GBRT

This is a project which aims to build an efficient photorealistic software renderer in Rust.
The project aims to provide an efficient implementation of a raytracing algorithm, with a focus on code readability and maintainability.
Here, I took a load of inspiration from "Ray Tracing in One Weekend" and the other books of the trilogy and as such, if you're interested in the topic of raytracing, I really suggest you to read them.

Features

General

• Written in Rust
• Developed for any OS
• Highly optimized using SSE and AVX intrinsics
• Parsing scene description from a YAML file -> You can also use https://threejs.org/editor/ to create your scene, by exporting and using the json2yaml.py script!
• Path Tracing with naive importance sampling (sampling both lights and material BSDF)

Geometry

• Bounding Volume Hierarchy (BVH) used for scene and mesh traversal
• Supported shape types: triangle meshes, sphere, box, rectangle

Lighting

• Supported light types: diffuse lights of any supported geometry

Materials

• Default materials supported: Metal, Lambertian, Dielectric, Plastic
• Transparency and refraction
• Normal mapping support

Textures

• Some very basic procedural textures
• 2D bitmap textures
• Supported file formats: all formats supported by the image-rs crate

Getting Started

To get started, clone the repository and run the following command in the root directory:

$ cargo run --release

This will build and run the project, and output a PNG image of the rendered basic scene. To render a custom scene defined by a yaml config file run the following:

$ cargo run --release -- configs/your_config.yaml

To build a more optimized version of the code you can also specify:

$ cargo run --release --target x86_64-pc-windows-msvc -- configs/your_config.yaml   # If you're running on Windows
$ cargo run --release --target x86_64-unknown-linux-gnu -- configs/your_config.yaml # If you're running on Linux

TODO list

• Working now on implementing support of light transport algorithms:
  • Bidirectional Path Tracing (with MIS)
• Working now on implementing support for:
  • Physically based BSDFs: diffuse, metal, dielectric, plastic
  • Cook-Torrance BSDF for specular reflection with GGX normal distribution
• Better material model and multilayer materials (e.g. introduce Disney-like "principled" material)
• Volumetric rendering
• Optimize traversal and shading with SSE/AVX [ Would probably mean a complete rewrite and as such is a very long term goal ]

Contributing

If you're interested in contributing to this project, please feel free to open a pull request or an issue regarding your ideas.

License

This project is licensed under the MIT License.