John VanSickle wrote:

>> Not sure what kind of post-processing is supported by raytracers
>> out there.
> 
> For POV-Ray, it is as simple as pigmenting a polygon using a combination 
> of two or more image_maps, these being taken from frames rendered 
> earlier.

Yes, I probably should have said "is supported by *other*
raytracers except the one I know" ;) And I was thinking more
about built-in postprocessing which could be argued to work
in a single pass (such as post_process {} in MegaPOV) to
circumvent a no-multi-pass rule for a "purists".

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