Sven Littkowski wrote:
> Marc,
> 
> thanks for your hint! I truly don't new about that keyword. Well, I tried 
> out, but have no success yet. What do I wrong?
> 
> sphere
> {
>  < 0.0, 0.0, 0.0 > 1.0
>  pigment
>  {
>   spherical
>   pigment_map
>   {
>    [ 0.0000 Clear ]
>    [ 1.0000 Blue ]
>   }
>  }
>  finish { ambient 0.0 }
>  scale 1.0075
> }
> 
> Sven 
> 
> 

Well, you're only showing the surface of the object.  As Warp said, you 
probably want media inside it.

However, to see the effect of the pattern more easily, try this:

camera {
	location -z*3
	look_at 0
}

intersection {
	sphere {0, 2}
	box {<-2,-2,0>, 2}
	pigment {
		spherical
		color_map {
			[0 color rgb y]
			[1 color rgb z]
		}
	}
	finish {ambient 1 diffuse 0}
}

This will show quite clearly a transtion from green to blue (you don't 
need any lights to see it either, because of the ambient) and hopefully 
allow you to grasp the function better.

Also, you might wonder why I used a sphere with a radius of 2: to allow 
you to see the effect of the function past the boundary (distance 1 from 
origin).  If you'd like a repeating pattern, replace spherical with 
onion, and rerender.  You'll see the pattern repeated twice.

...Chambers

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