Chris Huff wrote:
> 
> Or just render an image from above the scene and use the depth
> post_process...
> 

Or a gradient pigment with black/white color_map and 
finish { ambient 1 diffuse 0 ) combined with an orthographic camera.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
Homepage: http://www.schunter.etc.tu-bs.de/~chris/

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