No gradient warnings. And its changing does not help.

Here is another example of a strange thing. The upper part should be Jade but it
is partly red.


#include "colors.inc"
#include "textures.inc"
#include "metals.inc"

light_source {<9, 4, 4>*3.2 color White}
camera {orthographic
  location <9, 5, 4>/5
  look_at (<0,0,1>)/2
  sky <0,0,1>
}

#declare c1 = texture {pigment {color Red}}
#declare c2 = texture {pigment {color Green}}
#declare c3 = texture {pigment {color Gray}}
#declare c4 = texture{Jade finish { diffuse 0.8 phong 3 }}

#declare k= 0.8;//(sqrt((1+T)/(3-T)));

#declare a=sqrt(3*k*k-1)/2;
#declare b=sqrt(k*k+1)/2;
#declare c=1;

#declare disk= cylinder{<0,0,0>, <0, 0, 3>, 0.8}


#declare slp= isosurface{
    function{
     min(
      x*a+y*b+z*c-a,
      x*a-y*b+z*c-a
     )
    }
    max_gradient 4
//    contained_by{box{-3, 3}}
    contained_by{sphere{0, 3}}
   }



intersection{
 object{slp rotate <0,0,84> texture{c4} no_shadow}
 object{disk texture{c1} no_reflection no_shadow}
 }

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