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Feb 2004

Volume 115, Issue 2, pp. 431-929

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A beam tracing method for interactive architectural acoustics

Thomas Funkhouser, Nicolas Tsingos, Ingrid Carlbom, Gary Elko, Mohan Sondhi, James E. West, Gopal Pingali, Patrick Min, and Addy Ngan

J. Acoust. Soc. Am. Volume 115, Issue 2, pp. 739-756 (2004); (18 pages) | Cited 10 times

Online Publication Date: 30 Jan 2004

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A difficult challenge in geometrical acoustic modeling is computing propagation paths from sound sources to receivers fast enough for interactive applications. This paper describes a beam tracing method that enables interactive updates of propagation paths from a stationary source to a moving receiver in large building interiors. During a precomputation phase, convex polyhedral beams traced from the location of each sound source are stored in a “beam tree” representing the regions of space reachable by potential sequences of transmissions, diffractions, and specular reflections at surfaces of a 3D polygonal model. Then, during an interactive phase, the precomputed beam tree(s) are used to generate propagation paths from the source(s) to any receiver location at interactive rates. The key features of this beam tracing method are (1) it scales to support large building environments, (2) it models propagation due to edge diffraction, (3) it finds all propagation paths up to a given termination criterion without exhaustive search or risk of under-sampling, and (4) it updates propagation paths at interactive rates. The method has been demonstrated to work effectively in interactive acoustic design and virtual walkthrough applications. © 2004 Acoustical Society of America.
Show PACS
43.55.Ka Computer simulation of acoustics in enclosures, modeling
43.58.Ta Computers and computer programs in acoustics
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