C2-Renderer

A simple webgpu renderer implemented with javascript and svelte

Web demo

Main features

1. Anisotropic Torrance-Sparrow BRDFs for conductors and dielectrics
2. Multi-scattering energy compensation LUTs for conductors and dielectrics
3. Beer-lambert volume absorption for dielectric materials
4. Simple Lambertian BRDF and Energy-preserving Oren Nayar diffuse BRDF model
5. Multiple importance sampling with either one-sample model (OSM) or next-event estimation (NEE)
6. Support for bump maps, albedo and roughness textures
7. Importance-sampled environment-maps with PiecewiseConstant2D constructs from pbrt v4, including switch between standard and compensated distributions
8. Camera model with support for tilt-shift and cat-eyed bokeh effects
9. Normal-view and camera-light previews
10. HDR envmap to PC2D conversion and export
11. Different types of samplers: Uniform, Halton, Blue noise and a customized "sequenced" version of the R2 sampler
12. 3 types of pixel-decorrelation strategies (none, random offset, blue noise mask)
13. Two types of integrator: a simple backward path tracer and ReSTIR-PT
14. ReSTIR-PT supports 3 types of generalized balance heuristic, Pairwise MIS (defensive variant) / complete GBH / Biased GBH
15. ReSTIR-PT also supports variable spatio-temporal filter sizes, pass & reuse candidates count

C2 implements research from:

1. EON: A practical energy-preserving rough diffuse BRDF
2. Practical multiple scattering compensation for microfacet models
3. R2 Low discrepancy sequence
4. Blue-noise Dithered Sampling
5. Multiple importance sampling
6. ReSTIR-DI
7. ReSTIR-GI
8. Generalized Resampled Importance Sampling