Thomas de Groot wrote:
> I want to play a little bit with your include file to see if 
> I can generate some more comments :-) I have a few ideas maybe....

Some notes that I forgot to share last night: The macro assumes that y 
is up, and that the sand object has no visible vertical surfaces or 
undercuts (think "height field").

The macro actually generates two overlapping copies of the geometry, 
slightly displaced on the y axis. This creates a thin layer just beneath 
the surface which is where the scattering media lives; the second object 
creates an opaque back that prevents Povray from tracing any deeper into 
the object.

This does help render time, but my original motivation for this system 
was so that objects wouldn't create ghostly silhouettes where they 
intersect the ground surface. Otherwise, it's possible to make this work 
right by correctly combining scattering, absorbing, *and* emitting media 
in the SSS object, but it's complicated to get the colors you want, it's 
slow to render, and it does not want to play nice with radiosity.

-- 
William Tracy
afi### [at] gmailcom

Today's random quote is:
wtracy: that makes more sense than some of the things I was thinking
wtracy: that is certainly less disturbing than some of the things I was 
thinking
     -- seen in #cplug

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