@nyrath @n1xnx @arclight
IIRC Steve mentioned OGRE! when he introduced us at PoGo that once.

(I had similar trig mania, but for Fuller Geodesic Domes, and later on, goniometers of all sorts #instrumentsOfMathsInstruction ).

(I cheated mathswise on my 3D star chart: inscribed spherical coords (RA & Dec) on 6" craft Styrofoam sphere and inserting measured pipe cleaners for range to stars.
Also tried Holmes stereoscope with chart views plotted with T/NROFF on a Diablo Daisy wheel printer.)