Real-Time Rendering of Rough Refraction

C. de Rousiers, A. Bousseau, K. Subr, N. Holzschuch, R. Ramamoorthi

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

We present an algorithm to render objects made of transparent materials with rough surfaces in real-time, under all-frequency distant illumination. Rough surfaces cause wide scattering as light enters and exits objects, which significantly complicates the rendering of such materials. We present two contributions to approximate the successive scattering events at interfaces, due to rough refraction: First, an approximation of the Bidirectional Transmittance Distribution Function (BTDF), using spherical Gaussians, suitable for real-time estimation of environment lighting using preconvolution; second, a combination of cone tracing and macrogeometry filtering to efficiently integrate the scattered rays at the exiting interface of the object. We demonstrate the quality of our approximation by comparison against stochastic ray tracing. Furthermore we propose two extensions to our method for supporting spatially varying roughness on object surfaces and local lighting for thin objects.
Original languageEnglish
Pages (from-to)1591-1602
Number of pages12
JournalIEEE Transactions on Visualization and Computer Graphics
Issue number10
Publication statusPublished - Oct 2012


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