Screen Space Spherical Harmonic Occlusion
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
The Eurographics Association
Abstract
In this paper we present a new algorithm for real-time directional occlusion sampling. We combine the real-time capabilities of Screen Space Ambient Occlusion (SSAO) with the Spherical Harmonics (SH) representation of local directional occlusion. SH are well established and used in modern off-line rendering implementations such as PantaRay [PFHA10]. Through our combination we are able to transfer a method for realistic local directional occlusion effects from offline rendering to dynamic real-time applications. These local occlusion effects react to the environmental lighting situation and lead to dynamic and colored local occlusion shadows while only generating a small computational overhead compared to SSAO. Unlike other real-time directional occlusion algorithms such as Screen Space Direction Occlusion (SSDO) [RGS09] our occlusion sampling is separated from the actual lighting process and therefore can be easily integrated in existing SH lighting methods such as Irradiance Volumes [GSHG98]. We furthermore extend our algorithm to include first bounce indirect illumination effects.
Description
@inproceedings{:10.2312/PE/VMV/VMV12/071-078,
booktitle = {Vision, Modeling and Visualization},
editor = {Michael Goesele and Thorsten Grosch and Holger Theisel and Klaus Toennies and Bernhard Preim},
title = {{Screen Space Spherical Harmonic Occlusion}},
author = {Herholz, Sebastian and Schairer, Timo and Schilling, Andreas and Straßer, Wolfgang},
year = {2012},
publisher = {The Eurographics Association},
ISBN = {978-3-905673-95-1},
DOI = {/10.2312/PE/VMV/VMV12/071-078}
}