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Illuminating and Rendering Heterogeneous Participating Media in Real Time using Opacity Propagation

Abstract : We present a new approach to illuminate and render single scattering effects in heterogeneous participating media in real time. The medium's density is modeled as a sum of radial basis functions, and is then sampled into a first volumetric grid. We then integrate the extinction function from each light source to each cell in the volume by a fast cell-to-cell propagation process on the GPU, and store the result in a second volume. We finally render both scattering medium and surfaces using a regular step ray-marching from the observer to the nearest surface. As we traverse the medium, we fetch data from both volumes and approximate a solution to the scattering equation. Our method is real-time, easy to implement and to integrate in a larger pipeline.
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https://hal-upec-upem.archives-ouvertes.fr/hal-00681747
Contributor : Venceslas Biri <>
Submitted on : Thursday, March 22, 2012 - 11:52:58 AM
Last modification on : Wednesday, February 26, 2020 - 7:06:06 PM
Long-term archiving on: : Saturday, June 23, 2012 - 2:25:47 AM

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  • HAL Id : hal-00681747, version 1

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Anthony Giroud, Venceslas Biri. Illuminating and Rendering Heterogeneous Participating Media in Real Time using Opacity Propagation. International Conference on Computer Graphics Theory and Applications GRAPP'11, Jun 2011, Portugal. pp.113-118. ⟨hal-00681747⟩

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