Hi,
I'm completely new to POVRAY, intention was to use it to quickly explore the
optical effects of a mirror defined using some equations. In the process of
setting things up, I find myself unable to obtain a correctly reflecting sphere
given as a parametric object. Staying close to published examples, I find that
this

camera { location <-1,3,-6> look_at <0,0,0> angle 35 }
light_source { <100,200,-200> color 1 }

// The floor
plane { <0,1,0>,-1 pigment { checker rgb <1,0,0>, rgb <1,1,0> } }

// A mirror sphere
sphere
{ <0,0,0>,1
  pigment { rgb <0,0,0> } // A perfect mirror with no color
  finish { reflection 1 } // It reflects all
}


renders a mirrored sphere with correct reflections of the checkerboard while
this

camera { location <-1,3,-6> look_at <0,0,0> angle 35 }
light_source { <100,200,-200> color 1 }

// The floor
plane { <0,1,0>,-1 pigment { checker rgb <1,0,0>, rgb <1,1,0> } }
// the sphere
parametric {
 function { sin(u)*cos(v) }
 function { sin(u)*sin(v) }
 function { cos(u) }

 <0,0>, <2*pi, pi>
 contained_by { sphere{0, 1.1} }
 accuracy 0.0001
 precompute 10 x,y,z
    pigment {
       rgb <0,0,0>
    }
    finish {
      reflection 1
    }
  }

gives a sphere, but with incorrect reflections (only a few colored
points/stripes)...

Any hints much appreciated!

Thanks,
Sven

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