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Would there be any desire for tetrahedron primitives? Here are two I have created. One has 3 faces drawn and all edges, the other has one edge removed.
I don't think that this shape is common enough to be a primitive because it involves a sharp peak. Or do you have some use cases?
(2018-06-10, 19:36)Santeri Piippo Wrote: [ -> ]I don't think that this shape is common enough to be a primitive because it involves a sharp peak. Or do you have some use cases?

One place where such a primitive can be used is in subpart 29115s01.dat there may be others as well.
Basically it would be for use where there are notches cut into sloping surfaces.

EDIT:
The primitive could also be used in part 2623.