I'm having pretty good luck using the surface baking cameras to export light maps. I've got animation working so each frame uses a different camera, and I'm exporting buffers so that I've got lightmaps saved. One problem is that the maps have a black border becuase of anit-ailiasing the black background. I can shrink the UV's to exclude this area, but it's pretty tedious. One of the parameters in the camera properites is 'UV Border' which I think is used to exclude the black border, but I can't find any reference on what the parameter refers to. If I put '5' in there, is it 5 pixels? 5 feet? 5 meters? 5 percent? 1-in-5 chances of working?

Anyone know?