Asking for delaunay 2D

ParaView Support
1

Dear all,

I’m the beginner of Paraview, so I’m quite sorry for in advance.

My question is I save the data file to ‘csv’ foramt

So, I follow other people’s advice

import CSV file → apply filter(tables to point) → apply filter(Delauay 2D)

so, I would like to see my result with pressure.

However, the problem is when I apply Delaunay 2D I get another strange body parts

image
image1018×1129 61.3 KB

so this is what I want

However, if I apply Delaunay 2D filter, I get this result.

Does anyone know how to fix this problem?

I need your help.

Please help me

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image907×1115 41.8 KB

2

This is the expected behavior with a concave point cloud.

3

Thank you fore your reply…

I’m sorry but how do I get exact solution?? I would like to export the figures…

4

There is no automatic solution, you could manually select the cells you do not want, invert the selection and extract the resulting geometry.

5

oh…Thank you so much… really helpful to me… . so for spherical model is not good BTW, if I save the data writtn as vtk format, there are no problems such as this problems??

6

I’m sorry once agian. I need your help… I save my data to VTK file…
and I don’t know what is this… so

image
image672×634 16.7 KB

So, I use Delaunay 2D once agian…

So, can you tell me how to to select the cells or data from paraview?

and do you know when I import vtk files, why I get this ??

IF I choose ‘point’ I sucessfully see the data… but before selecting point data,

I cannot clearly see my result…

If I do not need to apply delauanay 2D filter, I would like to use another method.

It’s quite complex to eliminate some sells from the paraview
Do you know how to solve this problem?

7

At first glance, your points data looks like a structured grid points. So instead of the Table To Points filter, the Table To Sturctured Grid filter may be more suitable for you.

1 Like
8

Thank you for your reply.

Actually, I followed your opinion and apply Table to structured grid filter…

However, result is same as befreo…

How do to it…?

9

Would it be possible to share your data?

10

I can share my data. I attached my grid data.

Please check it.
grid.csv (1.6 MB)

11

I was able to import the data into ParaView in the following way.

  1. Add a column of z-coordinates to the csv file and load it into ParaView.
  2. Next, in the Table To Structured Grid filter, set the settings as shown below and Apply.

tableToStructuredGrid
tableToStructuredGrid904×719 295 KB

12

Thank you very much. I understand it. I think I made some mistakes.

Then I would like to know, if I save the data to vtk files, I cannot apply filter Table to structred grid… so do you mean, should I have to save the data to csv format in order to solve the problem with delaunay 2D?

This is the fortran code for vtk file format.

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image1920×1144 119 KB

13

Hello,

As a workaround for the problem of Delaunay 2D, I think it is better to treat the data as Structured Grid Data instead of constructing it from point clouds using Delaunay 2D. So, as a way to handle the data as Structured Grid Data, you can choose to output the data in VTK format or CSV + Table To Structured Grid, whichever is easier to use.