diff -r 3239f749e394 -r f9fad94cd0cc src/kdtree.h
--- a/src/kdtree.h	Thu Nov 22 21:46:09 2007 +0100
+++ b/src/kdtree.h	Fri Nov 23 01:24:33 2007 +0100
@@ -2,6 +2,8 @@
 #define KDTREE_H
 
 #include <vector>
+#include <iostream>
+#include <fstream>
 
 #include "scene.h"
 
@@ -44,9 +46,12 @@
 public:
 	float pos;
 	int lnum, rnum;
-	SplitPos(float &aPos): pos(aPos) {};
+	SplitPos(): pos(0.0), lnum(0), rnum(0) {};
+	SplitPos(float &aPos): pos(aPos), lnum(0), rnum(0) {};
 	friend bool operator<(const SplitPos& a, const SplitPos& b)
 		{ return a.pos < b.pos; };
+	friend bool operator==(const SplitPos& a, const SplitPos& b)
+		{ return a.pos == b.pos; };
 };
 
 class SplitList: public vector<SplitPos>
@@ -56,12 +61,13 @@
 class Container
 {
 protected:
-	ShapeList shapes;
 	BBox bbox;
 public:
-	Container(): shapes(), bbox() {};
-	void addShape(Shape* aShape);
+	ShapeList shapes;
+	Container(): bbox(), shapes() {};
+	virtual void addShape(Shape* aShape);
 	//void addShapeNoExtend(Shape* aShape) { shapes.push_back(aShape); };
+	virtual void optimize() {};
 };
 
 class KdNode
@@ -95,9 +101,12 @@
 class KdTree: public Container
 {
 	KdNode *root;
+	bool built;
 public:
-	KdTree() {};
-	void build();
+	KdTree() : Container(), built(false) {};
+	void addShape(Shape* aShape) { Container::addShape(aShape); built = false; };
+	void optimize(); // build kd-tree
+	void save(ostream &str, KdNode *node = NULL);
 };
 
 #endif