There used to be an open-source tool called 3D Diff, but now it’s part of 3drepo, and no longer freely available. I’ve found some things that are close, but only work for small STL files.
I’m trying to find a way of comparing two 3d meshes, (can be any of the popular formats, DGN, FBX, etc.) to see the differences between the two of them. For example, imagine two different meshes of a house, but the newer mesh contains a new chimney that was not present before. Are there any resources out there for automatically comparing these two meshes and visually displaying the differences?