This project was developed for fun while Nelua was being created. Ray tracing in realtime on the CPU is hard and tackling this problem was interesting to check out the efficiency of Nelua language.
This is highly inspired on the Ray Tracing in One Weekend tutorial but with some personal customizations.
Use ASWDQE keys to walk and arrows to rotate the camera.
A demo with half resolution compiled with emscripten is available at https://edubart.github.io/lunray/ Your browser needs WASM support to run, note that this is running on the CPU inside the browser so slowness is expected, on my browser I get about ~11 FPS.
With Nelua and SDL2 libs installed just do:
git clone https://github.com/edubart/lunray && cd lunray
nelua --maximum-performance lunray.nelua
For higher FPS uncomment the OPENMP = true line on lunray.nelua to enable
multi-threading rendering. I get about ~18 FPS on the screenshot generated above.