All right...

more specificaly, I would like to encode the flux of a certain vector field
V by a color along a surface. Are you telling me that there is no simple way
to do that with POVRAY?

There is the pattern slope which does almost what I want, except that it
returns a value which doesn't depend on the length of V (only on the angle).

Could I modify afterward the color returned by the slope pattern, according
to the length of V?

As you see, I am quite reluctant to learn how to use povman patch.

Yann


"Warp" <war### [at] tagpovrayorg> wrote in message
news:3fa068f9@news.povray.org...
> Yann <[antispam]rollin***@mit..edu))> wrote:
> > is it possible to access the normal vector to the object ?
>
>   No.
>
>   (You might want to search for the povman patch which might have this
> property.)
>
> -- 
> #macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb
M()}}
> N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
> N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  -
Warp -

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