In article <3A112510.9DB97405@skynet.be>, Fabien Mosen 
<fab### [at] skynetbe> wrote:

> An idea : using the "trace" function to "scan" the geometry below the
> cloth piece, and use the resulting height data into your utility...

Or just render an image from above the scene and use the depth 
post_process...

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

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