Precomputed Multiple Scattering for Light Simulation in Participating Medium

Beibei Wang (1, 2) , Nicolas Holzschuch (2)

1 NJUST - Nanjing University of Science and Technology
2 MAVERICK - Models and Algorithms for Visualization and Rendering

Illumination simulation involving participating media is computationally intensive. The overall aspect of the material depends on simulating a large number of scattering events inside the material. Combined, the contributions of these scattering events are a smooth illumination. Computing them using ray-tracing or photon-mapping algorithms is expensive: convergence time is high, and pictures before convergence are low quality. In this paper, we precompute the result of multiple scattering events, assuming an infinite medium, and store it in two 4D tables. These precomputed tables can be used with many rendering algorithms, such as Virtual Ray Lights (VRL), Unified Point Beams and Paths (UPBP) or Manifold Exploration Metropolis Light Transport (MEMLT), greatly reducing the convergence time. The original algorithm takes care of low order scattering (single and double scattering), while our precomputations are used for multiple scattering (more than two scattering events).

Keywords: Rendering; Participating Media; Multiple Scattering; Precomputation

Domains: Computer Science [cs]

Beibei Wang, Nicolas Holzschuch. Precomputed Multiple Scattering for Light Simulation in Participating Medium. Siggraph 2017 Talk, Jul 2017, Los Angeles, United States. pp.Article No. 35, ⟨10.1145/3084363.3085037⟩. ⟨hal-01522404⟩