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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/14266

Title: Reflectance Model for Diffraction
Authors: Cuypers, Tom
Haber, Tom
Bekaert, Philippe
Oh, Se Baek
Raskar, Ramesh
Issue Date: 2012
Abstract: We present a novel method of simulating wave effects in graphics using ray-based renderers with a new function: the Wave BSDF (Bidirectional Scattering Distribution Function). Reflections from neighboring surface patches represented by local BSDFs are mutually independent. However, in many surfaces with wavelength-scale microstructures, interference and diffraction requires a joint analysis of reflected wavefronts from neighboring patches. We demonstrate a simple method to compute the BSDF for the entire microstructure, which can be used independently for each patch. This allows us to use traditional ray-based rendering pipelines to synthesize wave effects. We exploit the Wigner Distribution Function (WDF) to create transmissive, reflective, and emissive BSDFs for various diffraction phenomena in a physically accurate way. In contrast to previous methods for computing interference, we circumvent the need to explicitly keep track of the phase of the wave by using BSDFs that include positive as well as negative coefficients. We describe and compare the theory in relation to well-understood concepts in rendering and demonstrate a straightforward implementation. In conjunction with standard raytracers, such as PBRT, we demonstrate wave effects for a range of scenarios such as multibounce diffraction materials, holograms, and reflection of high-frequency surfaces.
Notes: [Cuypers, Tom; Haber, Tom; Bekaert, Philippe] Hasselt Univ, IUL IBBT, Experties Ctr Digital Media, Hasselt, Belgium. [Oh, Se Baek; Raskar, Ramesh] MIT, Cambridge, MA 02139 USA.
URI: http://hdl.handle.net/1942/14266
DOI: 10.1145/2231816.2231820
ISI #: 000308656700004
ISSN: 0730-0301
Category: A1
Type: Journal Contribution
Validation: ecoom, 2013
Appears in Collections: Research publications

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