Real-Time Rendering of Rough Refraction

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...

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Bibliographic Details
Published in:IEEE transactions on visualization and computer graphics 2012-10, Vol.18 (10), p.1591-1602
Main Authors: de Rousiers, Charles, Bousseau, Adrien, Subr, Kartic, Holzschuch, Nicolas, Ramamoorthi, Ravi
Format: Article
Language:English
Subjects:
Approximation
bidirectional transmittance distribution function
Computer Science
Geometry
Graphics
Illumination
Lighting
Mathematical analysis
normal distribution function
Real time
Real time systems
Real-time rendering
Refraction
Rendering
Rough surfaces
Scattering
Studies
Surface roughness
translucent material
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Summary: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.
ISSN:1077-2626
1941-0506
DOI:10.1109/TVCG.2011.282