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Bidirectional Photon Mapping Jiří Vorba Charles University in Prague Faculty of Mathematics and Physics 1
Motivation Goal: Robust Global Illumination Photon Mapping good at: Caustics Reflections of caustics Small light sources Photon Mapping bad at: Glossy scenes 2 © H.W.Jensen © Wojciech Jarosz
Our contribution 3 Photon Mapping
Outline Review of Photon Mapping (Jensen et al.) Main idea Algorithm overview Results Application to progressive methods Conclusion 4
Photon Mapping review First pass Photon shooting Overall lighting approximation © Kavita Bala 5
Photon Mapping review Second pass Light path connection heuristic 6 Primary rays BRDF lobe PM query Secondary rays
PM issues 1.Correlated queries 7
PM issues 2.Radiance estimate variance 8
Main idea PM query PM query PM query 9
1 st strategy PM query 10
2 nd strategy PM query 11
3 rd strategy PM query 12
Strategy combination Multiple importance sampling (Veach 97) 13
Algorithm overview First pass the same as in PM Second pass Path-Tracing Radiance estimate at every path vertex light path contribution multiplied by MIS weight 14
Results Photon Mapping Our Bidirectional Photon Mapping 15
Application to progressive methods (not a part of the CESCG article) Overcoming the memory limits Solving finer details Consistent method Our implementation Based on Stochastic Progressive PM 16
Progressive results 17 Our progressive bidirectional method Our bidirectional method (not progressive)
Results Photon MappingProgressive Bidirectional Photon Mapping 18
Reference - PT (320x320, 4 days on 6 cores) PBDPM (512x512, 1 day 3h on 6 cores) 19 Results
Limitation Bias introduced by an inappropriate MIS weights “gap” between a photon hit and a camera ray end point 20 PM query PM query Our assumption Reality
Conclusion Contribution New more robust photon mapping based method Future works “Area light source” strategy Compensate the bias introduced by inappropriate MIS weights 21
The end Thank you! Questions? Reference - PT (320x320, 4 days on 6 cores) PBDPM (512x512, 1 day 3h on 6 cores) 22
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