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Occluded shading color.
Unoccluded shading color.
Controls the number of occlusion samples per camera hit point.
Sample distribution can be uniform or cosine.
Sample spread of rays for cosine distribution. A value of f 1 gives Lambertian distribution.
Falloff values greater than zero create a softer look. Values less than zero give a hard edge when combined with max distance.
The max distance at which objects may occlude.
Trace rays in the direction of the surface normal (outside), inverse to the normal (inside), or in both directions.
Add a directinoal bias to the normal vector.