When I have a plaster cast of a mandibula and rest it upside down on a table, in most cases it will be in a stable position.
In real life, I do not have a plaster cast, but a 3D scan, i.e. a surface mesh. I want to transform the meshes to the position they would be in if they were resting on a table.
Why: we have 3D scans of mandibulae, but some of them are slightly misaligned against the axis because the patient did not sit straight. For easier comparison, we would like to make them look more similar. And in case someone suggests "registration": we do that anyway.
Can someone point me to an algorithm? Any keyword I can use to google?