Importance Sampling Techniques for Path Tracing in Participating Media

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dc.contributor.authorKulla, Christopheren_US
dc.contributor.authorFajardo, Marcosen_US
dc.contributor.editorFredo Durand and Diego Gutierrezen_US
dc.date.accessioned2015-02-28T07:36:06Z
dc.date.available2015-02-28T07:36:06Z
dc.date.issued2012en_US
dc.description.abstractWe introduce a set of robust importance sampling techniques which allow efficient calculation of direct and indirect lighting from arbitrary light sources in both homogeneous and heterogeneous media. We show how to distribute samples along a ray proportionally to the incoming radiance for point and area lights. In heterogeneous media, we decouple ray marching from light calculations by computing a representation of the transmittance function that can be quickly evaluated during sampling, at the cost of a small amount of bias. This representation also allows the calculation of another probability density function which can direct samples to regions most likely to scatter light. These techniques are orthogonal and can be combined via multiple importance sampling to further reduce variance. Our method has very modest per-ray memory requirements and does not require any preprocessing, making it simple to integrate into production ray tracing based renderers.en_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.description.volume31
dc.identifier.doi10.1111/j.1467-8659.2012.03148.x
dc.identifier.issn1467-8659en_US
dc.identifier.urihttps://doi.org/10.1111/j.1467-8659.2012.03148.xen_US
dc.publisherThe Eurographics Association and Blackwell Publishing Ltd.en_US
dc.subjectI.3.7 [Computer Graphics]en_US
dc.subjectThree Dimensional Graphics and Realismen_US
dc.subjectRadiosityen_US
dc.titleImportance Sampling Techniques for Path Tracing in Participating Mediaen_US
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EGSR12: 23th Eurographics Symposium on Rendering