So I have a very complex architectural model that I need to hollow out for printing. I have 3ds Max, Netfabb, and Mesh Lab, and I can't figure out a good way to do it. I tried the Filters -> Remeshing > Uniform Mesh Resampling method in Mesh Lab, but that really doesn't help me in my case. Most of the geometry is inside of the model. I would like a way to delete everything that is inside of the mesh so it's just an outer shell, and then just throw a shell modifier on it. Kind of like when you do a union booleon, but that I can apply to a finished model.