# How to convert model to markups?

**URL:** <https://discourse.slicer.org/t/how-to-convert-model-to-markups/3665>\
**Category:** Development\
**Created:** [August 5, 2018, 3:55pm UTC](https://discourse.slicer.org/t/how-to-convert-model-to-markups/3665 "2018-08-05T15:55:42Z")\
**Posts on this page:** 1\
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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 6, 2018, 9:12am UTC](https://discourse.slicer.org/t/how-to-convert-model-to-markups/3665/6 "2018-08-06T09:12:32Z")

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A single approximate entry point should be enough to initialize an automatic trajectory finding algorithm. You can get approximate direction from the image’s standard anatomical orientation.

By specifying two points, you can specify the trajectory completely, which you can use as is, or as an initial guess. A Slicer extension is already available for this:

More information: [How to install pedicle screws simulator extension?](https://discourse.slicer.org/t/how-to-install-pedicle-screws-simulator-extension/1073/8)

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