help - problems with zbuffer

[OPMANOJ at ncsuvm.ncsu.edu]

Hi,
   I am having problems using the zbuffer on our PI.

   When it "works", edges with the same depth value are broken up. Yes, I left
the zfunction as less than or equal to (the default).

   If I use zbuffer with "perspective" and "lookat" I get no hidden surface
elimination at all. If I just comment out the perspective call - works fine.

                  Thanks for any help you can give me,

                                 Manoj Patel