In article <3fa06504$1@news.povray.org>,
 "Yann" <[antispam]rollin***@mit..edu))> wrote:

> I want to use a pattern defined by a function. I know that it is possible to
> access the coordinates from inside the function, however is it possible to
> access the normal vector to the object ?

Very unfortunately, this is not possible. Of course, if you know the 
object the pattern is being applied to, you can compute the normal given 
the point being evaluated, but this is only practical in very limited 
and simple cases.

-- 
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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