Voxel Path Tracer

An EXPERIMENTAL and UNFINISHED Voxel Path Tracing Engine which has an emphasis on performance and graphics. This engine was mostly made as an experiment and a tool to help me learn more about light transport, physically based rendering, volumetrics and intersection algorithms. This engine was coded from scratch using C++17 and the modern OpenGL programmable pipeline (OpenGL 4.5+ and GLSL version 430+ required).

Project status

This project has (mostly) been abandoned and new big features will not be worked on anytime soon. I intend to rewrite a voxel tracing engine in the future with much cleaner code/syntax and with newer and better acceleration structures so that larger and more detailed worlds can be rendered performantly!

Features Implemented

Rendering

Voxel Ray Casting
Manhattan distance field acceleration structure (Distance field generated using compute shaders on the GPU)
Deferred rendering pipeline

Lighting

Direct lighting based on the Cook torrance BRDF
Path traced lighting (Direct shadows, Global Illumination, Rough/Smooth reflections and Ambient Occlusion)
Spherical harmonic projection for indirect lighting
(Approximate) Screenspace Subsurface Scattering
Dynamic atmosphere/sky rendering
Relief Parallax Mapping

Denoising

Temporal Denoiser/Reprojection (used for Pathtraced Lighting, Volumetric Clouds and Antialiasing)
Screenspace Spatial Denoiser (SVGF, Atrous, Gaussian and other specialized denoisers for direct shadow/reflections)

Post Process

AO : SSAO
Misc : DOF, Bloom, Lens flare, Chromatic aberration, Basic SS god rays, night stars and nebula
Image : CAS
Anti Aliasing : FXAA, TXAA/TAA-U
Other Effects : Tonemapping, Gamma correction, color dithering, color grading, purkinje effect, film grain

Volumetrics

3D Volumetric Clouds (+ 2D cirrus cloud layer)
LPV for volumetrics from light sources (could be used for distant lighting or performant second bounce gi in the future)

Others

Basic Particle system
3D Sound
Material/Block database system (with around 100 block types with 512x512 textures (Albedo, normals, metalness, roughness, indirect occlusion & displacement))
Procedural Terrain Generation (Plains, superflat)
World saving/loading
Minecraft world loading

Half Implemented / WIP Features

Histogram based auto exposure
Anisotropic raytraced reflections (for materials such as brushed metal, based on Disney Principled BRDF)

Todo Features / QOL Improvements

Glass/water with stochastic refractions
Worldspace MIS

Performance Metrics

20 - 22 FPS on a Vega 8 iGPU on the default low preset. (@ 768p)
30 - 34 FPS on a Vega 11 iGPU on the default low preset. (@ 768p)
150 - 160 FPS on a GTX 1080Ti. (@ 1080p)

Note

This project is still very experimental, it is not a finished product as of yet.
This engine has NOT been tested on Intel GPUs/iGPUs.
This engine requires OpenGL 4.5, if the window fails to initialize, then there is a good chance that your GPU does not support the required OpenGL version.
If you want to report an issue/bug, then you can contact me on discord or, alternatively, via email. (See github profile page)
See Controls.txt for the controls (Or look at the console when you start up the program.)