http://img332.imageshack.us/img332/9692/eycompo00007cl.jpg
When I look at that part of the cliff it disapears and when I walk closer to it I can see it normally again! The part that disapears is made out of many part of brushes not full ones! I'm using direct3D! And whats causing it? How can I fix it and will it be seen in openGL too? (I can't use openGL )