glutWireTetrahedron man page
glutWireTetrahedron — Draw a wireframe tetrahedron.
OpenGLUT - geometry
This function draws a regular, wireframe 4-sided polyhedron centered at the origin. The distance from the origin to the vertices is 1.
into one array.
Put the normals into the (or an) array.
Make the array static const, with file scope, and share with glutSolidTetrahedron().
Maybe consolidate with the SierpinskySponge?