> I tried to draw some cylinders but they seem to have zero width.  I could
> not find a way to draw cylinders with a substantial width.
> 

Look up difference in the povray documentation.

difference {
    cylinder
    {
       <0,0,0>,
       <0,1,0>,
       1
       pigment { color rgb <1,0,0> } //red
    }
    cylinder
    {
       <0,0.5,0>,
       <0,1.1,0>,
       0.5
       pigment { color rgb <0,0,1> } //blue
    }
}

This code would make a cylinder with a cylinderial piece cut out of it. 
  The second one is what is cut out of the first one.  You can have as 
many shapes cut out of the first shape.
If you need more help you can always ask.

Brendan

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