🤖 AI Summary
Existing virtual acoustic simulation methods struggle to simultaneously achieve physical accuracy for low-frequency phenomena—such as diffraction and interference—and real-time performance. This paper proposes a hybrid acoustic modeling framework based on two-dimensional finite-difference time-domain (2D FDTD) simulation, tightly integrated with Unreal Engine’s audio rendering pipeline. Scene geometry is projected to generate obstacle masks and boundary conditions; sine-swept excitation combined with deconvolution is employed to extract spatially resolved, multi-channel impulse responses. To our knowledge, this is the first end-to-end integration of a Python-based FDTD wavefield solver with a commercial game engine’s real-time audio system. The framework supports dynamic occlusion, reflection, diffraction, and interference while preserving physical fidelity. Experimental validation confirms that the computed impulse responses align closely with theoretical predictions. Results demonstrate significant improvements in spatial audio realism and immersion for VR and interactive media applications.
📝 Abstract
Accurate sound propagation simulation is essential for delivering immersive experiences in virtual applications, yet industry methods for acoustic modeling often do not account for the full breadth of acoustic wave phenomena. This paper proposes a novel two-dimensional (2D) finite-difference time-domain (FDTD) framework that simulates sound propagation as a wave-based model in Unreal Engine, with an emphasis on capturing lower frequency wave phenomena, embedding occlusion, diffraction, reflection and interference in generated impulse responses. The process begins by discretizing the scene geometry into a 2D grid via a top-down projection from which obstacle masks and boundary conditions are derived. A Python-based FDTD solver injects a sine sweep at a source position, and virtual quadraphonic microphone arrays record pressure field responses at pre-defined listener positions. De-convolution of the pressure responses yields multi-channel impulse responses that retain spatial directionality which are then integrated into Unreal Engine's audio pipeline for dynamic playback. Benchmark tests confirm agreement with analytical expectations, and the paper outlines hybrid extensions aimed at commercial viability.