Could you advice me how to do this: http://www.novaui.com/dc/insphere.png
this is a tetrahedral, and the faces reflect each other, and the ball reflect each other too, I can't make it same like the picture does by using cube camera, could you give me some clue?
No correct solution
You need raytracing for this. That's something that we can't easily do yet. NVIDIA was showing some raytracing in realtime in their new Kepler graphics card presentation some weeks ago.