I was wrong in describing the problem in the previous posting:
a rgbf-lathe has black measles on its own
in the following simpler file, the problem is already observable
but not so pronounced as in the example from my previous posting

// Persistence Of Vision raytracer version 3.1 sample file.
// rgbf lathe does not render properly (result is only a sparse random
pixel pattern)
// Win95 4.00.950B PII 300
// Povray 3.1e.msvc.win32 (PII optimized)
// File by Stefan Hahn


#declare eye = <-1,5,-1> ;
   lathe {
      linear_spline 5
      <0.00,0>
      <0.025,0.01>
      <0.1,0.04>
      <0.2,0.0>
      <0.00,0>

      pigment{color rgbf<1,1,1,0.5> }
   }

//cosmetics only
plane { y, 0  pigment {  checker  color White color Red scale 0.03
}finish{ambient 0.2 diffuse 0.6}}
camera {angle 30 location <-1,5,-1>   up <0, 0.5, 0> right <0.6666, 0,
0> look_at <0,0,0> }
light_source { <10, 10, -100> colour White }

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