An implementation based on Ray Tracing in One Weekend by Peter Shirley[1] in Rust with CPU multithreading.

[1] http://www.realtimerendering.com/raytracing/Ray%20Tracing%20in%20a%20Weekend.pdf

Building

Linux (Debian based)

Assuming you have rustc 1.33 or newer already installed, install libsdl2-dev on your system:

$ sudo apt-get libsdl2-dev

Open Cargo.toml and remove build property (that's only for Windows).

Now simply go for:

$ cargo run --release

I strongly recommend running it on the release configuration, since it's optimized and runs at least 15x faster.

Windows (MSVC)

Assuming you have rustc 1.33 or newer already installed, download SDL2 runtime libraries from here, then extract all *.lib files to pathtracer-root\msvc\lib\64\*.lib and all the *.dll files to pathtracer-root\msvc\dll\64\*.lib, assuming you're running on a x86-64 environment. Otherwise, open src\build.rs and figure it out.

Now simply do:

> cargo run --release

I strongly recommend running it on the release configuration, since it's optimized and runs at least 15x faster.

Instructions

When a black window open, press SPACE and wait sometime for it to render.

You can change how many rays per pixel you want to cast, on src/tracer/mod.rs there's a global constant called SAMPLINGS_PER_PIXEL, it's set to 100 by default, but you can test how many rays you want.

Warning: be careful when running more than 100 rays per pixel, since it may get your computer really slow for a few minutes.