Greetings, Scratcher Your mouse pointer is the source of light. Move it around to see the shadows change in real time. Press spacebar, change the slider, and then press the green flag if you want to change the number of edges. The fewer the faster. Nothing out of the ordinary here, just a normal ray caster. Mhm, absolutely. Definitely not being sarcastic right now. Would I lie to you? On second thought, don't answer that. Just don't see inside, whatever you do.
All code by me, @CasTur