The source code upon which this tutorial is based, is from an older contest entry of mine (at OGLchallenge.dhs.org). The theme was Collision Crazy and my entry (which by the way took the 1st place :)) was called Magic Room. It features collision detection, physically based modeling and effects. -The source code upon which this tutorial is based, is from an older contest entry of mine (at OGLcha llenge.dhs.org). The theme was Collision Graz y and my entry (which by the way took the 1st place :)) was called Magic Room. It features collision detection, physically based modeling and effects.