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Path tracer in Unity Engine, using techniques such as multiple importance sampling, TAA, EAW denoiser, SVGF denoiser, filed of depth, BVH, Disney BRDF, refraction etc.

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.vs/Path_Tracing/xs		.vs/Path_Tracing/xs
Assets		Assets
Packages		Packages
ProjectSettings		ProjectSettings
.DS_Store		.DS_Store
.gitattributes		.gitattributes
.gitignore		.gitignore
Assembly-CSharp.csproj		Assembly-CSharp.csproj
Path_Tracing.sln		Path_Tracing.sln
README.md		README.md

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(Caution: This repository is currently under active development and quite unstable. Be aware of this before cloning.)

Features:

Path Tracing
Multiple Importance Sampling, Russian Roulette
Spatiotemporal Variance-Guided Filter
Edge-avoiding À-Trous Wavelet Filter
Fireflies mitigation
Simple TAA
Field of Depth
BVH
Metallic workflow
Refraction, Disney BRDF, Phong
GBuffer
Skybox
Unity
Adjustable SPP/frame ((1 spp to 32 spp per frame)

Demo

path tracer + taa + skybox + metallic workflow + refraction

Multiple importance sampling

Less noisy and faster to converge when the light source is small.

Denoisers

SVGF is more temporally stable than EAW.

My.Movie.mp4

Todo

Material: albedo map, normal map etc
SVGF albedo demodulation and modulation after albedo maps are added

Reference

https://www.pbr-book.org/3ed-2018/contents

https://raytracing.github.io/books/RayTracingTheRestOfYourLife.html

Edge-avoiding a-trous wavelet transform for fast global illumination filtering.

https://bitbucket.org/Daerst/gpu-ray-tracing-in-unity/src/master/Assets/RayTracingMaster.cs