Crystal Raytracer

A raytracer ported from Ruby to Crystal, optimized to match Rust performance.

Original

Ported from github.com/edin/raytracer (Ruby version).

Performance

Renders a 500x500 image with reflections, shadows, and multiple colored lights:

Build

shards build --release -Dpreview_mt --mcpu=native --mcmodel=kernel

Run

CRYSTAL_WORKERS=16 ./bin/raytracer

Output: crystal-raytracer.png

Optimization Journey

See the blog post for the full story of how we got from Ruby to Rust-speed in Crystal.

License

MIT