Did anybody has experiences with making a 3D room in PD. I need a patch which includes following options (or some of them): .) The room must have some significant points, like four corners. .) it must be possible to have the view of a spectator - eye view - so you can look around in the room.

Are you talking about a 3D audio room or a graphical room created with Gem? In the first case I have some stuff lying around, e.g. "listener
orientation and position vs. object position" stuff.

Cheers Soeren