first，l segment the mandible，then split it into two half.
2.l choose the right part，then copy it .l cut the copy short.
3.then both part use spharm-pdm.
4. in the modeltomodeldistance the right mandible as the source，the short copy part as the target，choose corresponding point to point.
5.in shapepopulationviewer ，the attribute：point to point vector，but l found the arrow is not from source to the target，what’s the problem?