Actually, if you only want a mix of two colours dependant on the angle
then you can do this with a very simple  pigment shader:

surface incoming ( float falloff = 1.0; color col1 = (1,0,0), col2 =
(0,1,0);)
{ 
  Ci = mix(col1, col2, pow (abs(normalize(N).normalize(I)), falloff));
}

and in POVMan use a declaration such as

#declare incoming = pigment {
  shader{
    shader_file "incoming.slp"
    "falloff" 5
    "col1" <1,0.5,0>
    "col2" <0,1,0.5>
  }
}

This works with direct and reflected rays, you can add whatever finish
you like too.

Bye for now,
	Mike Andrews.


"Bob H." wrote:
> 
> "Bob H." <omn### [at] msncom> wrote in message
> news:3b52f036@news.povray.org...
> > "Michael Andrews" <M.C### [at] readingacuk> wrote in message
> > news:3B5### [at] readingacuk...
> > >
> > > If anyone can see another way of doing it I would also like to know ...
> >
> > What I just thought of was to use the MegaPOV angle dependent reflection
> in
> > a two layered texture, trick being to use opposing min and max color
> > vectors.  Maybe that has already been mentioned, if so I didn't notice.
> 
> Okay, maybe that wasn't relating to the previous message reply so much but I
> just gave it a try to see how it would look.  It's close to that kind of car
> paint, since cars do reflect it's about all it might pass for becuase it
> certainly isn't a ny sort of angle dependent pigment.
> 
> sphere {0,1
> texture {
>  pigment {rgb .25}
>   finish {
>         reflection_type 0 reflection_min <.1,0,0> reflection_max <1,0,0>
>         }
> }
> texture {
>  pigment {rgbt .75}
>   finish {
>         reflection_type 0 reflection_min <0,0,1> reflection_max <0,0,.1>
>         }
> }
> }
> 
> Bob H.

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