Wwise SDK 2021.1.14

The length of rays that are cast inside Spatial Audio. This effectively caps the maximum length of individual segments in reflection or diffraction paths. Each individual sound is also affected by its maximum attenuation distance, specified in the Authoring tool. Reflection or diffraction paths, calculated inside Spatial Audio, will never exceed a sound's maximum attenuation distance. Note, however, that attenuation is considered infinite if the furthest point is above the audibility threshold.

AkSpatialAudio.h の 65 行目に定義があります。