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  Interactive Cloud Rendering Using Temporally-coherent Photon Mapping

Elek, O., Ritschel, T., Wilkie, A., & Seidel, H.-P. (2012). Interactive Cloud Rendering Using Temporally-coherent Photon Mapping. In S. Brooks, & K. Hawkey (Eds.), Graphics Interface 2012 (pp. 141-148). Toronto, Canada: Canadian Information Processing Society.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0014-F42E-8 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-2736-6
Genre: Conference Paper

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 Creators:
Elek, Oskar1, Author           
Ritschel, Tobias1, Author           
Wilkie, Alexander2, Author
Seidel, Hans-Peter1, Author           
Affiliations:
1Computer Graphics, MPI for Informatics, Max Planck Society, ou_40047              
2External Organizations, ou_persistent22              

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 Abstract: This paper presents an interactive algorithm for simulation of light transport in clouds. Exploiting the high temporal coherence of the typical illumination and morphology of clouds we build on volumetric photon mapping, which we modify to allow for interactive rendering speeds --- instead of building a fresh irregular photon map for every scene state change we accumulate photon contributions in a regular grid structure. This is then continuously being refreshed by re-shooting only a fraction of the total amount of photons in each frame. To maintain its temporal coherence and low variance, a low-resolution grid is used, and is then upsampled to the density field resolution in each frame. We also present a technique to store and reconstruct the angular illumination information by exploiting properties of the standard Henyey-Greenstein phase function, namely its ability to express anisotropic angular distributions with a single dominating direction. The presented method is physically-plausible, conceptually simple and comparatively easy to implement. Moreover, it operates only on the cloud density field, thus not requiring any precomputation, and handles all light sources typical for the given environment, i.e. where one of the light sources dominates.

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Language(s): eng - English
 Dates: 2012-05
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: Elek2012a
Other: Local-ID: 3CB9A3047BF33EE2C1257AF000674820-Elek2012a
 Degree: -

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Title: Graphic Interface 2012
Place of Event: Toronto, ON, Canada
Start-/End Date: 2012-05-28 - 2012-05-30

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Title: Graphics Interface 2012
  Abbreviation : GI 2012
  Subtitle : Proceedings ; 28 - 30 May 2012, Toronto, Ontario, Canada
Source Genre: Proceedings
 Creator(s):
Brooks, Stephen1, Editor
Hawkey, Kirstie1, Editor
Affiliations:
1 External Organizations, ou_persistent22            
Publ. Info: Toronto, Canada : Canadian Information Processing Society
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 141 - 148 Identifier: ISBN: 978-1-4503-1420-6
ISSN: 0713-5424