ReferencedPathTracing

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as the ground-truth of GlobalIllumination

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open problem:emissive meshes
ref:
https://github.com/NVIDIA-RTX/RTXPT
https://github.com/NVIDIAGameWorks/Falcor
https://www.nvidia.com/zh-tw/on-demand/session/gtcspring23-s51871/

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support transparency

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support volumetric