💡 Lux-GI

Hybrid GI solution, based on DDGI ( include Ray-Tracing and SDF-Tracing )

The project is a Hybrid GI solution, partly inspired by Lumen and DDGI. The main core idea is to provide a complete GI solution (including Indirect-Light, Infinite-Bounce, Emissive-Lighting, Glossy-Reflection, Shadow, AO) that can run on both Raytracing-supported and non-raytracing hardware. Due to the shortage of time, there are still some performance issues in this project, but as a throwaway, I believe it can provide some new ideas to most of the people who are interested in GI.

Left is SDF-On, Right is Raytracing-On

Showcase

• BiliBili

• YouTube

Document

English-Version

中文版

Main Features

• Hybrid rendering and Global Illumination
  • using Raytracing and SDF-Tracing to make DDGI in realtime
  • Surface Cache for SDF Material representation
  • Deferred-Shading
  • SDF/Ray tracing reflection
  • SDF/Ray tracing soft shadow
  • SVGF denoiser
  • Standard PBR with GGX and roughness/metalness
• ECS IoC Container
  • Data Driven ECS architecture
  • Auto Injection ECS System(based on entt)
• RHI Interface
  • Vulkan 1.3
  • SPIR-V reflection

Compile

• Windows
  • 1. Click gen_build_win.bat
  • 2. Choose Game as main project
  • 3. Building with RelWithDebInfo
• Linux
  • Not support now
• Mac
  • Not support now

Controls in the Game app

• WSAD, QE - movement
• Mouse + Right Button - rotate the camera
• Shift - move faster

Acknowledgments

This project is made with lots of awesome open-source code, they are

• RTXGI, the fully raytracing DDGI implementation.

• cereal, A C++11 library for serialization.

• entt, high performance ECS library

• glad, an vulkan/opengl function loader

• glfw, open source, multi-platform library for OpenGL, OpenGL ES and Vulkan application development

• imgui, is a bloat-free graphical user interface library for C++

• libacc, About Acceleration structure library (BVH-, KD-Tree) with basic parallel construction

• hybrid-rendering, provide raytracing and denoise.

• spriv-cross, SPIRV-Cross is a tool designed for parsing and converting SPIR-V to other shader languages.

• tracer, c++ crash tracer.

• glm, OpenGL Mathematics (GLM) is a header only C++ mathematics library for graphics software.

• spdlog, Very fast, header-only/compiled, C++ logging library

• stb, single-file public domain (or MIT licensed) libraries for C/C++

• flax-engine, open source game engine. provide the idea how to generate and trace sdf.

Also Paper Reference

• Lumen-SIGGRAPH-2022

• DDGI-Website

• DDGI-Paper

• Surface Cache

• Blue noise and Sobol sequence

• Importance Sampling

• Soft-Shadow based on ray tracing method

• Gaussian-blur

• Bilateral_filter

• Spatiotemporal Variance-Guided Filtering

• Atrous

Star History