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- POV-Ray and most other ray tracers can only simulate directly, one of
- these three types of illumination. That is the light which comes directly
- from the light source which diffuses in all directions. The keyword 'dif-
- fuse' is used in a finish statement to control how much light of this direct
- light is reflected via diffuse reflection. For example:
- finish { diffuse 0.7 }
- means that 70% of the light seen comes from direct illumination from light
- sources. The default value is diffuse 0.6.
-