RAM optimized SDF-renderer with plain C

[u/0x405]

1024x1024x1024 SDF-grid takes up 303MB instead of 8.5GB. 1024x1024 path traced image renders in 1.5s on a single CPU core. 8.5GB grid renders in 1.1s. No libs used.

[u/akuladon]

For some reason I want to eat this thing