> Volumetrics. No directly visible objects, the entire scene must be 
> composed of shapes only visible through interior attenuation or media. 
> Maybe refraction, as well...it'd allow some good photon scenes. And 
> maybe some severely restricted visible objects, such as a ground plane 
> or finite sky_sphere.
> Optics. Mirrors, prisms, lenses, etc. Nice caustic patterns, simulation 
> or illustration of specific optical effects, and so on.
> Radiosity only. Not much description needed...

The problem with these for competitions where the source is submitted
is that render times can be scary. I have not insignificant cluster
resources but even that is limited. Personally I like the idea of
keeping these source based, it keep people honest and is a great
learning resource for users. I've had lots of positive comments already
from people looking at how things are done by experts in the fractal
contest.

-- 
Paul Bourke
pdb_NOSPAMswin.edu.au

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