Interactive cloud rendering using temporally coherent photon mapping

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10132503" target="_blank" >RIV/00216208:11320/12:10132503 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.cag.2012.10.002" target="_blank" >http://dx.doi.org/10.1016/j.cag.2012.10.002</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cag.2012.10.002" target="_blank" >10.1016/j.cag.2012.10.002</a>

Result language
angličtina
Original language name
Interactive cloud rendering using temporally coherent photon mapping
Original language description
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 forinteractive 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
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
IN - Informatics
OECD FORD branch
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Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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