Calculations for in-depth reflection analysis – Stochastic and Deterministic Ray Tracing methods

Ray Tracing Impacts

The (find) Ray Tracing Impacts feature of EASE is a stochastic approach to model the propagation of sound in the room, giving you the opportunity of performing a comprehensive analysis of reflections that are detected at specific spots – i.e. at Listener Seat locations.

This approach uses a Monte Carlo simulation method, and in contrast with the simple Ray Tracing technique, here the number of particles (rays) is a fundamental factor, determining simulation accuracy and the repeatability of the results. In many cases 100,000 particles or more are used, although EASE is capable of generating higher figures if needed.   

Also in this module you are able to view the ray’s path and information, just as in the simple Ray Tracing feature. But in addition, now you can identify the specific surfaces that are hit before the sound gets to a particular seat, and check the corresponding ray’s minutiae.

This essential utility registers information for those rays that pass within a meter of a chosen point, e.g. a Listener Seat, and for each point individually. The detailed data – ray arrival time, reflection order, direction of incidence and energy level for all 21 frequency bands covered by EASE - can then be sent to other EASE modules, such as the Probe and EARS programs, so that post-processing, in-depth investigations, analysis of several objective acoustical parameters and critical evaluation of subjective impression can be performed.

Mirror Image Impacts

This tool also starts a calculation that looks for all rays that hit specific points (Listener Seats) within the room, so that Impact files for in-depth analysis can be generated and each ray can be analyzed.

However, unlike Ray Tracing Impacts, Mirror Image Impacts is a deterministic (Image Source) model, leaving nothing to chance!

100% of rays that would hit a selected seat within a pre-determined cut-off limit are found!

It is the most accurate approach, also generating exact temporal information.

This method can be considerably faster than the stochastic Ray Tracing routine, as long as reflections of low orders, or a relatively small number of surfaces are considered. However, the calculation time increases significantly with the reflection order and the number of surfaces. Because of this and the inability of the algorithm to account for scattering effects, large and complex rooms are generally investigated using Ray Tracing Impacts or the AURA raytracing module.