Global Illumination using Parallel Global Ray-Bundles

Hermes, Jan; Henrich, Niklas; Grosch, Thorsten; Mueller, Stefan

Global Illumination using Parallel Global Ray-Bundles

Files

065-072.pdf (790.17 KB)

Date

2010

Authors

Hermes, Jan
Henrich, Niklas
Grosch, Thorsten
Mueller, Stefan

Publisher

The Eurographics Association

Abstract

A fast computation of unbiased global illumination is still an unsolved problem, especially if multiple bounces of light and non-diffuse materials are included. The standard Monte Carlo methods are time-consuming, because many incoherent rays are shot into the scene, which is hard to parallelize. On the other hand, GPUs can make the most of their computing power if the problem can be broken down into many parallel, small tasks. Casting global, parallel ray-bundles into the scene is a way of achieving this parallelism. We exploit modern GPU features to extract all intersection points along each ray within a single rendering pass. Radiance can then be transferred between pairs of all points which allows an arbitrary number of interreflections, especially for compelling multiple glossy reflections. Beside arbitrary BRDFs, our method is independent of the number of light sources and can handle arbitrary shaped light sources in a unified framework for unbiased global illumination. Since many methods exist for fast computation of direct light using soft shadows, we demonstrate how our method can be built on top of any direct light simulation.

        @inproceedings{:10.2312/PE/VMV/VMV10/065-072
,
booktitle = {Vision, Modeling, and Visualization (2010)
},
editor = {Reinhard Koch and Andreas Kolb and Christof Rezk-Salama
},
title = {{Global Illumination using Parallel Global Ray-Bundles
}},
author = {Hermes, Jan and 
Henrich, Niklas and 
Grosch, Thorsten and 
Mueller, Stefan
},
year = {2010
},
publisher = {The Eurographics Association
},
ISBN = {978-3-905673-79-1
},
DOI = {/10.2312/PE/VMV/VMV10/065-072
}
}