MR
> hi marabou,
>
> hey!  thats one i can answer!  difference is a constructive
> solid geometry option, and that only works with "primitive"
> shapes, such as cylinders, boxes, spheres, etc.  all of those
> shapes except the donut (toroid) are listed in the scene
> language help document in section 2.2.

What do you mean with "primitive"? Difference truly works with every object
which has got a well defined "inside" and "outside". So it works fine with
planes, isosurfaces, heightfields and (with MegaPov) meshes too.

--
Jonathan.

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