Room Impulse Response Estimation Using Signed Distance Functions

Patrik Lechner
DAFx-2020 - Vienna (virtual)
There are several algorithms and approaches to Room Impulse Response (RIR) estimation. To the best of the author’s knowledge, there is no documentation of accuracy, speed, or even the feasibility of using signed distance functions (SDFs) in combination with sphere tracing for this task. A proof of concept with a focus on real-time performance is presented here, which still lacks many features such as frequency-dependent absorption and scattering coefficients, arbitrary source and receiver directives etc. The results are then compared to real room impulse responses and to a different simulation algorithm. Also, the rather special merits of such an approach, such as 4D reverberation and simple rounding of geometry, are briefly discussed and presented.