Rusteray

00:07:36 - 2000 samples per pixel

Rusteray, a physically based path tracer written in Rust.

Features

• BRDF support: Lambertian, Oren-Nayar
• Multithreaded with a threadpool
• Denoising support via Intel OpenImageDenoise
• JSON config
• gltf2 model support

Showcase

~00:00:08 - 10 samples per pixel

~00:00:16 - 10 samples per pixel, denoised, no aux buffers

TODOs

• .gltf2 scene support?
  • support .gltf2 BRDF and materials?
  • config.json
    • frames to render
    • denoising or not
    • scene background color
      • scene background color gradient?
      • scene background atmosphere modeling?
  • scene(s) to load?
  • BSDFs on which model (mapping)?
• Explicit light sampling / next event estimation
• Diffuse & Specular BRDF support on materials?
  • Unify BSDF = BRDF + BTDF?
  • Bi-directional Transmission Distribution Function support (BTDF)?
  • Subsurface scattering BRDF support?
  • Model volume support
• Russian roulette termination (min bounds?)
• Statistics
  • Number of rays launched
  • Number of bounces
• Moveable camera
• Textures?

Config.json documentation

{
    "progress_bar": true,                                    // FIXME: Not implemented
    "denoise": false,                                        // FIXME: Not implemented
    "window_width": 600,
    "window_height": 600,
    "frames_to_render": 20,                                  // FIXME: Not implemented
    "quit_after_render": false,                              // FIXME: Not implemented
    "save_rendered_image_path": "",                          // NOTE: Relative to the executable
    "ray_samples_per_pixel": 25,
    "ray_max_depth": 10,
    "scene_paths": ["/models/cornell_box/cornell_box.obj"],  // NOTE: Relative to the executable
    "scene_background_color": [0.5, 0.7, 1.0],               // NOTE: RGB format [0, 1.0]
    "camera_position": [0.0, 1.0, 3.1],
    "camera_direction": [0.0, 1.0, 0.0],
    "camera_fov": 50.0                                       // NOTE: Degrees
}

Example of default value config.

References

• Ray Tracing: In One Weekend by Peter Shirley.
• Real-Time Rendering 4th edition by Akenin-Möller, Haines, et al.
• Physically Based Rendering by Matt Pharr.
• Oren-Nayar BRDF publication

License

MIT License

Copyright (c) 2020 Alexander Lingtorp

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.