LarryG on 19/7/2015 at 13:20

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Whoops, you are right. :o

I was thinking room brushes but typed air brushes. My only defense is that many people don't use multiple room brushes per air brush, using the brush_to_room command.

About the portals ... in my muddled way I was attempting to describe two things. One, that if you have the line between the centroids of two room brushes pass through solid, then sound may not propagate properly. (EDIT: HA! They do call them portals!! Remember that old favorite: "WARNING: room brush with portal center outside the world"? That portal center is the mid-point between the room brush centroids, and the portal is the plane through that point in the intersection of the two room brushes. Double ha!) And two, that you need to have doors "close" to the intersection of two room brushes for the sound blocking of doors to work correctly. If you put a door inside a single room brush then there will be issues with that. So you should always use two room brushes per doorway.

Sorry for the muddles.