# Deleting vertices based on normal vector

**URL:** https://discourse.vtk.org/t/deleting-vertices-based-on-normal-vector/4362
**Category:** Support
**Created:** [October 6, 2020, 3:24pm UTC](https://discourse.vtk.org/t/deleting-vertices-based-on-normal-vector/4362 "2020-10-06T15:24:46Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![lassoan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/lassoan/32/50_2.png) [@lassoan](https://discourse.vtk.org/u/lassoan)
#### Post date: [October 6, 2020, 4:51pm UTC](https://discourse.vtk.org/t/deleting-vertices-based-on-normal-vector/4362/4 "2020-10-06T16:51:33Z")

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You can find continuous edge by computing curvature for each point and connecting them using vtkDijkstraGraphGeodesicPath, as suggested before:

> [@Get surface area of region on polydata](https://discourse.vtk.org/t/get-surface-area-of-region-on-polydata/3738):
>
> I would like to derive the surface area of a specific region on the surface of polydata. This specific region would be the part of the surface that is visible when viewed from above (in the y-plane) such that overlapping “points” are not considered. This is the isosurface generated by Marching Cubes: To illustrate, I have derive this particular top-surface by manipulating the original image stack and use MC to reconstruct the isosurface of the manipulated images (in green):

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