On Thu, 20 May 1999 06:24:18 -0500, Bob Hughes wrote:
>The 'gradient' is introducing noise into the pigment when aligned
>with a flat surface such as the box or ends of a cylinder.
>The appearence is similar to the "same surface" problem in CSG.

I've always used the same solution, too: scale the gradient by 
1.0001 or so to push that transition past the end of the object.
This one is probably even harder to fix than the coincident 
surfaces.  It's due to numerical inaccuracies in the intersection
routines.  Why it should appear differently on subsequent renders 
is a mystery, however.

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