1 files changed, 23 insertions, 3 deletions
diff --git a/BSPTree.cpp b/BSPTree.cpp
index 3254446..6da2531 100644
--- a/BSPTree.cpp
+++ b/BSPTree.cpp
@@ -54,11 +54,11 @@ void BSPTree::Plane::partition(const Triangle &t, std::list<Triangle> *front, st
 
 
 BSPTree::BSPTree(const std::list<Triangle> &triangles) : frontTree(0), backTree(0) {
-  if(triangles.empty())
-    return;
-
   const Triangle *planeT = findNearestTriangle(triangles, findCenter(triangles));
 
+  if(!planeT)
+    return;
+
   plane = Plane(*planeT);
 
   std::list<Triangle> front, back;
@@ -93,6 +93,26 @@ BSPTree::BSPTree(const std::list<Triangle> &triangles) : frontTree(0), backTree(
     backTree = new BSPTree(back);
 }
 
+BSPTree& BSPTree::operator=(const BSPTree &tree) {
+  if(frontTree) {
+    delete frontTree;
+    frontTree = 0;
+  }
+
+  if(backTree) {
+    delete backTree;
+    backTree = 0;
+  }
+
+  plane = tree.plane;
+  triangles = tree.triangles;
+
+  if(tree.frontTree)
+    frontTree = new BSPTree(*tree.frontTree);
+
+  if(tree.backTree)
+    backTree = new BSPTree(*tree.backTree);
+}
 
 vmml::vec3f BSPTree::findCenter(const std::list<Triangle> &triangles) {
   vmml::vec3f v;