# model to model distance --\> one distance

**URL:** <https://discourse.slicer.org/t/model-to-model-distance-one-distance/11949>\
**Category:** Support\
**Created:** [June 9, 2020, 1:17pm UTC](https://discourse.slicer.org/t/model-to-model-distance-one-distance/11949 "2020-06-09T13:17:13Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Nick94](https://avatars.discourse-cdn.com/v4/letter/n/b9bd4f/32.png) [@Nick94](https://discourse.slicer.org/u/Nick94)\
**Post date:** [June 9, 2020, 1:17pm UTC](https://discourse.slicer.org/t/model-to-model-distance-one-distance/11949/1 "2020-06-09T13:17:13Z")

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Operating system: Windows 10 Pro  
Slicer version: 4.10.2  
Expected behavior: calculate distance between model in specific region  
Actual behavior: I have a ultrasound volume with Volume S and Volume T segmented. with model to model distance, I can computed the distance and show it in a colormap. However, I want the closest distance between the two margins but only computed at one side. This, because Volume T is at the surface of Volume S, so the clostest margin will be 0. But I want the closest margin to the surface at the other side of Volume S.

Is there a way to select a region of the surface of Volume S, to compute to closest distance?

Thank you very much!