On Thu, 03 Jun 1999 11:34:04 -0700, Royce Sullivan wrote:
>Greetings,
>
>I putting together a scene and I'm trying to create a CSG ashtray with
>three slots at 120 degree intervals. The core ashtray is the difference
>between two cylinders defined along the y-axis. The inner cylinder is
>'open '.  

'open' objects aren't guaranteed to work in CSG.  Fortunately, there's
no good reason for the inner cylinder to be open anyway.  I'm not sure
if this is your problem, though.  If that doesn't fix it, try posting 
a little code to demonstrate the problem.

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