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diff --git a/src/Generating/PieceGeneratorBFSTree.h b/src/Generating/PieceGeneratorBFSTree.h
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+
+// PieceGeneratorBFSTree.h
+
+// Declares the cPieceGeneratorBFSTree class for generating structures composed of individual "pieces" in a simple tree
+
+
+
+
+
+#pragma once
+
+#include "ComposableGenerator.h"
+#include "PiecePool.h"
+#include "../Noise/Noise.h"
+
+
+
+
+
+class cPieceGeneratorBFSTree
+{
+public:
+	/** Creates a new object tied to the specified PiecePool, using the specified seed. */
+	cPieceGeneratorBFSTree(cPiecePool & a_PiecePool, int a_Seed);
+
+
+	/** Generates a placement for pieces at the specified coords.
+	The Y coord is generated automatically based on the starting piece that is chosen. */
+	void PlacePieces(int a_BlockX, int a_BlockZ, int a_MaxDepth, cPlacedPieces & a_OutPieces);
+
+
+protected:
+
+	/** The type used for storing a connection from one piece to another, while building the piece tree. */
+	struct cConnection
+	{
+		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, int a_Weight);
+	};
+	typedef std::vector<cConnection> cConnections;
+
+
+	/** The type used for storing a pool of connectors that will be attempted to expand by another piece. */
+	struct cFreeConnector
+	{
+		cPlacedPiece * m_Piece;
+		cPiece::cConnector m_Connector;
+
+		cFreeConnector(cPlacedPiece * a_Piece, const cPiece::cConnector & a_Connector);
+	};
+	typedef std::vector<cFreeConnector> cFreeConnectors;
+
+
+	/** The pool from which pieces are taken. */
+	cPiecePool & m_PiecePool;
+
+	/** The noise used for random number generation. */
+	cNoise m_Noise;
+
+	/** The seed used by this generator. */
+	int m_Seed;
+
+
+	/** Selects a starting piece and places it, including its height and rotation.
+	Also puts the piece's connectors in a_OutConnectors. */
+	cPlacedPiecePtr PlaceStartingPiece(int a_BlockX, int a_BlockZ, cFreeConnectors & a_OutConnectors);
+
+	/** Tries to place a new piece at the specified (placed) connector. Returns true if successful. */
+	bool TryPlacePieceAtConnector(
+		const cPlacedPiece & a_ParentPiece,      // The existing piece to a new piece should be placed
+		const cPiece::cConnector & a_Connector,  // The existing connector (world-coords) to which a new piece should be placed
+		cPlacedPieces & a_OutPieces,             // Already placed pieces, to be checked for intersections
+		cFreeConnectors & a_OutConnectors        // List of free connectors to which the new connectors will be placed
+	);
+
+	/** Checks if the specified piece would fit with the already-placed pieces, using the specified connector
+	and number of CCW rotations.
+	a_ExistingConnector is in world-coords and is already rotated properly
+	a_ToPos is the world-coords position on which the new connector should be placed (1 block away from a_ExistingConnector, in its Direction)
+	a_NewConnector is in the original (non-rotated) coords.
+	Returns true if the piece fits, false if not. */
+	bool CheckConnection(
+		const cPiece::cConnector & a_ExistingConnector,  // The existing connector
+		const Vector3i & a_ToPos,                        // The position on which the new connector should be placed
+		const cPiece & a_Piece,                          // The new piece
+		const cPiece::cConnector & a_NewConnector,       // The connector of the new piece
+		int a_NumCCWRotations,                           // Number of rotations for the new piece to align the connector
+		const cPlacedPieces & a_OutPieces                // All the already-placed pieces to check
+	);
+
+	/** DEBUG: Outputs all the connectors in the pool into stdout.
+	a_NumProcessed signals the number of connectors from the pool that should be considered processed (not listed). */
+	void DebugConnectorPool(const cFreeConnectors & a_ConnectorPool, size_t a_NumProcessed);
+} ;
+
+
+
+