Rendering Participating Media Using Path Graphs
arxiv(2024)
摘要
Rendering volumetric scattering media, including clouds, fog, smoke, and
other complex materials, is crucial for realism in computer graphics.
Traditional path tracing, while unbiased, requires many long path samples to
converge in scenes with scattering media, and a lot of work is wasted by paths
that make a negligible contribution to the image. Methods to make better use of
the information learned during path tracing range from photon mapping to
radiance caching, but struggle to support the full range of heterogeneous
scattering media. This paper introduces a new volumetric rendering algorithm
that extends and adapts the previous path graph surface rendering
algorithm. Our method leverages the information collected through
multiple-scattering transport paths to compute lower-noise estimates,
increasing computational efficiency by reducing the required sample count. Our
key contributions include an extended path graph for participating media and
new aggregation and propagation operators for efficient path reuse in volumes.
Compared to previous methods, our approach significantly boosts convergence in
scenes with challenging volumetric light transport, including heterogeneous
media with high scattering albedos and dense, forward-scattering translucent
materials, under complex lighting conditions.
更多查看译文
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要