> Thanks Alain and Jaime for your quick and detailed response. One of the
> motivations for my question is the result posted in this URL:
> 
> http://www.donzoptix.co.uk/POVZEMAX/CaliZMPV.html
> 
> Kanak
> 
> 
> 
> 
> 
OK
What was done there is to project the light on a plane, render that 
plane, then use the resulting image as the source to create a hight_field.

Altough POV-Ray was not created to do such light propagation analysis, 
it can be done in a few steps.
It's one of those cases when the possibilities of a tool FAR excede the 
purpose for whitch it was created.


Alain

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