# Comparison of 3D slicer to geomagic software for volume change

**URL:** <https://discourse.slicer.org/t/comparison-of-3d-slicer-to-geomagic-software-for-volume-change/31332>\
**Category:** Support\
**Created:** [August 24, 2023, 10:39am UTC](https://discourse.slicer.org/t/comparison-of-3d-slicer-to-geomagic-software-for-volume-change/31332 "2023-08-24T10:39:44Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![aljarkow](https://avatars.discourse-cdn.com/v4/letter/a/58f4c7/32.png) [@aljarkow](https://discourse.slicer.org/u/aljarkow)\
**Post date:** [August 24, 2023, 10:39am UTC](https://discourse.slicer.org/t/comparison-of-3d-slicer-to-geomagic-software-for-volume-change/31332/1 "2023-08-24T10:39:44Z")

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Hello all,  
Does anyone have insight into whether 3D slicer is as accurate as Geomagic software for calculating small changes in volume between 2 STL files (at the micron level)?  
I have not been able to find sources comparing the spacial resolution accuracy and voxel sizes for my research purposes.  
Thanks in advance!

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/83011_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [August 24, 2023, 4:08pm UTC](https://discourse.slicer.org/t/comparison-of-3d-slicer-to-geomagic-software-for-volume-change/31332/2 "2023-08-24T16:08:00Z")

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It should be comparable, because it is really the 3D model is providing the geometry. I am not sure how you are calculating **small changes in volume** in geomagic. Are you subtracting one from the other?

If so, ideally you should get same answer in both software (within precision limits). But that’s a fairly simple test for you to do. If you describe what you want to do, we can probably tell you how to do that in Slicer.

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**Author:** ![aljarkow](https://avatars.discourse-cdn.com/v4/letter/a/58f4c7/32.png) [@aljarkow](https://discourse.slicer.org/u/aljarkow)\
**Post date:** [August 24, 2023, 7:40pm UTC](https://discourse.slicer.org/t/comparison-of-3d-slicer-to-geomagic-software-for-volume-change/31332/3 "2023-08-24T19:40:55Z")

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Hi, thanks for the reply. I am calculating changes in volume on Invisalign attachments, which are already very small to begin with (1-4mm height or width, some even 1mm) so changes would be very small. I am not sure which software would be easier to use and accurate for this purpose between the 2 I have available