In article <3efdeab9@news.povray.org>, "manuel" <man### [at] tinit> 
wrote:

> To set the projection of a bitmap we have
> the map_type value.
> 
> And to set the projection of a simple pigment,
> like checker?

Patterns do not have projections, the projection is an attribute of 
image maps. There are mapping warps which can be used to deform the 
pattern to fit a surface, and some shapes support UV mapping.

-- 
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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