Bidirectional Path Tracing II CS295, Spring 2017 Shuang Zhao - PowerPoint PPT Presentation

Jun 27, 2023 •578 likes •726 views

Bidirectional Path Tracing II CS295, Spring 2017 Shuang Zhao Computer Science Department University of California, Irvine CS295, Spring 2017 Shuang Zhao 1 Last Lecture Bidirectional path tracing CS295, Spring 2017 Shuang Zhao 2

Bidirectional Path Tracing II CS295, Spring 2017 Shuang Zhao Computer Science Department University of California, Irvine CS295, Spring 2017 Shuang Zhao 1
Last Lecture • Bidirectional path tracing CS295, Spring 2017 Shuang Zhao 2
Today’s Lecture • Bidirectional path tracing II CS295, Spring 2017 Shuang Zhao 3
Recap: Building Paths in Batches • Then, connecting each pair of vertices y s , z t yields a full path sample • ( n L n E ) full path samples constructed from one pair of light and sensor sub-paths CS295, Spring 2017 Shuang Zhao 4
Recap: Path Contribution • Given a light sub-path with n L vertices and a sensor sub-path wit n E vertices, each resulting path sample with has contribution: where CS295, Spring 2017 Shuang Zhao 5
Special Case: s = 0, 1 No visibility term in Simple path tracing Path tracing with next-event estimation CS295, Spring 2017 Shuang Zhao 6
Special Case: t = 0, 1 No visibility term in Simple adjoint particle tracing Adjoint particle tracing with next-event estimation CS295, Spring 2017 Shuang Zhao 7
Survival Probability and Albedo • Assuming Reflectance albedo then implies and CS295, Spring 2017 Shuang Zhao 8
Image Construction D D(u, v) • The value I j for pixel j equals • D is the image plane (parameterized using u , v ) • • h j is the filter function (e.g., 2D Gaussian) • I ( u , v ) is the image function CS295, Spring 2017 Shuang Zhao 9
Example Scene CS295, Spring 2017 Shuang Zhao 10
Individual Components CS295, Spring 2017 Shuang Zhao 11
Individual Components (Weighted) CS295, Spring 2017 Shuang Zhao 12
Next Lecture • Refraction & Bidirectional Scattering Functions • Radiative transfer CS295, Spring 2017 Shuang Zhao 13

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