Photon differentials
Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
A number of popular global illumination algorithms uses density estimation to approximate indirect illumination. The density estimate is performed on finite points - particles - generated by a stochastic sampling of the scene. In the course of the sampling, particles, representing light, are stochastically emitted from the light sources and reflected around the scene. The sampling induces noise, which in turn is handled by the density estimate during the illumination reconstruction. Unfortunately, this noise reduction imposes a systematic error (bias), which is seen as a blurring of prominent illumination features. This is often not desirable as these may lose clarity or vanish altogether. We present an accurate method for reconstruction of indirect illumination with photon mapping. Instead of reconstructing illumination using classic density estimation on finite points, we use the correlation of light footprints, created by using Ray Differentials during the light pass. This procedure gives a high illumination accuracy, improving the trade-off between bias and variance considerable as compared to traditional particle tracing algorithms. In this way we preserve structures in indirect illumination.
Original language | English |
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Title of host publication | Proceedings - GRAPHITE 2007, 5th International Conference on Computer Graphics and Interactive Techniques in Australasia and Southeast Asia |
Number of pages | 8 |
Publication date | 2007 |
Pages | 179-186 |
ISBN (Print) | 9781595939128 |
DOIs | |
Publication status | Published - 2007 |
Event | 5th International Conference on Computer Graphics and Interactive Techniques in Australasia and South-East Asia, GRAPHITE 2007 - Perth, WA, Australia Duration: 1 Dec 2007 → 4 Dec 2007 |
Conference
Conference | 5th International Conference on Computer Graphics and Interactive Techniques in Australasia and South-East Asia, GRAPHITE 2007 |
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Land | Australia |
By | Perth, WA |
Periode | 01/12/2007 → 04/12/2007 |
Sponsor | ACM SIGGRAPH |
Series | Proceedings - GRAPHITE 2007, 5th International Conference on Computer Graphics and Interactive Techniques in Australasia and Southeast Asia |
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- caustics, global illumination, photon mapping, ray differentials, ray-tracing
Research areas
ID: 306858736