A button that chooses whether or not diffraction information should be computed for a mesh. This enables sound to propagate around that mesh. If disabled, no diffraction will occur around the mesh and the direct sound will be completely occluded when the source is not visible. It may be useful to only enable diffraction on large meshes (e.g. scene environment geometry), but to disable it on small props and clutter objects. This can improve the performance by reducing the total number of edges in the scene.