# Calculating Wall shear Stress and Mapping value to isosurface skin.

**URL:** https://discourse.vtk.org/t/calculating-wall-shear-stress-and-mapping-value-to-isosurface-skin/2800
**Category:** Support
**Created:** [March 10, 2020, 11:56pm UTC](https://discourse.vtk.org/t/calculating-wall-shear-stress-and-mapping-value-to-isosurface-skin/2800 "2020-03-10T23:56:08Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![LimTzeSuen](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/l/f14d63/32.png) [@LimTzeSuen](https://discourse.vtk.org/u/LimTzeSuen)
#### Post date: [March 10, 2020, 11:56pm UTC](https://discourse.vtk.org/t/calculating-wall-shear-stress-and-mapping-value-to-isosurface-skin/2800/1 "2020-03-10T23:56:08Z")

</div>

Greetings all, I’m new to VTK. I’m trying to calculate Wall Shear Stress on a 3D MRI Velocity Dataset. I’ve done the noise filtering, and generated a 3D velocity volume and the construction of vessel skin by using vtkMarchingCube, but I’m lost now. I have 3 directional velocities for each point, but I don’t know how to apply or what to apply to calculate the wall shear stress.