Not bad - this engine take's the formulas like a champ! ;-) Use the mouse to look around - yes, it's a bit strange to use a 2-axis system to control a 3-axis model, but it kinda works?! ;-)
Formula from: http://paulbourke.net/geometry/klein/ Thanks to @Zro716 for the "challenge" and his version https://scratch.mit.edu/projects/71825708/
