The fog works OK in GL_LINEAR mode. But if I modify the frustum the GL_FOG_END and GL_FOG_START parameters dont work! What ever I do the fog-end and fog-start are not realy setted to the values. Sometimes there is everywhere a little bit fog but no end and sometimes there is a thick wall of fog what hide my polys behind a short distance.
How can I configurate the end and start with my modified frustum? (or is the problem somewhere else?)