"Volume Scattering Probability Guiding" (Xu et al. Proceedings of SIGGRAPH Asia 2024) looks interesting:
https://kehanxuuu.github.io/vspg-website/
Volumetric scattering is a significant expense in Avoyd's path tracer, so if I get time to look into & implement this it could be very helpful.
[#]Rendering #Volume #SIGGRAPH
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