I meant coherence in the way Warp understood it. So I wanted to know:
- Does POV-Ray use any information of one frame to speed up calculation of
  the next frame while rendering an animation?
- Is a form of ray coherence used to speed up calculation?

My question was not intended towards physical effects based on coherence,
because I know that most ray tracers --including POV-Ray-- are using the particle
model of light, not the wave model. So, this question was about the software
engineering part of POV-Ray =).

Thanks for that fast replies,

Andre Wesseling

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