# Mandible spharm pdm

**URL:** <https://discourse.slicer.org/t/mandible-spharm-pdm/22273>\
**Category:** Support\
**Tags:** spharm-pdm\
**Created:** [March 3, 2022, 2:28am UTC](https://discourse.slicer.org/t/mandible-spharm-pdm/22273 "2022-03-03T02:28:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![lili-yu22](https://avatars.discourse-cdn.com/v4/letter/l/dbc845/32.png) [@lili-yu22](https://discourse.slicer.org/u/lili-yu22)\
**Post date:** [March 3, 2022, 2:28am UTC](https://discourse.slicer.org/t/mandible-spharm-pdm/22273/1 "2022-03-03T02:28:24Z")

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Dear expert  
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?

 ![IMG_20220303_102652](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/1/c/1ca8e6d1a7f5bd60f69db4660c295f5faffea1c9.jpeg)