# Merge CT volume node with a model node in python

**URL:** <https://discourse.slicer.org/t/merge-ct-volume-node-with-a-model-node-in-python/9457>\
**Category:** Development\
**Created:** [December 10, 2019, 4:17am UTC](https://discourse.slicer.org/t/merge-ct-volume-node-with-a-model-node-in-python/9457 "2019-12-10T04:17:08Z")\
**Posts on this page:** 1\
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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [December 10, 2019, 2:12pm UTC](https://discourse.slicer.org/t/merge-ct-volume-node-with-a-model-node-in-python/9457/2 "2019-12-10T14:12:38Z")

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Yes, you can load PLY/STL models and display them with the CT. But because those formats don’t define a reference space they may not align. See [this post](https://discourse.slicer.org/t/incorrect-overlay-of-vti-and-stl-from-the-same-dicom-series/6828/4) for example.

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