diff -r fc18ac4833f2 -r a0a3e334744f src/kdtree.h
--- a/src/kdtree.h	Sun Nov 25 15:50:01 2007 +0100
+++ b/src/kdtree.h	Sun Nov 25 17:58:29 2007 +0100
@@ -31,13 +31,14 @@
 class KdNode
 {
 	float split;
-	bool leaf; /* is this node a leaf? */
-	short axis; /* 0,1,2 => x,y,z */
-	KdNode *children;
+	short axis; /* 0,1,2 => x,y,z; 3 => leaf */
 public:
-	ShapeList shapes;
+	union {
+		KdNode *children;
+		ShapeList *shapes;
+	};
 
-	KdNode() : leaf(true), axis(0), shapes() {};
+	KdNode() : axis(3) { shapes = new ShapeList(); };
 
 	void setAxis(short aAxis) { axis = aAxis; };
 	short getAxis() { return axis; };
@@ -45,13 +46,13 @@
 	void setSplit(float aSplit) { split = aSplit; };
 	float getSplit() { return split; };
 
-	void setLeaf(bool aLeaf) { leaf = aLeaf; };
-	bool isLeaf() { return leaf; };
+	void setLeaf() { axis = 3; };
+	bool isLeaf() { return axis == 3; };
 
 	KdNode *getLeftChild() { return children; };
 	KdNode *getRightChild() { return children+1; };
 
-	void addShape(Shape* aShape) { shapes.push_back(aShape); };
+	void addShape(Shape* aShape) { shapes->push_back(aShape); };
 
 	void subdivide(BBox bbox, int depth);
 };