动态全局光照和 Luman
Global illumination

Monte Carlo Integration
Sampling is the key
Uniform Sampling 均匀采样
PDF 采样

Reflective Shadow Maps (RSM)
Light Propagation Volumes (LPV)

Sparse Voxel Octree for Real-time Global illumination (SVOGI)
Cone Tracing
Voxelization Based Global illumination (VXGI)

Problem
Screen Space Global illumination(SSGI)
Lumen
Fast Ray Trace in Any Hardware
SDF 光线追踪
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