When It comes to sorting polygons and 3d graphics i''m only a beginner. My problem is that if I try to impliment a simple sort of the average z value of my triangles used to create a 3d cube they are sorted incorrectly at certain points. They seem to be in the right order untill just before they are backfacing and removed completly. When I created a cube using square polys instead of triangle ones the code worked fine. How can i properly sort triangles arranged into a 3d cube ?