DGTest

Back in the early 90:s I was trying to understand how to draw three dimensional computer images. I knew nothing about trigonometry and there was no Internet.

References https://www.scratchapixel.com/lessons/3d-basic-rendering/introduction-to-ray-tracing/how-does-it-work.html https://www.gamers.org/dEngine/rsc/

Perspective: https://www.gamers.org/dEngine/rsc/pcgpe-1.0/perspect.txt