diff --git a/panda/src/pgraph/cullTraverser.cxx b/panda/src/pgraph/cullTraverser.cxx
index 21a3152600..0f43d09c1c 100644
--- a/panda/src/pgraph/cullTraverser.cxx
+++ b/panda/src/pgraph/cullTraverser.cxx
@@ -96,11 +96,11 @@ traverse(const NodePath &root, bool python_cull_control) {
     portal_viewer.draw_camera_frustum();
 
     // for each portal draw its frustum
-    for (int portal_idx=1; portal_idx<2; ++portal_idx) {
+    for (int portal_idx=2; portal_idx<3; ++portal_idx) {
       PT(BoundingVolume) reduced_frustum;
       
       portal_viewer.prepare_portal(portal_idx);
-      portal_viewer.clip_portal(portal_idx);
+      //portal_viewer.clip_portal(portal_idx);
       if ((reduced_frustum = portal_viewer.get_reduced_frustum(portal_idx))) {
         // This reduced frustum is in camera space
         pgraph_cat.debug() << "got reduced frustum " << reduced_frustum << endl;
diff --git a/panda/src/pgraph/portalClipper.cxx b/panda/src/pgraph/portalClipper.cxx
index 96b73d1587..16298301f8 100755
--- a/panda/src/pgraph/portalClipper.cxx
+++ b/panda/src/pgraph/portalClipper.cxx
@@ -363,46 +363,62 @@ get_reduced_frustum(int idx)
   // than bounding planes (which I might have to implement soon)
   
   if (!_num_vert)
-    return false;
+    return NULL;
   
   float t;
+  bool visible = true;
   // find intersection of 7->0 with far
   LPoint3f from_origin = _hex_frustum->get_point(7);
   LVector3f from_direction = _coords[0] - from_origin;
   bool is_intersect = _hex_frustum->get_plane(0).intersects_line(t, from_origin, from_direction);
-  if (is_intersect) {
+  if (is_intersect && t >= 0.0) { // has to be positive, else camera is not looking at the portal
     pgraph_cat.debug() << "far plane intersected 7->0 at t=" << t << endl;
     intersect_points[0] = from_origin + t*from_direction;
     pgraph_cat.debug() << intersect_points[0] << endl;
   }
-  
+  else
+    visible = false;
+
   // find intersection of 4->1 with far
   from_origin = _hex_frustum->get_point(4);
   from_direction = _coords[1] - from_origin;
   is_intersect = _hex_frustum->get_plane(0).intersects_line(t, from_origin, from_direction);
-  if (is_intersect) {
+  if (is_intersect && t >= 0.0) { // has to be positive, else camera is not looking at the portal
     pgraph_cat.debug() << "far plane intersected 4->1 at t=" << t << endl;
     intersect_points[1] = from_origin + t*from_direction;
     pgraph_cat.debug() << intersect_points[1] << endl;
   }
+  else
+    visible = false;
+
   // find intersection of 5->2 with far
   from_origin = _hex_frustum->get_point(5);
   from_direction = _coords[2] - from_origin;
   is_intersect = _hex_frustum->get_plane(0).intersects_line(t, from_origin, from_direction);
-  if (is_intersect) {
+  if (is_intersect && t >= 0.0) { // has to be positive, else camera is not looking at the portal
     pgraph_cat.debug() << "far plane intersected 5->2 at t=" << t << endl;
     intersect_points[2] = from_origin + t*from_direction;
     pgraph_cat.debug() << intersect_points[2] << endl;
   }
+  else
+    visible = false;
+
   // find intersection of 6->3 with far
   from_origin = _hex_frustum->get_point(6);
   from_direction = _coords[3] - from_origin;
   is_intersect = _hex_frustum->get_plane(0).intersects_line(t, from_origin, from_direction);
-  if (is_intersect) {
+  if (is_intersect && t >= 0.0) { // has to be positive, else camera is not looking at the portal
     pgraph_cat.debug() << "far plane intersected 6->3 at t=" << t << endl;
     intersect_points[3] = from_origin + t*from_direction;
     pgraph_cat.debug() << intersect_points[3] << endl;
   }
+  else
+    visible = false;
+
+  if (!visible) {
+    pgraph_cat.debug() << "portal" << idx << " is not visible from current camera look at" << endl;
+    return NULL;
+  }
   
   // With these intersect_points, construct the new reduced frustum
   PT(BoundingVolume) reduced_frustum = new
diff --git a/panda/src/pgraph/portalNode.cxx b/panda/src/pgraph/portalNode.cxx
index 699d3c5d5a..f3942752fb 100755
--- a/panda/src/pgraph/portalNode.cxx
+++ b/panda/src/pgraph/portalNode.cxx
@@ -229,7 +229,17 @@ recompute_internal_bound() {
   BoundingVolume *bound = PandaNode::recompute_internal_bound();
   nassertr(bound != (BoundingVolume *)NULL, bound);
 
+  GeometricBoundingVolume *gbv = DCAST(GeometricBoundingVolume, bound);
+
   // Now actually compute the bounding volume by putting it around all
+  // of our vertices.
+
+  const LPoint3f *vertices_begin = &_vertices[0];
+  const LPoint3f *vertices_end = vertices_begin + _vertices.size();
+
+  // Now actually compute the bounding volume by putting it around all
+  gbv->around(vertices_begin, vertices_end);
+
   return bound;
 }