# \#vertex\_shader

**URL:** https://discourse.vtk.org/tag/vertex-shader/46.md

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## [How to determine/account for vertex coordinates that are normalized before being passed to the vertex shader?](https://discourse.vtk.org/t/how-to-determine-account-for-vertex-coordinates-that-are-normalized-before-being-passed-to-the-vertex-shader/16061)

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**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 1\
**Last updated:** [September 24, 2025, 9:21pm UTC](https://discourse.vtk.org/t/how-to-determine-account-for-vertex-coordinates-that-are-normalized-before-being-passed-to-the-vertex-shader/16061 "2025-09-24T21:21:38Z")

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Hello!!! I’m using VTK 9.5.0 and trying to modify the position of points in the glsl vertex shader. I’ve noticed that in some cases (not all), the vertex locations passed to the vertex shader by VTK are scaled/shifted …