I am experimenting a bit with displacement maps, and I am having a bit of a problem with the corners. In another thread I mentioned a tower I'm working on - here is the same model but with a displacement map. It looks ok for most of it, but as you can see, on the corners of the doors, it's just peeling the edges apart and leaving a gap. This is particularly obvious for the windowsill over on the left. Is there any other way to solve this other than ensure that the displacement maps are black (i.e. no displacement) on the corners?