Wwise Unity Integration

Define an outer radius around each sound position to simulate a radial sound source. The distance used for applying attenuation curves is taken as the distance between the listener and the point on the sphere, defined by the sound position and the outer radius, that is closest to the listener. The spread for each sound position is calculated as follows:

• If the listener is outside the outer radius, the spread is defined by the area that the sphere takes in the listener field of view. Specifically, this angle is calculated as 2.0*asinf( outerRadius / distance ), where distance is the distance between the listener and the sound position.
• When the listener intersects the outer radius (the listener is exactly outerRadius units away from the sound position), the spread is exactly 50%.
• When the listener is in between the inner and outer radius, the spread interpolates linearly from 50% to 100% as the listener transitions from the outer radius towards the inner radius. Note that transmission and diffraction calculations in Spatial Audio always use the center of the sphere (the position(s) passed into AK::SoundEngine::SetPosition or AK::SoundEngine::SetMultiplePositions) for raycasting. To obtain accurate diffraction and transmission calculations for radial sources, where different parts of the volume may take different paths through or around geometry, it is necessary to pass multiple sound positions into AK::SoundEngine::SetMultiplePositions to allow the engine to 'sample' the area at different points.