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The treble GA solver is capable of modelling the directive characteristics of sources. Currently, the directivity is modelled with magnitude only, pr octave band for both the pressure-based ISM and the ray-radiosity(RR) solver.

In the ISM the directivity is taken into account pr reflection path, where the response of the source in a given direction is created using an octave band filtered frequency response.

For the RR solver we are tracing the energy in octave bands, so the directivity is taken into account by scaling the energy when the radiosity rays are created, based on the initial direction.