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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. Computers & Graphics, 36(8), 1109-1118. doi:10.1016/j.cag.2012.10.002.

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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 work presents a novel 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 initially used, and is then upsampled to the density field resolution on a physical basis in each frame. We also present a technique to store and reconstruct the angular illumination information by exploiting properties of the standard Henyey-Greenstein 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 above 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: 2012-01-172012
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.cag.2012.10.002
BibTex Citekey: Elek2012b
Other: 5A3491A9878A9FE9C1257AF0006BC7A4-Elek2012b
 Degree: -

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Title: Computers & Graphics
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 36 (8) Sequence Number: - Start / End Page: 1109 - 1118 Identifier: ISSN: 0097-8493