# Ellalign.vtk and SPHARM.vtk

**URL:** <https://discourse.slicer.org/t/ellalign-vtk-and-spharm-vtk/19637>\
**Category:** Support\
**Created:** [September 13, 2021, 2:42am UTC](https://discourse.slicer.org/t/ellalign-vtk-and-spharm-vtk/19637 "2021-09-13T02:42:55Z")\
**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:** [September 13, 2021, 2:42am UTC](https://discourse.slicer.org/t/ellalign-vtk-and-spharm-vtk/19637/1 "2021-09-13T02:42:55Z")

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after using SPHARM，I want use MODEL TO MODEL DISTANCE，but i am wondering which file I should use，the spharm ellalign.vtk or SPHARM. vtk? what’s the difference?  
thanks to help me