GLSL-PathTracer

A physically based path tracer that runs in a GLSL fragment shader.

Features

• Unidirectional path tracer
• Two-level BVH for instancing
• Disney BSDF
• Texture mapping (Albedo, Metallic-Roughness, Normal, Emission)
• Analytic lights (Spherical, Rectangular, Directional)
• Image based lighting
• Multiple importance sampling
• Tile rendering
• OpenImageDenoise
• Stochastic alpha testing
• MagicaVoxel style homogeneous volumes
• GLTF/GLB support (In progress)

Build Instructions

Please see INSTALL-WIN.txt for the build instructions for Windows and INSTALL-LINUX.txt for Linux

Sample Scenes

A couple of sample scenes are provided in the repository. Additional scenes can be downloaded from here: https://drive.google.com/file/d/1UFMMoVb5uB7WIvCeHOfQ2dCQSxNMXluB/view

Gallery

References/Credits

• A huge shout-out to Cedric Guillemet (https://github.com/CedricGuillemet) for cleaning up the code, adding the UI, integrating ImGuizmo, cmake and quite a lot of fixes.
• Tinsel Renderer (https://github.com/mmacklin/tinsel) A modified version of the scene description & loader from that project is used here.
• Ray Tracing in One Weekend (https://github.com/petershirley/raytracinginoneweekend) Peter Shirley's excellent book introductory book on raytracing which helped me get started on this project.
• Erich Loftis's THREE.js PathTracer (https://github.com/erichlof/THREE.js-PathTracing-Renderer).
• OptiX Introduction Samples (https://github.com/nvpro-samples/optix_advanced_samples/tree/master/src/optixIntroduction)
• Mitsuba Renderer (https://github.com/mitsuba-renderer/mitsuba) Reference for validation.
• PBRT-v3 (https://github.com/mmp/pbrt-v3) which provides an endless source of knowledge. The online book is a gift that keeps giving.
• Model links/credits are in the assets folder (See: Model Credits.txt)