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diff --git a/source/Trees.h b/source/Trees.h
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+
+// Trees.h
+
+// Interfaces to helper functions used for generating trees
+
+/*
+Note that all of these functions must generate the same tree image for the same input (x, y, z, seq)
+	- cStructGenTrees depends on this
+To generate a random image for the (x, y, z) coords, pass an arbitrary value as (seq).
+*/
+
+
+
+
+
+#pragma once
+
+#include "ChunkDef.h"
+#include "cNoise.h"
+
+
+
+
+
+// Blocks that don't block tree growth:
+#define CASE_TREE_ALLOWED_BLOCKS \
+	case E_BLOCK_AIR: \
+	case E_BLOCK_LEAVES: \
+	case E_BLOCK_SNOW: \
+	case E_BLOCK_TALL_GRASS: \
+	case E_BLOCK_DEAD_BUSH: \
+	case E_BLOCK_SAPLING: \
+	case E_BLOCK_VINES
+
+// Blocks that a tree may overwrite when growing:
+#define CASE_TREE_OVERWRITTEN_BLOCKS \
+	case E_BLOCK_AIR: \
+	case E_BLOCK_LEAVES: \
+	case E_BLOCK_SNOW: \
+	case E_BLOCK_TALL_GRASS: \
+	case E_BLOCK_DEAD_BUSH: \
+	case E_BLOCK_SAPLING: \
+	case E_BLOCK_VINES
+
+
+
+
+
+/// Generates an image of a tree at the specified coords (lowest trunk block) in the specified biome
+void GetTreeImageByBiome(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, EMCSBiome a_Biome, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random apple tree
+void GetAppleTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a small (nonbranching) apple tree
+void GetSmallAppleTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a large (branching) apple tree
+void GetLargeAppleTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random birch tree
+void GetBirchTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random conifer tree
+void GetConiferTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random spruce (short conifer, two layers of leaves)
+void GetSpruceTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random pine (tall conifer, little leaves at top)
+void GetPineTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random swampland tree
+void GetSwampTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random apple bush (for jungles)
+void GetAppleBushImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+/// Generates an image of a random jungle tree
+void GetJungleTreeImage(int a_BlockX, int a_BlockY, int a_BlockZ, cNoise & a_Noise, int a_Seq, sSetBlockVector & a_Blocks);
+
+
+
+
+