How to get a vector graphic (like SVG) in dealii?

[Masoud Ahmadi]

Hello everyone,

I save my results as VTK files using write_vtk.
I have been trying to get a vector graphic (like SVG) to display smooth and nice results.
I tried ParaView, but I think they do not support vector graphics in recent versions.
I also tried to write a Python code for this purpose using vtk and matplotlib libraries. It works almost fine, but when I want to plot the mesh too, there are problems.
I used Triangulation from matplotlib.tri, but it only supports triangles mesh, while my mesh type is quadrilaterals.
So, the question is, what is the best way to get SVG image of a VTK file?

Thanks,
Masoud

[Wolfgang Bangerth]

Are you asking how to generate a SVG of the solution, or of a mesh? For the
latter, you can use GridOut. For the former, I do not know whether any of the
usual visualization tools support this, but I doubt that it would be useful:
If you have a lot of cells, *any* scalable representation would have an
enormous number of triangles that would not be fun to work with. Just export
things as a PNG with sufficient resolution.

Best
W.

--
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Marc Fehling]

On Tuesday, December 12, 2023 at 6:39:31 AM UTC-7 masou...@gmail.com wrote:

I also tried to write a Python code for this purpose using vtk and matplotlib libraries. It works almost fine, but when I want to plot the mesh too, there are problems.

A while ago I used matplotlib to create vector graphics out of VTK files. As a reference I used this resource:

https://perso.univ-rennes1.fr/pierre.navaro/read-vtk-with-python.html

 

I used Triangulation from matplotlib.tri, but it only supports triangles mesh, while my mesh type is quadrilaterals.

Workarounds exist for this, see:
https://stackoverflow.com/questions/52202014/how-can-i-plot-2d-fem-results-using-matplotlib

 

Hope this helps!

Marc

[Masoud Ahmadi]

@WB

Thanks for the reply.

I meant the mesh with the results. Yes, GridOut works perfectly for just mesh, but I want to show the solution too.
Yes, I have already tried and can confirm that it is not fun work as you said.

@Marc

Thanks for the links, I will give them a try.
I had seen the second link, but the problem was with the higher-order nodes.

Regards,

Masoud

[Laryssa Abdala]

Hey Masoud, 

You can open vtk and vtu files using Paraview and export them using "Export Scene". You can find more information here: https://www.paraview.org/Wiki/ParaView/Vector_Graphics_Export

I hope this helps, 

Laryssa

[Masoud Ahmadi]

Hi Laryssa,

Thanks for your reply.
Yes, I use Paraview for postprocessing.
However, apparently It does not support the Vector-graphic images in the recent versions.

Bests,

Masoud