On 10/12/2010 10:23 AM, Warp wrote:
>    I don't understand how it could work ok with a bicubic patch, because
> a bicubic patch has no well-defined interior.
>

That is my understanding too but I did a couple of tests before posting. 
In the cases I tried it gave me the results I expected. (Assuming that a 
patch can be used in a difference or intersection.)

>    (Meshes don't have one either, by default, but an interior calculation
> for closed meshes can be turned on with the 'inside_vector' feature.
> IIRC discs work like planes in that they divide the space into two parts:
> the outside and the inside. However, because the visible surface does not
> cover the entire partition, they will cause odd behavior when used in CSG.)
>

That is true, discs do cause odd behavior when used in CSG.
-- 
Regards
     Stephen

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