lab/lmapper/shaders/lm_light_occlusion.sl

/****************************
Occlusion Light Shader
(c) Mad Processor, 2009

As with all baking-compatible
shaders, one should not use 
the faceforward() call.
*****************************/

light lm_light_occlusion(
  float samples = 64;
  string __category = "occlusion";
  float intensity = 1; 
  float maxbright = 1)
{
  normal shading_normal = normalize(Ns);
  //normal shading_normal = normalize(N);
  illuminate( Ps + shading_normal )
  {
    //timos ansatz (subtractive occlusion)
    //Cl = -intensity*clamp(occlusion( Ps, shading_normal, samples ),0,1);
    
    //original (additive occlusion)
    Cl = (1 - occlusion( Ps, shading_normal, samples )) * intensity;
    //bake( "occ.bake", s, t, Cl );
  }
}