# Saved surface model is not aligned with volume when viewed in external software

**URL:** <https://discourse.slicer.org/t/saved-surface-model-is-not-aligned-with-volume-when-viewed-in-external-software/821>\
**Category:** Support\
**Created:** [August 4, 2017, 1:09pm UTC](https://discourse.slicer.org/t/saved-surface-model-is-not-aligned-with-volume-when-viewed-in-external-software/821 "2017-08-04T13:09:08Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [August 4, 2017, 1:11pm UTC](https://discourse.slicer.org/t/saved-surface-model-is-not-aligned-with-volume-when-viewed-in-external-software/821/2 "2017-08-04T13:11:03Z")

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Most common issue is LPS/RAS coordinate system mismatch. See this post about how this inconsistency can be fixed:

> [@DICOM and VTK file orientation Issue](https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717/7):
>
> Most common issue is LPS/RAS coordinate system mismatch. So, may try to convert your data from LPS to RAS coordinate system by transforming it using Transforms module by a matrix that has [-1,-1,1,1] in the diagonal: [image]

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_[View the full topic](https://discourse.slicer.org/t/saved-surface-model-is-not-aligned-with-volume-when-viewed-in-external-software/821)._