Boolean difference failure between two tetrahedrons?

[Helvetosaur]

From Chuck in a previous forum post:

Hollowing out insides of solids ..how is this best done?

If you don’t want to do anything in Rhino with the result, try NonmanifoldMerge followed by CreateRegions. You will get two regions. The one you want and the part you want to remove. The hollowed out piece will probably turn into two separate polysurfaces if you do anything to it in Rhino.

Rhino is not currently designed to create “disjoint” hollow objects. What are you trying to accomplish?

–Mitch