Two Methods for Fast Ray-Cast Ambient Occlusion

Simple item page
dc.contributor.authorLaine, Samulien_US
dc.contributor.authorKarras, Teroen_US
dc.date.accessioned2015-02-23T16:57:39Z
dc.date.available2015-02-23T16:57:39Z
dc.date.issued2010en_US
dc.description.abstractAmbient occlusion has proven to be a useful tool for producing realistic images, both in offline rendering and interactive applications. In production rendering, ambient occlusion is typically computed by casting a large number of short shadow rays from each visible point, yielding unparalleled quality but long rendering times. Interactive applications typically use screen-space approximations which are fast but suffer from systematic errors due to missing information behind the nearest depth layer.In this paper, we present two efficient methods for calculating ambient occlusion so that the results match those produced by a ray tracer. The first method is targeted for rasterization-based engines, and it leverages the GPU graphics pipeline for finding occlusion relations between scene triangles and the visible points. The second method is a drop-in replacement for ambient occlusion computation in offline renderers, allowing the querying of ambient occlusion for any point in the scene. Both methods are based on the principle of simultaneously computing the result of all shadow rays for a single receiver point.en_US
dc.description.number4en_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume29en_US
dc.identifier.doi10.1111/j.1467-8659.2010.01728.xen_US
dc.identifier.issn1467-8659en_US
dc.identifier.pages1325-1333en_US
dc.identifier.urihttps://doi.org/10.1111/j.1467-8659.2010.01728.xen_US
dc.publisherThe Eurographics Association and Blackwell Publishing Ltden_US
dc.titleTwo Methods for Fast Ray-Cast Ambient Occlusionen_US
Files
Collections
29-Issue 4
EGSR10: 21th Eurographics Symposium on Rendering