# Strain map from deformed point surface

**URL:** https://discourse.paraview.org/t/strain-map-from-deformed-point-surface/13034
**Category:** ParaView Support
**Created:** [October 12, 2023, 9:37pm UTC](https://discourse.paraview.org/t/strain-map-from-deformed-point-surface/13034 "2023-10-12T21:37:30Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Hrotem](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/h/c0e974/32.png) [@Hrotem](https://discourse.paraview.org/u/Hrotem)
#### Post date: [October 12, 2023, 9:37pm UTC](https://discourse.paraview.org/t/strain-map-from-deformed-point-surface/13034/1 "2023-10-12T21:37:30Z")

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hi,  
i have a surface described by points only  
The surface data is in two conditions - relaxed and stretched  
i would like to get the strain / stretch map pf the stretched condition. what is the way to do it?  
Thanks,  
Rotem

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### Author: ![FEngineer](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/f/5f8ce5/32.png) [@FEngineer](https://discourse.paraview.org/u/FEngineer)
#### Post date: [October 12, 2023, 10:41pm UTC](https://discourse.paraview.org/t/strain-map-from-deformed-point-surface/13034/2 "2023-10-12T22:41:41Z")

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I know that GOM Correlate can do it for 3D scans using digital image correlation. In ParaView, you would have to calculate it “manually” using the definition of strain:

ε\_x=∂u\_x/∂x

where u is displacement.