Thanks for the input chaps.
I've tested with layers. I've taken one room, manually selected all objects in that room, assigned them a layer called "Visible Room" and then used the camera in that room to only render "visible room"
Now this works well as I can no longer see the adjoining room, it's exactly what I am looking for. But, I need to find a way to use variables or something to change which objects are in the layer "visible room" and make that dynamic.
Otherwise, i'll have to manually select each object in each room, assign them onto a differently numbered layers, and this will mean I can only have 31 layers (rooms) in total, which won't be enough. Also, as I'm still in the process of designing the rooms, I'd have to keep manually defining the which objects are in the
layers when I make a change.
I think my programming/playmaker knowledge has reached its limit on this one! I'll have a stab at it over the weekend and see what I can come up with, any further suggestions/elaboration appreciated.