This is a path tracer I created for educational purposes. It’s based on the Ray Tracing in One Weekend book, but I’ve tried to make it faster by introducing SIMD intrinsics and multithreading. I’m using Apple’s GCD for multithreading. This implementation is up to 17x faster than the one in the book.
These numbers were recorded on an Apple M1 Pro.
Most of the heavy lifting is done by GCD, but the SIMD version alone gets a 3x improvement.
| Scene | Reference | This | Improvement |
|---|---|---|---|
| scene_big.inl at 500spp and 1200x675 resolution | 652s | 37s | 17x |
| scene_big.inl at 50spp and 1200x675 resolution | 65.5s | 3.85s | 17x |
| test_scene at 500spp and 1200x675 resolution | 62.15s | 4.6s | 13x |
| test_scene at 50spp and 1200x675 resolution | 6.48s | 480ms | 13x |
