In article <35CF2FDB.26B4BE1D@pacbell.net>, tyl### [at] pacbellnet says...
>
 With regards to sors, prisms,
>and lathes, are they too considered to be infinitely thin objects,
>with the only difference they have from a disc object would be
>that the have been folded in 3d space to form a definable shape.

Lathes, SOR, and prisms are "plain" shapes, with a well-defined 
inside/outside, and should work (and usually does) well in CSG.
However, high order calculations they require sometimes leads
to unexpected results.
Have you tried the STURM keyword with these ?

Cheers,
Fabien.

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