GL_SPHERE_MAP

Self-Generated Environment Mapping :

• Around a given Object , render the environment cube :
  from the Object centre, 6 views (fov 45 degrees) of the scene excluding the Object
  
  
• Each time the ModelView matrix or any of the 6 environmental walls changes, re-generate the Object's environment map :
  
  [ update the obsolete Environmental wall = draw & read ]
  foreach texel (s,t)
  
  compute corresponding R vector
  Intersect with environment cube
  Get environment color
  
  next texel
  
  
  
  
• Use this environment map for the Object only