If you take a bar and rotate it through an angle at a distance, it passes through a plane in a hyperbola. This perhaps surprising fact is demonstrated here.
Pygame.org account Comments
David Rygmyr 2016-02-19 18:58:30
I would like to build one of these, as illustrated in this video:
The math is beyond what I can do; any chance I could get a hand creating DXF files to work with?