Wei-Feng Wayne Huang
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.
- 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/110.1145/3072959.3073665Google Scholar
Digital Library
- 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.xGoogle Scholar
- 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/110.1145/3072959.3073665Google Scholar
- 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/10.1145/3306346.3323025Google Scholar
- 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.13383Google ScholarCross Ref
- Florian Simon, Johannes Hanika, Tobias Zirr, and Carsten Dachsbacher. 2017. Line Integration for Rendering Heterogeneous Emissive Volumes. CGF (Proc. of Eurographics Symposium on Rendering) 36, 4 (July 2017), 101–110. https://doi.org/10.1111/cgf.13228Google Scholar
- Ryusuke Villemin and Christophe Hery. 2013. Practical Illumination from Flames. Journal of Computer Graphics Techniques 2, 2 (Dec. 2013), 142–155.Google Scholar
Index Terms
Unbiased Emission and Scattering Importance Sampling For Heterogeneous Volumes
Recommendations
Joint importance sampling of low-order volumetric scattering
Central to all Monte Carlo-based rendering algorithms is the construction of light transport paths from the light sources to the eye. Existing rendering approaches sample path vertices incrementally when constructing these light transport paths. The ...
ISHair: Importance Sampling for Hair Scattering
We present an importance sampling method for the bidirectional scattering distribution function (bsdf) of hair. Our method is based on the multi-lobe hair scattering model presented by Sadeghi et al. [SPJT10]. We reduce noise by drawing samples from a ...
Generalized resampled importance sampling: foundations of ReSTIR
As scenes become ever more complex and real-time applications embrace ray tracing, path sampling algorithms that maximize quality at low sample counts become vital. Recent resampling algorithms building on Talbot et al.'s [2005] resampled importance ...
Comments