In article <3A60C06B.2591866A@gmx.de>, Christoph Hormann 
<chr### [at] gmxde> wrote:

> referring to the discussion in povray.newusers, i tried to make a pattern
> testing if there is something 'above' the evaluated point.

This looks very similar to a simple version of a "visibility" pattern I 
was working on once. I used multiple samples to allow a blurred result, 
and my pattern was mainly to be used for a curvature pattern to make 
things like "patina" in concave areas on a copper sculpture.
The proximity pattern could probably be used for this too, using the 
sample_weighting feature (though I'm not sure that made it into 
MegaPOV). Both of these would be very slow, though.

The "project" keyword doesn't seem very intuitive, though...maybe it 
should be added to the "object" pattern instead. Or "visibility". :-)

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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