Very neat. Shameless plug: Things can get extremely minimal if you make the view frustum orthogonal and also use raymarching instead, then the geometry (SDF) is

Very neat. Shameless plug: Things can get extremely minimal if you make the view frustum orthogonal and also use raymarching instead, then the geometry (SDF) is very concise to define... a lot of the math disappears and the code gets super short... like 140 chars short: Spheres + Displacement https://www.dwitter.net/d/15947 https://www.dwitter.net/d/15951 Spheres Orbit + Fake Lighting https://www.dwitter.net/d/16192 "Smoke" (3D perlin-esc noise) https://www.dwitter.net/d/16179 https://www.dwitter.net/d/16169 Snowman + Snow https://www.dwitter.net/d/16955 Not very practical for much of an engine of course, and also much slower than casting, but it makes it dead easy to understand by removing matrix transforms et al.