WORT - a Week(end) Of Ray Tracing

This is yet another implemention of the Ray Tracing in One Weekend tutorial/book. The original implementation is in C++ so I translated the code in a hopefully idiomatic Rust, which I also learned in parallel.

Some extra features:

• Usage of simple framebuffer window (minifb) to draw the image and experiment with different diffuse methods via key presses
• Single threaded C++ implementation by Shirley is slightly faster (15.8s with either -02 or -03 optimizations) than single threaded Rust (18.6s) on the final random scene
• Rayon parallelizes tracing the ray along the X/width axis and gained 3.7-4 times speed up (5.3s)
• Rust lacks reflection so string-enum mapping and iterating had to be done via a custom crate strum

Running notes:

• Don't bother running the tracer in debug mode, as it's painfully slow
• Image output can be a PPM file or a framebuffer window
• There are a couple of CLI arguments, run --help to see or check the code out

TODO:

• Reported rendering time above is on 2015 MacBook Pro, but add times for i9-9900K (should be ~4 times faster?), and M1 silicon for an interesting comparison
• There are many parameters (such as camera positioning, FOV, dielectrics reflectivity, object poses, etc.) that can be made configurable via the framebuffer window or the CLI
• Implement the second and third part
• Play around with AVX/SIMD?
• ...