diff -r c1080cb5bd6d -r fbdeb3e04543 src/octree.cc
--- a/src/octree.cc	Tue Dec 18 12:36:01 2007 +0100
+++ b/src/octree.cc	Sat Dec 29 13:53:33 2007 +0100
@@ -17,9 +17,6 @@
 
 void OctreeNode::subdivide(BBox bbox, int maxdepth)
 {
-	if (maxdepth <= 0 || shapes->size() <= 4)
-		return;
-
 	// make children
 	children = new OctreeNode[8];
 
@@ -69,7 +66,8 @@
 
 	// recursive subdivision
 	for (int i = 0; i < 8; i++)
-		children[i].subdivide(childbb[i], maxdepth-1);
+		if (maxdepth > 1 && getChild(i)->shapes->size() > 4)
+			children[i].subdivide(childbb[i], maxdepth-1);
 }
 
 void Octree::build()