In article <3FCA8324.D3FB307B@gmx.de>,


> > This is not really correct, uv-mapping is a way to map a pattern on an
> > object surface.  Naturally eval_pigment() (or pigment/pattern functions
> > in general) can't make use of it in any way.
> 
> What are the underlying (mathematical?) reasons for this behaviour?

UV-mapping maps a texture to a surface using the UV coordinates of the 
evaluated point on that surface. Without a surface, there are no UV 
coordinates, and thus no UV mapping. Similarly, the slope pattern only 
works when applied to a surface.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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