Unity-DDGI

Unity implementation of Dynamic Diffuse Global Illumination (DDGI).

Tech

Engine: Unity
Language: C# + HLSL
Rendering: Compute shaders
Technique: DDGI probe-based GI

Features

• Raytraced irradiance probe updates
• Probe border operations for seamless sampling
• Visibility and irradiance texture management
• Rasterized and raytraced rendering paths
• Bilinear interpolation for probe sampling

Implementation

Multiple compute shaders handle different stages:

• DDGIComputeRays.compute - Ray generation
• DDGIUpdateIrradianceProbes.compute - Probe updates
• ProbesBorderOperations.compute - Border handling
• DDGIRaytracedRendering.compute - Final rendering

Status

Warning

Development at a stall, significant light leaks remain to fix

References

Based on Sebastian Lague's Ray Tracing tutorial. Original implementation demonstrates GPU-accelerated path tracing in Unity using compute shaders.

And for the DDGI part, on NVIDIA's DDGI technique for real-time global illumination.