Hi,

that was the hint into the right direction! I've added a translate
<0,1450,0> to shift it to y_min.

Thanks a lot
Wolfgang

"Mr Seb" <ban### [at] wanadoofr> wrote:
> Try this :
> #declare pig=pigment {gradient y color_map{
>  [0 Black]
>  [1 Red]
>  }
>  scale 300
>  }
>
> (the 300 is approximative, this is the max_y in your example)
>
> and replace pigment {Red} by pigment {pig} in your scene
> "

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