# Wondering if I can create segmentation label from imported STL object?

**URL:** <https://discourse.slicer.org/t/wondering-if-i-can-create-segmentation-label-from-imported-stl-object/8201>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [August 27, 2019, 8:57pm UTC](https://discourse.slicer.org/t/wondering-if-i-can-create-segmentation-label-from-imported-stl-object/8201 "2019-08-27T20:57:52Z")\
**Posts on this page:** 1\
**Showing post:** 4

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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 28, 2019, 5:39pm UTC](https://discourse.slicer.org/t/wondering-if-i-can-create-segmentation-label-from-imported-stl-object/8201/4 "2019-08-28T17:39:06Z")

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Probably the STL file is defined in LPS coordinate system. Slicer assumes it is in RAS. Try transforming the model from LPS to RAS coordinate system by applying a transform as described here:

> [@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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