A comprehensive theory of volumetric radiance estimation using photon points and beams
ACM Transactions on Graphics (TOG)
A programmable system for artistic volumetric lighting
ACM SIGGRAPH 2011 papers
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We implemented the recent Photon Beams [Jarosz et al. 2011] algorithm in Photorealistic RenderMan to efficiently render artistically-directed volumetric lighting effects for the feature-length animated movie Tangled [Nowrouzezahrai et al. 2011]. Photon beams generalize volumetric photon mapping by storing the entire path of a photon instead of just the scattering location. Conceptually, each photon beam represents a truncated conical beam of light through the medium. Jarosz et. al formulated several ways to compute a radiance estimate from photon beams, promoting the so-called Beam x Beam 1D estimate which interprets each beam as a flat axial billboard.