# Delaunay 2D connecting wrong points

**URL:** https://discourse.paraview.org/t/delaunay-2d-connecting-wrong-points/7885
**Category:** ParaView Support
**Created:** [August 29, 2021, 4:22pm UTC](https://discourse.paraview.org/t/delaunay-2d-connecting-wrong-points/7885 "2021-08-29T16:22:27Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Diogo\_Cecilio](https://discourse.paraview.org/user_avatar/discourse.paraview.org/diogo_cecilio/32/7368_2.png) [@Diogo\_Cecilio](https://discourse.paraview.org/u/Diogo_Cecilio)
#### Post date: [August 29, 2021, 4:22pm UTC](https://discourse.paraview.org/t/delaunay-2d-connecting-wrong-points/7885/1 "2021-08-29T16:22:27Z")

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Hello,  
I’m trying to coloring of a flat surface from a data in a four columns (x, y, z, scalar) .csv format ([Dropbox - sqrtJ2SRM-Determ.csv - Simplify your life](https://www.dropbox.com/s/qi4tnffvv5gvo2z/sqrtJ2SRM-Determ.csv?dl=0)). I open the .csv file and use the filters “Table To Points” and “Delaunay 2D”, and this is what I get:

 ![image](https://discourse.paraview.org/uploads/default/original/2X/0/07e02a1ee335665ada2ddf8c18a83ca73d73a461.jpeg)

But the geometry I get is wrong, the is some lines connecting in wrong places near the slope toe.

See the point data:

 ![image](https://discourse.paraview.org/uploads/default/original/2X/8/8107e5e81e18f1fa38a47487dc3538bc3f783cc3.png)

How to fix this?

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### Author: ![Kenichiro-Yoshimi](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/k/ecc23a/32.png) [@Kenichiro-Yoshimi](https://discourse.paraview.org/u/Kenichiro-Yoshimi)
#### Post date: [September 1, 2021, 2:18am UTC](https://discourse.paraview.org/t/delaunay-2d-connecting-wrong-points/7885/2 "2021-09-01T02:18:32Z")

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Hello,

Increasing the value of **Alpha** in the **Delaunay2D** filter will improve it.

 ![delaunay_alpha](https://discourse.paraview.org/uploads/default/original/2X/a/a1c3d2297a5cc374c08d93405ac0c57be1bef61b.jpeg)

If the incorrect parts still remain, you may need to select them manually, then check **Invert Selection** in the **Find Data** tool to make sure only the correct parts are selected, and use the **Extract Selection** filter.