The screenshot is from a run on an NVIDIA GTX 960M.

This program raycasts spheres without reflections. It uses a naive (i.e, wrong) lighting model where light is never blocked by other spheres.

fastcast tries to keep it simple, and is compiled into a single map kernel over the screen dimensions. There is also some bit fiddling just for the fun of it.

First run futhark pkg sync once.

Then run make to build and ./demo to run the default demo.

• Up/Down: Move forwards/backwards
• Left/Right: Turn left/right
• PageUp/PageDown: Move upwards/downwards
• Shift: Move four times faster
• Minus/Plus: Adjust the view distance to the virtual screen
• F1: Toggle stats showing

• Futhark
• SDL2 and SDL2-ttf with headers.