Online Photon Guiding with 3D Gaussians for Caustics Rendering
arxiv(2024)
摘要
In production rendering systems, caustics are typically rendered via photon
mapping and gathering, a process often hindered by insufficient photon density.
In this paper, we propose a novel photon guiding method to improve the photon
density and overall quality for caustic rendering. The key insight of our
approach is the application of a global 3D Gaussian mixture model, used in
conjunction with an adaptive light sampler. This combination effectively guides
photon emission in expansive 3D scenes with multiple light sources. By
employing a global 3D Gaussian mixture, our method precisely models the
distribution of the points of interest. To sample emission directions from the
distribution at any observation point, we introduce a novel directional
transform of the 3D Gaussian, which ensures accurate photon emission guiding.
Furthermore, our method integrates a global light cluster tree, which models
the contribution distribution of light sources to the image, facilitating
effective light source selection. We conduct experiments demonstrating that our
approach robustly outperforms existing photon guiding techniques across a
variety of scenarios, significantly advancing the quality of caustic rendering.
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