“Unbiased Emission and Scattering Importance Sampling For Heterogeneous Volumes” by Huang, Kutz, Li and Chiang

  • ©Wei-Feng Wayne Huang, Peter Kutz, Yining Karl Li, and Matt Jen-Yuan Chiang

  • ©Wei-Feng Wayne Huang, Peter Kutz, Yining Karl Li, and Matt Jen-Yuan Chiang

  • ©Wei-Feng Wayne Huang, Peter Kutz, Yining Karl Li, and Matt Jen-Yuan Chiang

Conference:


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Entry Number: 18

Title:

    Unbiased Emission and Scattering Importance Sampling For Heterogeneous Volumes

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Abstract:


    We present two new distance-sampling methods for production volume path tracing. We extend the null-collision integral formulation to efficiently gather heterogeneous volumetric emission, achieving higher-quality results. Additionally, we propose a tabulation-based approach to importance sample volumetric in-scattering through a spatial guiding data structure. Our methods improve the sampling efficiency for scenarios where low-order heterogeneous scattering dominates, which tends to cause high variance renderings with existing null-collision methods.

References:


    Brent Burley, David Adler, Matt Jen-Yuan Chiang, Hank Driskill, Ralf Habel, Patrick Kelly, Peter Kutz, Yining Karl Li, and Dan Teece. 2018. The Design and Evolution of Disney’s Hyperion Renderer. ACM Transactions on Graphics 37, 3, Article 33 (Aug. 2018). https://doi.org/110.1145/3072959.3073665

    Christopher Kulla and Marcos Fajardo. 2012. Importance Sampling Techniques for Path Tracing in Participating Media. CGF (Proc. of Eurographics Symposium on Rendering) 31, 4 (June 2012), 1519–1528. https://doi.org/10.1111/j.1467-8659.2012.03148.x

    Peter Kutz, Ralf Habel, Yining Karl Li, and Jan Novák. 2017. Spectral and Decomposition Tracking for Rendering Heterogeneous Volumes. ACM Transactions on Graphics (Proc. of SIGGRAPH) 36, 4, Article 111 (July 2017). https://doi.org/110.1145/3072959. 3073665

    Bailey Miller, Iliyan Georgiev, and Wojciech Jarosz. 2019. A Null-Scattering Path Integral Formulation of Light Transport. ACM Transactions on Graphics (Proc. of SIGGRAPH) 38, 4, Article 44 (July 2019). https://doi.org/10.1145/3306346.3323025

    Jan Novák, Iliyan Georgiev, Johannes Hanika, and Wojciech Jarosz. 2018. Monte Carlo Methods for Volumetric Light Transport Simulation. Computer Graphics Forum (Proc. of Eurographics) 37, 2 (May 2018), 551–576. https://doi.org/10.1111/cgf.13383

    Florian Simon, Johannes Hanika, Tobias Zirr, and Carsten Dachsbacher. 2017. Line  Integration for Rendering Heterogeneous Emissive Volumes. CGF (Proc. of Euro- graphics Symposium on Rendering) 36, 4 (July 2017), 101–110. https://doi.org/10.  1111/cgf.13228

    Ryusuke Villemin and Christophe Hery. 2013. Practical Illumination from Flames. Journal of Computer Graphics Techniques 2, 2 (Dec. 2013), 142–155.

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