A physically based path tracer that runs in a GLSL fragment shader.
- Unidirectional path tracer
- RadeonRays for building BVHs (Traversal is performed in a shader)
- Disney BSDF
- OpenImageDenoise
- Texture Mapping (Albedo, Metallic-Roughness, Normal)
- Analytic Lights (Sphere, Rect, Directional) with MIS
- IBL
- Progressive + Tiled Rendering
- Load Scene from ui
- Load Environment Map from ui in hdr, exr formats
- Save image to png, tga, bmp, jpg, exr, hdr from ui
- Render fixed samples or fixed time and save image
- Control many paremeters of camera from keyboard
- Save image with samples interval or time interval periodically
- Parallel and optimised textures load
- Rotate environment map by X and Y
- Print current camera params
- Show samples and render time in window title
- Adaptive antialiasing (-aaa nsamples - adaptive antialiasing with nsamples maximum every pass)
Please see INSTALL-WIN.txt for the build instructions for Windows and INSTALL-LINUX.txt for Linux
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
| Key | Action |
|---|---|
| W / A / S / D | Move camera step forward, left, back, right |
| R / F | Move camera up/down |
| Mouse left | Look around |
| Mouse right | Camera forward/back |
| Mouse middle | Camera pan |
| Home / End | Adjust movement speed |
| Z / X | Adjust environment map emission |
| N / M | Rotate environment map by X |
| Y / H | Rotate environment map by Y |
| I / K / J / L | Rotate camera by X, Y |
| Arrow keys | Move camera |
| Page Up / Down | Move camera up/down |
| , / . | Change FOV |
| P | Print current camera params |
| Tab | Toggle UI visibility |
Use Ctrl-Shift for 100x step, Ctrl for 1/10 step, Alt for 1/2 step, Shift for 10x step
| Key | Action |
|---|---|
| -spp nsamples | Render nsamples, save file and exit |
| -time nseconds | Render nseconds, save file and exit |
| -saveEverySpp nsamples | Save image every nsamples |
| -saveEveryTime nseconds | Save image every nseconds |
| -addspp | Add to filename of image info about samples and time for -saveEverySpp, -saveEveryTime |
| -noRoughSpecDefMat | Set rougness=0 and specular=0 for default material. Rougness never 0, minimum 0.00025 |
| -o filename | Set output file name |
| -s scenename | Load scene to render |
| --scene scenename | Load scene to render |
| -aaa aaaPasses | Set adaptive sampling passes |
| -testAjax | Create predefined scene with 3 Ajax burstes |
| -testBoy | Create predefined scene with 4 "boy" objects |
- 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 really amazing renderer which has several features. A modified version of the scene description & loader are taken from here. Reference for MIS, light sampling
- 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
- Mitsuba Renderer (https://github.com/mitsuba-renderer/mitsuba) Reference for validation of the code.
- Erich Loftis's THREE.js PathTracer (https://github.com/erichlof/THREE.js-PathTracing-Renderer) Several amazing webgl examples including bidirectional path tracing; all running in a web browser.
- OptiX Introduction Samples (https://github.com/nvpro-samples/optix_advanced_samples/tree/master/src/optixIntroduction)