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An immersive audio-visual experience in games and virtual reality requiresfast calculation of diffraction-based acoustic effects. To maintainplausibility, the effects must retain spatial smoothness on source and listenermotion within geometrically complex scenes. Precomputed wave-based techniquescan render such results at low runtime CPU cost, but remain limited to staticscenes. Modeling the occlusion effect of dynamic portals such as doors presentan unresolved challenge to maintain audio-visual consistency. We present a fastsolution implementable as a drop-in extension to existing precomputed systems.Key is a novel portal-search method that leverages precomputed propagationdelay and direction data to find portals intervening the diffracted shortestpath connecting dynamic source and listener at runtime. The method scaleslinearly with number of portals in worst case, far cheaper than explicit globalpath search that scales with scene area. We discuss culling techniques toaccelerate further. The search algorithm is combined with geometric-acousticapproximations to model the additional direct and indirect energy loss fromintervening portals depending on their dynamic closure state. We demonstrateplausible audio-visual animations within our system integrated with UnrealEngine 4 (TM) and AudioKinetic Wwise (TM).

Dynamic Portal Occlusion for Precomputed Interactive Sound Propagation