diff -r 3239f749e394 -r f9fad94cd0cc src/raytracer.cc
--- a/src/raytracer.cc	Thu Nov 22 21:46:09 2007 +0100
+++ b/src/raytracer.cc	Fri Nov 23 01:24:33 2007 +0100
@@ -57,7 +57,7 @@
 {
 	Shape *nearest_shape = NULL;
 	ShapeList::iterator shape;
-	for (shape = shapes.begin(); shape != shapes.end(); shape++)
+	for (shape = top->shapes.begin(); shape != top->shapes.end(); shape++)
 		if (*shape != origin_shape && (*shape)->intersect(ray, nearest_distance))
 			nearest_shape = *shape;
 	return nearest_shape;
@@ -221,6 +221,12 @@
 	float vy;
 	RenderrowData *d;
 
+	printf("* building kd-tree\n");
+	//cout << endl;
+	static_cast<KdTree*>(top)->optimize();
+	//static_cast<KdTree*>(top)->save(cout);
+	//cout << endl;
+
 	//srand(time(NULL));
 
 	// eye - viewing point
@@ -283,11 +289,6 @@
 	return data;
 }
 
-void Raytracer::addshape(Shape *shape)
-{
-	shapes.push_back(shape);
-}
-
 void Raytracer::addlight(Light *light)
 {
 	lights.push_back(light);