On 2/23/25 15:27, William F Pokorny wrote:
> If not a problematic version of POV-Ray, I'd bet next on something with 
> the mesh, but...?

Another upfront question is: Are you sure the mesh is really closed?

The 'Solid' part of Constructive Solid Geometry is often important - 
though you can get away with quite a bit in practice.

And, have you tried an intersection{} instead?

intersection {
   object { Screw }
   plane { -y, 0 }
}

Bill P.

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