# OP-planing 25° hip rotation for DPO

**URL:** <https://discourse.slicer.org/t/op-planing-25-hip-rotation-for-dpo/7028>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [June 4, 2019, 7:30pm UTC](https://discourse.slicer.org/t/op-planing-25-hip-rotation-for-dpo/7028 "2019-06-04T19:30:08Z")\
**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:** [June 4, 2019, 7:56pm UTC](https://discourse.slicer.org/t/op-planing-25-hip-rotation-for-dpo/7028/2 "2019-06-04T19:56:37Z")

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When you export a segment then you can choose LPS or RAS coordinate system. Slicer always assumes RAS when reading an STL, OBJ, or PLY file. If you exported in LPS coordinate system then you need to manually [apply a transform that flips the first two axes](https://discourse.slicer.org/t/dicom-and-vtk-file-orientation-issue/717/7).

We’ll soon [add automatic orientation adjustment based on file header](https://issues.slicer.org/view.php?id=4445) but it is still probably a few months away (planned for Slicer5).

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_[View the full topic](https://discourse.slicer.org/t/op-planing-25-hip-rotation-for-dpo/7028)._