This operator allows you to determine which vertices of a tetrahedron form each of the four triangles of the tetrahedron.
-1 if an invalid number is specified.
3 to refer to the four vertices of a generic tetrahedron.
Disk file to read for the geometry. Can be
op:/obj/object/soppath to read live SOP geometry.
The face on the tetrahedron. Face 0 is the triangle that doesn’t have vertex 0.
Which vertex on that face’s triangle to retrieve, 0..2.