From a forum post (thanks Nicole!)
The strategy that I have adopted for creating secure spaces is to create a building with an outer shell and an inner core (or multiple inner cores if you want to have a floor with multiple rooms). The outer shell is the exterior of the building. Everyone sees this. You can put labels above the doors that say things like "restricted access for faculty only" or whatever. Then you create a room (inner core), as a separate model, that fits nicely inside the outer shell. This room needs to have doors and windows that match up exactly with the doors and windows of the outer shell. I found the best way to do this is to model everything together in SketchUp, grouping the outer shell objects together and the inner core objects together. Then you can extract each group and make it a separate .kmz file. Once you place the separate models in world and make sure they're aligned properly, you apply the following capabilities to the inner core room model:
- Container - make the room a container so security properties apply to all contents
- Security - restrict view access to everyone except allowed group
- Cone of Silence - make the space sound-proof
Now, if a person turns collision off, they will be able to walk into the space, but they will neither see nor hear anything that exists in that space. While this strategy works, I do think it's a better idea to make the door to the room a portal that only the allowed group can see and have the private space way off in the distance.
Now, for the open / closed door trick. Following the steps above, when you model the interior room, model it with an open door. When you model the outer shell, model it with no door, just an opening. Create a separate closed door model and use the placement tools in Wonderland to place this door in the opening of the outer shell. Then add the security capability to it. This time, deny view access to the group that is allowed view access to the inner room. That way, everyone not in the restricted group will see the closed door, but it will be hidden from view for the restricted group. Since they don't see the closed door, they will instead see the open door that is part of the inner room.