defining a mesh. This is better practice than using arbitrary MathTransform objects as it is well defined and allows for serialization of the mesh to occur. Former-commit-id: 7e4abe637edacca71e1e1c98d99521cd33415fb0
Former-commit-id: 2a9569942c48542cf708b6c0b9189146fd954c11
Former-commit-id: 64fa9254b946eae7e61bbc3f513b7c3696c4f54f