Contribution
Efficient Acoustic Radiosity Modelling for Precise Bi-directional Reflectance Distribution Patterns
* Presenting author
Abstract:
Auralization of sound sources in outdoor spaces faces challenges not found in traditional room acoustics models. In particular, the late sound reflections and reverberation tail cannot be practically simulated by typical image source models or ray-tracing. Due to open regions in the outdoor geometries, the impulse responses are rather sparse. In our work, we develop an acoustic radiosity model as means to comprehensively account for all the scattered energy interactions between surfaces in the geometry, circumventing the shortcomings of ray tracing applied in open environments. Radiosity methods have been found effective in the simulation of diffusely reflecting surfaces for both indoor and outdoor scenarios. We extend the traditional acoustic radiosity models beyond the perfectly diffuse case, with precise bi-directional reflectance distribution functions (BRDFs). To this end, a special architecture for the data management of our simulations is developed. The inclusion of high-precision BRDFs also requires deterministic, high precision computations, as opposed to more common stochastic approaches. Computational efficiency is central to our development philosophy, making our software more user-friendly.