# Regarding active scalars

**URL:** https://discourse.slicer.org/t/regarding-active-scalars/29244
**Category:** VMTK
**Created:** [May 2, 2023, 1:23pm UTC](https://discourse.slicer.org/t/regarding-active-scalars/29244 "2023-05-02T13:23:24Z")
**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: [May 10, 2023, 4:36am UTC](https://discourse.slicer.org/t/regarding-active-scalars/29244/2 "2023-05-10T04:36:40Z")

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See information in this discussion:

> [@Curvature, torsion, tortuosity computation algorithms in VMTK](https://discourse.slicer.org/t/curvature-torsion-tortuosity-computation-algorithms-in-vmtk/29186):
>
> Hello! I am trying to calculate the geometric indices such as curvature, torsion and tortuosity from the extracted centrelines in 3D slicer by using VMTK extension. Can anyone please tell me what are the mathematical definitions used over here for calculations? Thanks!

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