Hi David,

I've checked your code with
   Windows 2000 Professional
   POV-Ray 3.5.icl.win32
using  the following IMGdat.dat file:

1, 0, 0,
0, 1, 0,
0, 0, 1,
1, 1, 1,

This gave four overlapping spheres with the expected colors: red, green,
blue, and white. The only reason for your error I can think of is "color
overflow": are you sure all your C1, C2, C3 are >=0 and <=1?

   Sputnik

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