Pos.x, a_Connector.m_Pos.y, a_Connector.m_Pos.z) / 7) % WeightTotal;
+	size_t ChosenIndex = 0;
+	for (cConnections::const_iterator itr = Connections.begin(), end = Connections.end(); itr != end; ++itr, ++ChosenIndex)
+	{
+		rnd -= itr->m_Weight;
+		if (rnd <= 0)
+		{
+			// This is the piece to choose
+			break;
+		}
+	}
+	cConnection & Conn = Connections[ChosenIndex];
 	
 	// Place the piece:
-	/*
-	// DEBUG
-	printf("Chosen connector at {%d, %d, %d}, direction %s, needs %d rotations\n",
-		Conn.m_Connector.m_Pos.x, Conn.m_Connector.m_Pos.y, Conn.m_Connector.m_Pos.z,
-		BlockFaceToString(Conn.m_Connector.m_Direction).c_str(),
-		Conn.m_NumCCWRotations
-	);
-	//*/
-	
 	Vector3i NewPos = Conn.m_Piece->RotatePos(Conn.m_Connector.m_Pos, Conn.m_NumCCWRotations);
 	ConnPos -= NewPos;
 	cPlacedPiece * PlacedPiece = new cPlacedPiece(&a_ParentPiece, *(Conn.m_Piece), ConnPos, Conn.m_NumCCWRotations);
@@ -449,12 +456,6 @@ bool cPieceGenerator::TryPlacePieceAtConnector(
 	
 	// Add the new piece's connectors to the list of free connectors:
 	cPiece::cConnectors Connectors = Conn.m_Piece->GetConnectors();
-	
-	/*
-	// DEBUG:
-	printf("Adding %u connectors to the pool\n", Connectors.size() - 1);
-	//*/
-	
 	for (cPiece::cConnectors::const_iterator itr = Connectors.begin(), end = Connectors.end(); itr != end; ++itr)
 	{
 		if (itr->m_Pos.Equals(Conn.m_Connector.m_Pos))
@@ -524,10 +525,11 @@ void cPieceGenerator::DebugConnectorPool(const cPieceGenerator::cFreeConnectors
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cPieceGenerator::cConnection:
 
-cPieceGenerator::cConnection::cConnection(cPiece & a_Piece, cPiece::cConnector & a_Connector, int a_NumCCWRotations) :
+cPieceGenerator::cConnection::cConnection(cPiece & a_Piece, cPiece::cConnector & a_Connector, int a_NumCCWRotations, int a_Weight) :
 	m_Piece(&a_Piece),
 	m_Connector(a_Connector),
-	m_NumCCWRotations(a_NumCCWRotations)
+	m_NumCCWRotations(a_NumCCWRotations),
+	m_Weight(a_Weight)
 {
 }
 
diff --git a/src/Generating/PieceGenerator.h b/src/Generating/PieceGenerator.h
index bef9d3463..f4433b947 100644
--- a/src/Generating/PieceGenerator.h
+++ b/src/Generating/PieceGenerator.h
@@ -85,6 +85,13 @@ typedef std::vector<cPiece *> cPieces;
 
 
 
+// fwd:
+class cPlacedPiece;
+
+
+
+
+
 /** This class is an interface that provides pieces for the generator. It can keep track of what pieces were
 placed and adjust the returned piece vectors. */
 class cPiecePool
@@ -101,6 +108,16 @@ public:
 	Multiple starting points are supported, one of the returned piece will be chosen. */
 	virtual cPieces GetStartingPieces(void) = 0;
 	
+	/** Returns the relative weight with which the a_NewPiece is to be selected for placing under a_PlacedPiece through a_ExistingConnector.
+	This allows the pool to tweak the piece's chances, based on the previous pieces in the tree and the connector used.
+	The higher the number returned, the higher the chance the piece will be chosen. 0 means the piece will never be chosen.
+	*/
+	virtual int GetPieceWeight(
+		const cPlacedPiece & a_PlacedPiece,
+		const cPiece::cConnector & a_ExistingConnector,
+		const cPiece & a_NewPiece
+	) { return 1; }
+	
 	/** Called after a piece is placed, to notify the pool that it has been used.
 	The pool may adjust the pieces it will return the next time. */
 	virtual void PiecePlaced(const cPiece & a_Piece) = 0;
@@ -157,8 +174,9 @@ protected:
 		cPiece * m_Piece;                  // The piece being connected
 		cPiece::cConnector m_Connector;    // The piece's connector being used (relative non-rotated coords)
 		int m_NumCCWRotations;             // Number of rotations necessary to match the two connectors
+		int m_Weight;                      // Relative chance that this connection will be chosen
 		
-		cConnection(cPiece & a_Piece, cPiece::cConnector & a_Connector, int a_NumCCWRotations);
+		cConnection(cPiece & a_Piece, cPiece::cConnector & a_Connector, int a_NumCCWRotations, int a_Weight);
 	};
 	typedef std::vector<cConnection> cConnections;
 	
diff --git a/src/Generating/Prefab.cpp b/src/Generating/Prefab.cpp
index 131b6acb2..7d1762036 100644
--- a/src/Generating/Prefab.cpp
+++ b/src/Generating/Prefab.cpp
@@ -91,7 +91,19 @@ static const cPrefab::sDef g_TestPrefabDef =
 	7,  /* 1, 2, 3 CCW rotations */
 	
 	// Merge strategy:
-	cBlockArea::msImprint
+	cBlockArea::msImprint,
+	
+	// ShouldExtendFloor:
+	false,
+
+	// DefaultWeight:
+	10,
+
+	// DepthWeight:
+	"",
+
+	// AddWeightIfSame:
+	1000,
 };
 
 static cPrefab g_TestPrefab(g_TestPrefabDef);
@@ -105,13 +117,17 @@ cPrefab::cPrefab(const cPrefab::sDef & a_Def) :
 	m_Size(a_Def.m_SizeX, a_Def.m_SizeY, a_Def.m_SizeZ),
 	m_HitBox(0, 0, 0, a_Def.m_SizeX - 1, a_Def.m_SizeY - 1, a_Def.m_SizeZ - 1),
 	m_AllowedRotations(a_Def.m_AllowedRotations),
-	m_MergeStrategy(a_Def.m_MergeStrategy)
+	m_MergeStrategy(a_Def.m_MergeStrategy),
+	m_ShouldExtendFloor(a_Def.m_ShouldExtendFloor),
+	m_DefaultWeight(a_Def.m_DefaultWeight),
+	m_AddWeightIfSame(a_Def.m_AddWeightIfSame)
 {
 	m_BlockArea[0].Create(m_Size);
 	CharMap cm;
 	ParseCharMap(cm, a_Def.m_CharMap);
 	ParseBlockImage(cm, a_Def.m_Image);
 	ParseConnectors(a_Def.m_Connectors);
+	ParseDepthWeight(a_Def.m_DepthWeight);
 	
 	// 1 CCW rotation:
 	if ((m_AllowedRotations & 0x01) != 0)
@@ -142,12 +158,53 @@ cPrefab::cPrefab(const cPrefab::sDef & a_Def) :
 
 void cPrefab::Draw(cChunkDesc & a_Dest, const cPlacedPiece * a_Placement) const
 {
+	// Draw the basic image:
 	Vector3i Placement = a_Placement->GetCoords();
 	int ChunkStartX = a_Dest.GetChunkX() * cChunkDef::Width;
 	int ChunkStartZ = a_Dest.GetChunkZ() * cChunkDef::Width;
 	Placement.Move(-ChunkStartX, 0, -ChunkStartZ);
-	a_Dest.WriteBlockArea(m_BlockArea[a_Placement->GetNumCCWRotations()], Placement.x, Placement.y, Placement.z, m_MergeStrategy);
+	const cBlockArea & Image = m_BlockArea[a_Placement->GetNumCCWRotations()];
+	a_Dest.WriteBlockArea(Image, Placement.x, Placement.y, Placement.z, m_MergeStrategy);
 	
+	// If requested, draw the floor (from the bottom of the prefab down to the nearest non-air)
+	int MaxX = Image.GetSizeX();
+	int MaxZ = Image.GetSizeZ();
+	for (int z = 0; z < MaxZ; z++)
+	{
+		int RelZ = Placement.z + z;
+		if ((RelZ < 0) || (RelZ >= cChunkDef::Width))
+		{
+			// Z coord outside the chunk
+			continue;
+		}
+		for (int x = 0; x < MaxX; x++)
+		{
+			int RelX = Placement.x + x;
+			if ((RelX < 0) || (RelX >= cChunkDef::Width))
+			{
+				// X coord outside the chunk
+				continue;
+			}
+			BLOCKTYPE BlockType;
+			NIBBLETYPE BlockMeta;
+			Image.GetRelBlockTypeMeta(x, 0, z, BlockType, BlockMeta);
+			if ((BlockType == E_BLOCK_AIR) || (BlockType == E_BLOCK_SPONGE))
+			{
+				// Do not expand air nor sponge blocks
+				continue;
+			}
+			for (int y = Placement.y - 1; y >= 0; y--)
+			{
+				BLOCKTYPE ExistingBlock = a_Dest.GetBlockType(RelX, y, RelZ);
+				if (ExistingBlock != E_BLOCK_AIR)
+				{
+					// End the expansion for this column, reached the end
+					break;
+				}
+				a_Dest.SetBlockTypeMeta(RelX, y, RelZ, BlockType, BlockMeta);
+			}  // for y
+		}  // for x
+	}  // for z
 }
 
 
@@ -170,6 +227,26 @@ bool cPrefab::HasConnectorType(int a_ConnectorType) const
 
 
 
+int cPrefab::GetPieceWeight(const cPlacedPiece & a_PlacedPiece, const cPiece::cConnector & a_ExistingConnector) const
+{
+	// Use the default or per-depth weight:
+	cDepthWeight::const_iterator itr = m_DepthWeight.find(a_PlacedPiece.GetDepth() + 1);
+	int res = (itr == m_DepthWeight.end()) ? m_DefaultWeight : itr->second;
+	
+	// If the piece is the same as the parent, apply the m_AddWeightIfSame modifier:
+	const cPiece * ParentPiece = &a_PlacedPiece.GetPiece();
+	const cPiece * ThisPiece = this;
+	if (ThisPiece == ParentPiece)
+	{
+		res += m_AddWeightIfSame;
+	}
+	return res;
+}
+
+
+
+
+
 void cPrefab::ParseCharMap(CharMap & a_CharMapOut, const char * a_CharMapDef)
 {
 	ASSERT(a_CharMapDef != NULL);
@@ -277,6 +354,54 @@ void cPrefab::ParseConnectors(const char * a_ConnectorsDef)
 
 
 
+void cPrefab::ParseDepthWeight(const char * a_DepthWeightDef)
+{
+	// The member needn't be defined at all, if so, skip:
+	if (a_DepthWeightDef == NULL)
+	{
+		return;
+	}
+	
+	// Split into individual records: "Record | Record | Record"
+	AStringVector Defs = StringSplitAndTrim(a_DepthWeightDef, "|");
+	
+	// Add each record's contents:
+	for (AStringVector::const_iterator itr = Defs.begin(), end = Defs.end(); itr != end; ++itr)
+	{
+		// Split into components: "Depth : Weight"
+		AStringVector Components = StringSplitAndTrim(*itr, ":");
+		if (Components.size() != 2)
+		{
+			LOGWARNING("Bad prefab DepthWeight record: \"%s\", skipping.", itr->c_str());
+			continue;
+		}
+		
+		// Parse depth:
+		int Depth = atoi(Components[0].c_str());
+		if ((Depth == 0) && (Components[0] != "0"))
+		{
+			LOGWARNING("Bad prefab DepthWeight record, cannot parse depth \"%s\", skipping.", Components[0].c_str());
+			continue;
+		}
+		
+		// Parse weight:
+		int Weight = atoi(Components[1].c_str());
+		if ((Weight == 0) && (Components[1] != "0"))
+		{
+			LOGWARNING("Bad prefab DepthWeight record, cannot parse weight \"%s\", skipping.", Components[1].c_str());
+			continue;
+		}
+		
+		// Save to map:
+		ASSERT(m_DepthWeight.find(Depth) == m_DepthWeight.end());  // Not a duplicate
+		m_DepthWeight[Depth] = Weight;
+	}  // for itr - Defs[]
+}
+
+
+
+
+
 cPiece::cConnectors cPrefab::GetConnectors(void) const
 {
 	return m_Connectors;
diff --git a/src/Generating/Prefab.h b/src/Generating/Prefab.h
index 04c4f09da..dbf882e21 100644
--- a/src/Generating/Prefab.h
+++ b/src/Generating/Prefab.h
@@ -37,11 +37,47 @@ public:
 		int m_SizeX;
 		int m_SizeY;
 		int m_SizeZ;
+		
+		/** The mapping between characters in m_Image and the blocktype / blockmeta.
+		Format: "Char: BlockType: BlockMeta \n Char: BlockType : BlockMeta \n ..." */
 		const char * m_CharMap;
+		
+		/** The actual image to be used for the prefab. Organized YZX (Y changes the least often).
+		Each character represents a single block, the type is mapped through m_CharMap. */
 		const char * m_Image;
+		
+		/** List of connectors.
+		Format: "Type: X, Y, Z : Direction \n Type : X, Y, Z : Direction \n ...".
+		Type is an arbitrary number, Direction is the BlockFace constant value (0 .. 5). */
 		const char * m_Connectors;
+		
+		/** Bitmask specifying the allowed rotations.
+		N rotations CCW are allowed if bit N is set. */
 		int m_AllowedRotations;
+		
+		/** The merge strategy to use while drawing the prefab. */
 		cBlockArea::eMergeStrategy m_MergeStrategy;
+		
+		/** If set to true, the prefab will extend its lowermost blocks until a solid block is found,
+		thus creating a foundation for the prefab. This is used for houses to be "on the ground", as well as
+		nether fortresses not to float. */
+		bool m_ShouldExtendFloor;
+
+		/** Chance of this piece being used, if no other modifier is active. */
+		int m_DefaultWeight;
+		
+		/** Chances of this piece being used, per depth of the generated piece tree.
+		The starting piece has a depth of 0, the pieces connected to it are depth 1, etc.
+		The specified depth stands for the depth of the new piece (not the existing already-placed piece),
+		so valid depths start at 1.
+		Format: "Depth : Weight | Depth : Weight | Depth : Weight ..."
+		Depths that are not specified will use the m_DefaultWeight value. */
+		const char * m_DepthWeight;
+		
+		/** The weight to add to this piece's base per-depth chance if the previous piece is the same.
+		Can be positive or negative.
+		This is used e. g. to make nether bridges prefer spanning multiple segments or to penalize turrets next to each other. */
+		int m_AddWeightIfSame;
 	};
 	
 	cPrefab(const sDef & a_Def);
@@ -51,6 +87,10 @@ public:
 	
 	/** Returns true if the prefab has any connector of the specified type. */
 	bool HasConnectorType(int a_ConnectorType) const;
+	
+	/** Returns the weight (chance) of this prefab generating as the next piece after the specified placed piece.
+	PiecePool implementations can use this for their GetPieceWeight() implementations. */
+	int GetPieceWeight(const cPlacedPiece & a_PlacedPiece, const cPiece::cConnector & a_ExistingConnector) const;
 
 protected:
 	/** Packs complete definition of a single block, for per-letter assignment. */
@@ -60,9 +100,12 @@ protected:
 		NIBBLETYPE m_BlockMeta;
 	};
 	
-	/** Maps letters in the sDef::m_Image onto a number, BlockType * 16 | BlockMeta */
+	/** Maps letters in the sDef::m_Image onto a sBlockTypeDef block type definition. */
 	typedef sBlockTypeDef CharMap[256];
 	
+	/** Maps generator tree depth to weight. */
+	typedef std::map<int, int> cDepthWeight;
+	
 	
 	/** The cBlockArea that contains the block definitions for the prefab.
 	The index identifies the number of CCW rotations applied (0 = no rotation, 1 = 1 CCW rotation, ...). */
@@ -82,6 +125,26 @@ protected:
 	
 	/** The merge strategy to use when drawing the prefab into a block area */
 	cBlockArea::eMergeStrategy m_MergeStrategy;
+
+	/** If set to true, the prefab will extend its lowermost blocks until a solid block is found,
+	thus creating a foundation for the prefab. This is used for houses to be "on the ground", as well as
+	nether fortresses not to float. */
+	bool m_ShouldExtendFloor;
+
+	/** Chance of this piece being used, if no other modifier is active. */
+	int m_DefaultWeight;
+	
+	/** Chances of this piece being used, per depth of the generated piece tree.
+	The starting piece has a depth of 0, the pieces connected to it are depth 1, etc.
+	The specified depth stands for the depth of the new piece (not the existing already-placed piece),
+	so valid depths start at 1.
+	Depths that are not specified will use the m_DefaultWeight value. */
+	cDepthWeight m_DepthWeight;
+	
+	/** The weight to add to this piece's base per-depth chance if the previous piece is the same.
+	Can be positive or negative.
+	This is used e. g. to make nether bridges prefer spanning multiple segments or to penalize turrets next to each other. */
+	int m_AddWeightIfSame;
 	
 	
 	// cPiece overrides:	
@@ -98,6 +161,9 @@ protected:
 	
 	/** Parses the connectors definition text into m_Connectors member. */
 	void ParseConnectors(const char * a_ConnectorsDef);
+	
+	/** Parses the per-depth weight into m_DepthWeight member. */
+	void ParseDepthWeight(const char * a_DepthWeightDef);
 };
 
 
diff --git a/src/Generating/Prefabs/NetherFortPrefabs.cpp b/src/Generating/Prefabs/NetherFortPrefabs.cpp
index 29b35a5a4..7a46df5d8 100644
--- a/src/Generating/Prefabs/NetherFortPrefabs.cpp
+++ b/src/Generating/Prefabs/NetherFortPrefabs.cpp
@@ -133,10 +133,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 2, 2: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		20,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BalconyCorridor
 
 
@@ -274,10 +286,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 2, 4: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		20,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BalconyTee2
 
 
@@ -378,10 +402,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 0, 1, 3: 4\n"  /* Type 0, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BlazePlatform
 
 
@@ -510,10 +546,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 0, 5, 3: 4\n"  /* Type 0, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BlazePlatformOverhang
 
 
@@ -694,10 +742,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 7, 5, 14: 3\n"  /* Type 0, direction Z+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		5,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeCircleCrossing
 
 
@@ -879,10 +939,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 14, 5, 7: 5\n"  /* Type 0, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		10,
+
+		// DepthWeight:
+		"1:1000",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeCrossing
 
 
@@ -957,10 +1029,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 0, 5, 2: 4\n"  /* Type 0, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"1:0",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeCrumble1
 
 
@@ -1041,10 +1125,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 5, 2: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"1:0",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeCrumble2
 
 
@@ -1204,15 +1300,263 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 2, 4, 15: 3\n"  /* Type 0, direction Z+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		10,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		1000,
 	},  // BridgeDoubleCrumble
 
 
 
 	///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// BridgeFunnelDown:
+	// The data has been exported from the gallery Nether, area index 0, ID 2, created by Aloe_vera
+	{
+		// Size:
+		15, 12, 12,  // SizeX = 15, SizeY = 12, SizeZ = 12
+
+		// Block definitions:
+		".:  0: 0\n"  /* air */
+		"a:112: 0\n"  /* netherbrick */
+		"b:114: 6\n"  /* netherbrickstairs */
+		"c:114: 4\n"  /* netherbrickstairs */
+		"d:114: 5\n"  /* netherbrickstairs */
+		"e: 44:14\n"  /* step */
+		"f:114: 7\n"  /* netherbrickstairs */
+		"m: 19: 0\n"  /* sponge */,
+
+		// Block data:
+		// Level 0
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aammmmmmmmmmmaa"
+		/*  2 */ "aammmmmmmmmmmaa"
+		/*  3 */ "aammmmmmmmmmmaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmmmmmmmmmmm"
+		/*  8 */ "mmmmmmmmmmmmmmm"
+		/*  9 */ "mmmmmmaaammmmmm"
+		/* 10 */ "mmmmmmaaammmmmm"
+		/* 11 */ "mmmmmmaaammmmmm"
+
+		// Level 1
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aammmmmmmmmmmaa"
+		/*  2 */ "aammmmmmmmmmmaa"
+		/*  3 */ "aammmmmmmmmmmaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmmmmmmmmmmm"
+		/*  8 */ "mmmmmmbbbmmmmmm"
+		/*  9 */ "mmmmmmaaammmmmm"
+		/* 10 */ "mmmmmmaaammmmmm"
+		/* 11 */ "mmmmmmaaammmmmm"
+
+		// Level 2
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aammmmmmmmmmmaa"
+		/*  2 */ "aammmmmmmmmmmaa"
+		/*  3 */ "aammmmmmmmmmmaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmcbbbdmmmmm"
+		/*  8 */ "mmmmmcaaadmmmmm"
+		/*  9 */ "mmmmmcaaadmmmmm"
+		/* 10 */ "mmmmmcaaadmmmmm"
+		/* 11 */ "mmmmmcaaadmmmmm"
+
+		// Level 3
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aammmmmmmmmmmaa"
+		/*  2 */ "aammmmmmmmmmmaa"
+		/*  3 */ "aammmmmmmmmmmaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmaaaaammmmm"
+		/*  8 */ "mmmmmaaaaammmmm"
+		/*  9 */ "mmmmmaaaaammmmm"
+		/* 10 */ "mmmmmaaaaammmmm"
+		/* 11 */ "mmmmmaaaaammmmm"
+
+		// Level 4
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aammmmmmmmmmmaa"
+		/*  2 */ "aammmmmmmmmmmaa"
+		/*  3 */ "aammmmmmmmmmmaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmcbbbbbdmmmm"
+		/*  7 */ "mmmmaaaaaaammmm"
+		/*  8 */ "mmmma.....ammmm"
+		/*  9 */ "mmmmaa...aammmm"
+		/* 10 */ "mmmmma...ammmmm"
+		/* 11 */ "mmmmma...ammmmm"
+
+		// Level 5
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aadmmmmmmmmmcaa"
+		/*  2 */ "aadmmmmmmmmmcaa"
+		/*  3 */ "aadmmmmmmmmmcaa"
+		/*  4 */ "mmmmmmmmmmmmmmm"
+		/*  5 */ "mmmcbbbbbbbdmmm"
+		/*  6 */ "mmmaaaaaaaaaamm"
+		/*  7 */ "mmma.......ammm"
+		/*  8 */ "mmmaa.....aammm"
+		/*  9 */ "mmmmam...mammmm"
+		/* 10 */ "mmmmmm...mmmmmm"
+		/* 11 */ "mmmmmm...mmmmmm"
+
+		// Level 6
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "aaademmmmmecaaa"
+		/*  2 */ "aaademmmmmecaaa"
+		/*  3 */ "aaademmmmmecaaa"
+		/*  4 */ "mmaaabbbbbaaaam"
+		/*  5 */ "mmaaaaaaaaaaaam"
+		/*  6 */ "mma.........amm"
+		/*  7 */ "mmaa.......aamm"
+		/*  8 */ "mmmam.....mammm"
+		/*  9 */ "mmmmmm...mmmmmm"
+		/* 10 */ "mmmmmm...mmmmmm"
+		/* 11 */ "mmmmmm...mmmmmm"
+
+		// Level 7
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "bbbbbbbbbbbbbbb"
+		/*  1 */ "aaaaaaaaaaaaaaa"
+		/*  2 */ "aaaaaaaaaaaaaaa"
+		/*  3 */ "aaaaaaaaaaaaaaa"
+		/*  4 */ "faaaaaaaaaaaaaa"
+		/*  5 */ "ma...........am"
+		/*  6 */ "maa.........aam"
+		/*  7 */ "mmam.......mamm"
+		/*  8 */ "mmmmm.....mmmmm"
+		/*  9 */ "mmmmmmmmmmmmmmm"
+		/* 10 */ "mmmmmmmmmmmmmmm"
+		/* 11 */ "mmmmmmmmmmmmmmm"
+
+		// Level 8
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "aaaaaaaaaaaaaaa"
+		/*  1 */ "aaaaaaaaaaaaaaa"
+		/*  2 */ "aaaaaaaaaaaaaaa"
+		/*  3 */ "aaaaaaaaaaaaaaa"
+		/*  4 */ "a.............a"
+		/*  5 */ "aa...........aa"
+		/*  6 */ "mam.........mam"
+		/*  7 */ "mmmm.......mmmm"
+		/*  8 */ "mmmmmmmmmmmmmmm"
+		/*  9 */ "mmmmmmmmmmmmmmm"
+		/* 10 */ "mmmmmmmmmmmmmmm"
+		/* 11 */ "mmmmmmmmmmmmmmm"
+
+		// Level 9
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "aaaaaaaaaaaaaaa"
+		/*  1 */ "..............."
+		/*  2 */ "..............."
+		/*  3 */ "..............."
+		/*  4 */ "a.............a"
+		/*  5 */ "am............a"
+		/*  6 */ "mmm.........mmm"
+		/*  7 */ "mmmmmmmmmmmmmmm"
+		/*  8 */ "mmmmmmmmmmmmmmm"
+		/*  9 */ "mmmmmmmmmmmmmmm"
+		/* 10 */ "mmmmmmmmmmmmmmm"
+		/* 11 */ "mmmmmmmmmmmmmmm"
+
+		// Level 10
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "..............."
+		/*  2 */ "..............."
+		/*  3 */ "..............."
+		/*  4 */ "m.............m"
+		/*  5 */ "mm............m"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmmmmmmmmmmm"
+		/*  8 */ "mmmmmmmmmmmmmmm"
+		/*  9 */ "mmmmmmmmmmmmmmm"
+		/* 10 */ "mmmmmmmmmmmmmmm"
+		/* 11 */ "mmmmmmmmmmmmmmm"
+
+		// Level 11
+		/* z\x*             11111 */
+		/*    *   012345678901234 */
+		/*  0 */ "mmmmmmmmmmmmmmm"
+		/*  1 */ "..............."
+		/*  2 */ "..............."
+		/*  3 */ "..............."
+		/*  4 */ "m.............m"
+		/*  5 */ "mmmmmmmmmmmmmmm"
+		/*  6 */ "mmmmmmmmmmmmmmm"
+		/*  7 */ "mmmmmmmmmmmmmmm"
+		/*  8 */ "mmmmmmmmmmmmmmm"
+		/*  9 */ "mmmmmmmmmmmmmmm"
+		/* 10 */ "mmmmmmmmmmmmmmm"
+		/* 11 */ "mmmmmmmmmmmmmmm",
+
+		// Connectors:
+		"0: 7, 4, 11: 3\n"  /* Type 0, direction Z+ */
+		"0: 0, 9, 2: 4\n"  /* Type 0, direction X- */
+		"0: 14, 9, 2: 5\n"  /* Type 0, direction X+ */,
+
+		// AllowedRotations:
+		7,  /* 1, 2, 3 CCW rotation allowed */
+
+		// Merge strategy:
+		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		5,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
+	},  // BridgeFunnelDown
+
+
+
+	///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 	// BridgeLevelCrossing:
 	// The data has been exported from the gallery Nether, area index 45, ID 304, created by Aloe_vera
 	{
@@ -1514,10 +1858,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"",
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeLevelCrossing
 
 
@@ -1617,10 +1973,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 14, 5, 2: 5\n"  /* Type 0, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		500,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		1000,
 	},  // BridgeSegment
 
 
@@ -1761,10 +2129,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 14, 5, 2: 5\n"  /* Type 0, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		10,
+
+		// DepthWeight:
+		"1:500",
+
+		// AddWeightIfSame:
+		0,
 	},  // BridgeTee
 
 
@@ -1844,10 +2224,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 1, 2: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		200,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // Corridor11
 
 
@@ -1927,10 +2319,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 1, 2: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		200,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // Corridor13
 
 
@@ -2048,10 +2452,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 10, 1, 2: 5\n"  /* Type 1, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // CorridorCorner5
 
 
@@ -2170,10 +2586,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 2, 1, 10: 3\n"  /* Type 1, direction Z+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // CorridorCornerChest5
 
 
@@ -2304,10 +2732,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 8, 8, 2: 5\n"  /* Type 1, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // CorridorStairs
 
 
@@ -2367,11 +2807,11 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		// Level 4
 		/* z\x*             1111 */
 		/*    *   01234567890123 */
-		/*  0 */ "aaaaaaaaaaaaaa"
+		/*  0 */ "aabaaaaaaaabaa"
 		/*  1 */ ".............."
 		/*  2 */ ".............."
 		/*  3 */ ".............."
-		/*  4 */ "aaaaaaaaaaaaaa"
+		/*  4 */ "aabaaaaaaaabaa"
 
 		// Level 5
 		/* z\x*             1111 */
@@ -2387,10 +2827,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 13, 1, 2: 5\n"  /* Type 1, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // DarkCorridor
 
 
@@ -2625,10 +3077,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 9, 1, 0: 2\n"  /* Type 1, direction Z- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // LavaStaircase
 
 
@@ -2938,10 +3402,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 0, 9, 7: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // LavaStaircaseBig
 
 
@@ -3200,10 +3676,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"",
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // LavaStairsBridge
 
 
@@ -3367,13 +3855,25 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 
 		// Connectors:
 		"1: 12, 1, 6: 5\n"  /* Type 1, direction X+ */
-		"1: -1, 1, 6: 4\n"  /* Type 1, direction X- */,
+		"1: 0, 1, 6: 4\n"  /* Type 1, direction X- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // MidStaircase
 
 
@@ -3497,10 +3997,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 3, 1, 0: 2\n"  /* Type 0, direction Z- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // StairsToOpen1
 
 
@@ -3624,10 +4136,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 3, 1, 0: 2\n"  /* Type 0, direction Z- */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // StairsToOpen2
 
 
@@ -3722,10 +4246,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 12, 1, 4: 5\n"  /* Type 1, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // Tee2x4
 
 
@@ -3832,10 +4368,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"1: 12, 1, 6: 5\n"  /* Type 1, direction X+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // Tee4x4
 
 
@@ -3921,10 +4469,22 @@ const cPrefab::sDef g_NetherFortPrefabs[] =
 		"0: 3, 1, 6: 3\n"  /* Type 0, direction Z+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		-99,
 	},  // Turret
 };  // g_NetherFortPrefabs
 
@@ -4108,10 +4668,22 @@ const cPrefab::sDef g_NetherFortStartingPrefabs[] =
 		"1: 6, 1, 12: 3\n"  /* Type 1, direction Z+ */,
 
 		// AllowedRotations:
-		7,  /* 1, 2, 3 CCW rotations */
+		7,  /* 1, 2, 3 CCW rotation allowed */
 
 		// Merge strategy:
 		cBlockArea::msSpongePrint,
+
+		// ShouldExtendFloor:
+		false,
+
+		// DefaultWeight:
+		100,
+
+		// DepthWeight:
+		"",
+
+		// AddWeightIfSame:
+		0,
 	},  // CentralRoom
 };