# Line perpendicular to an edge of a polyline on a plane in 3D

**URL:** https://discourse.vtk.org/t/line-perpendicular-to-an-edge-of-a-polyline-on-a-plane-in-3d/8581
**Category:** Support
**Created:** [May 24, 2022, 10:37pm UTC](https://discourse.vtk.org/t/line-perpendicular-to-an-edge-of-a-polyline-on-a-plane-in-3d/8581 "2022-05-24T22:37:05Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![adeelz92](https://discourse.vtk.org/user_avatar/discourse.vtk.org/adeelz92/32/4963_2.png) [@adeelz92](https://discourse.vtk.org/u/adeelz92)
#### Post date: [May 24, 2022, 10:37pm UTC](https://discourse.vtk.org/t/line-perpendicular-to-an-edge-of-a-polyline-on-a-plane-in-3d/8581/1 "2022-05-24T22:37:05Z")

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I have a plane (red) in 3D, and I have a curve (white) defined by vtkPolyLine which resides on the plane. The plane source is defined by vtkPlane and final plane data is computed by vtkCutter. I want to find a line (yellow) on the plane that is perpendicular to a particular edge of the curve. What is the fastest way to do this ?

 ![line](https://discourse.vtk.org/uploads/default/original/2X/5/5d51f830b030eb1cfc7089f35b1088fb335e99d7.png)