# 3D model annotation at original resolution
**URL:** https://discourse.slicer.org/t/3d-model-annotation-at-original-resolution/23264
**Category:** Support
**Created:** [May 3, 2022, 3:23pm UTC](https://discourse.slicer.org/t/3d-model-annotation-at-original-resolution/23264 "2022-05-03T15:23:21Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@NicolasRannou](https://discourse.slicer.org/u/NicolasRannou)
#### Post date: [May 3, 2022, 3:23pm UTC](https://discourse.slicer.org/t/3d-model-annotation-at-original-resolution/23264/1 "2022-05-03T15:23:21Z")
Hi, is it possible to annotate the vertices of a 3D model and keep the original vertex information?
I have a big 3d file (STL) of the mouth. I must classify each vertex of the model as Tooth, Jaw, or Preparation. Is there a way to do so without losing the original vertex information? All I can find at the moment requires data to be converted to a label map, hence losing the original information.
Alternatively, is it possible to “split” the mesh into separate smaller 3d models?
The workaround I can currently think of is to generate a high-res segmentation label map and then match the vertices from the original model to the closest one in the segmentation’s models.
Thanks!
Nicolas
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### Author:  [@pieper](https://discourse.slicer.org/u/pieper)
#### Post date: [May 3, 2022, 7:10pm UTC](https://discourse.slicer.org/t/3d-model-annotation-at-original-resolution/23264/2 "2022-05-03T19:10:14Z")
Hi @NicolasRannou 👋
Did you try [ProbeVolumeWithModel](https://slicer.readthedocs.io/en/latest/user_guide/modules/probevolumewithmodel.html?highlight=Probe%20Volume%20With%20Model)?
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### Author:  [@NicolasRannou](https://discourse.slicer.org/u/NicolasRannou)
#### Post date: [May 9, 2022, 7:03am UTC](https://discourse.slicer.org/t/3d-model-annotation-at-original-resolution/23264/3 "2022-05-09T07:03:45Z")
Hi @pieper, thanks for the suggestion.
I didn’t try and I’ll give it a shot, it seems promising!
Thanks!