I have a simple glass disk (cylinder) lying on a white surface, and rather
than appearing clear, there's a bunch of black 'noise' appearing under the
disc. Seems like a max_trace_level problem, but I cranked that up into the
hundreds with no success. If I move the disc up the tiniest fraction so it
hovers above the surface, it appears fine, seems like some surface
interaction or something. Any  ideas? Running on Win2K, 650MHz, 392M RAM,
POV-Ray Version 3.1g.watcom.win32. Here's the scene code, any ideas? Is this
a bug?


#version 3.1
#include "colors.inc"
#include "glass.inc"

global_settings {
   max_trace_level 7
}

camera
{
  location  <0, 15, -80>
  look_at   <0,  2, 0>
  angle 7
}

light_source
{ 
  <100, 90, -60> color rgb 2
}


plane
{ y, -1.0
  texture
  { pigment { color Brown*1.3 }
    finish {reflection 0.2} 
  }}  


box
{
  <-2,-1,6><300, -0.00, -400>        
  texture { pigment { color White*0.9 } }  
}  

#declare Blue_Glass =
texture {
    pigment { color rgbf <0.96, 0.96, 1.5, 0.9>  }
    finish { F_Glass3 }
}
                      
cylinder{ 
  <0,0,0><0,0.3,0>,1.8 
  texture{Blue_Glass}  
}

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