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Modeling wavelength-dependent BRDFs as factored tensors for real-time spectral rendering

: Schwenk, Karsten; Kuijper, Arjan; Bockholt, Ulrich

Institute for Systems and Technologies of Information, Control and Communication -INSTICC-, Setubal:
VISIGRAPP 2010, International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications. Proceedings. CD-ROM : Angers, France May 17 - 21, 2010
Porto: INSTICC Press, 2010
ISBN: 978-989-674-028-3
International Conference on Computer Vision Theory and Applications (VISAPP) <5, 2010, Angers>
Conference Paper
Fraunhofer IGD ()
realtime rendering; color model; Bidirectional Reflection Distribution Functions (BRDF)

Spectral rendering takes the full visible spectrum into account when calculating light-surface interaction and can overcome the well-known deficiencies of rendering with tristimulus color models. In this paper we show how to represent wavelength-dependent BRDFs as factored tensors. We use this representation for realtime spectral rendering on modern graphics hardware. Strong data compression and fast rendering times are achieved for mostly diffuse and moderately glossy isotropic surfaces. The method can handle high-resolution tabulated BRDFs, including non-reciprocal ones, which makes it well-suited for measured data. We analyze our approach numerically and visually. One area of application for our research is virtual design applications that require high color fidelity at interactive frame rates.