I've placed a thin blue wall full of square holes in front of a white solid
wall, with a single light source to the left and above. The shadows I'm
getting don't make any sense at all.  Here's the code, plus a small .gif of
just the holes. With the light source as defined I'd expect the shadows to
be more or less uniform behind each hole.

This is just a test file - the original was more elaborate. That's where the
problem first cropped up. By the way, I'm using the Windows 3.1e version on
a Pentium 90, 64 meg/RAM.

Any help is appreciated.

Ken
--------------------------------------
camera
 {
  location <0,0,-60>
  direction <0,0,2>
  up <0,1,0>
  right <4/3,0,0>
  look_at <0,0,1>
 }

light_source {<-10000,10000,-45000> color White}

object
 {
  box {<-20,-20,0>,<20,20,0.1>}
  pigment
   {
    color White
   }
  finish
   {
    ambient 0.6
    reflection 0
   }
 }

object
 {
  difference
   {
    box {<-20,-20,-0.4>,<20,20,-0.41>}
    box {<-18,-1,-1>,<-16,1,1>}
    box {<-15,-1,-1>,<-13,1,1>}
    box {<-12,-1,-1>,<-10,1,1>}
    box {<-9,-1,-1>,<-7,1,1>}
    box {<-6,-1,-1>,<-4,1,1>}
    box {<-3,-1,-1>,<-1,1,1>}
    box {<0,-1,-1>,<2,1,1>}
    box {<3,-1,-1>,<5,1,1>}
    box {<6,-1,-1>,<8,1,1>}
    box {<9,-1,-1>,<11,1,1>}
    box {<12,-1,-1>,<14,1,1>}
    box {<15,-1,-1>,<17,1,1>}
   }
  pigment
   {
    color blue 0.4
   }
  finish
   {
    ambient 1
    reflection 0
   }
 }

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Attachments:
Download 'shadtest.gif' (2 KB)

Preview of image 'shadtest.gif'