Crumpling Sound Synthesis

摘要

Crumpling a thin sheet produces a characteristic sound, comprisedrnof distinct clicking sounds corresponding to bucklingrnevents. We propose a physically based algorithm that automaticallyrnsynthesizes crumpling sounds for a given thin shell animation.rnThe resulting sound is a superposition of individuallyrnsynthesized clicking sounds corresponding to visually significantrnand insignificant buckling events. We identify visually significantrnbuckling events on the dynamically evolving thin surfacernmesh, and instantiate visually insignificant buckling events via arnstochastic model that seeks to mimic the power-law distributionrnof buckling energies observed in many materials.rnIn either case, the synthesis of a buckling sound employs linearrnmodal analysis of the deformed thin shell. Because different bucklingrnevents in general occur at different deformed configurations,rnthe question arises whether the calculation of linear modes canrnbe reused. We amortize the cost of the linear modal analysis byrndynamically partitioning the mesh into nearly rigid pieces: thernmodal analysis of a rigidly moving piece is retained over time,rnand the modal analysis of the assembly is obtained via ComponentrnMode Synthesis (CMS). We illustrate our approach throughrna series of examples and a perceptual user study, demonstratingrnthe utility of the sound synthesis method in producing realisticrnsounds at practical computation times.