gmsh generator changed in 0.18.4 stable ?

[qwerkus]

Hello,

I upgraded my computer (ryzen!!!) and moved from ubuntu 18.04 to 20.04. Installation of freecad 0.18.4 stable via ppa went without issue, and most things seem to work. Only thing I can't manage to get working is mesh generation with gmsh. I always end up with the same low resolution mesh and some python errors using the same models that used to work flawlessly under ubuntu 18.04.

Working gmsh in ubuntu 18.04 / freecad 0.18.4

1.jpg (446.03 KiB) Viewed 1069 times

Current error / gmsh result:

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Any chance to get this working ?

Thanks for your time.

[Jee-Bee]

can you check which gmsh you have command line gmsh -version that helps a lot i think

[qwerkus]

can you check which gmsh you have command line gmsh -version that helps a lot i think

4.4.1. Don't think there has been a new one for quite some time now.

[bernd]

Have you tried to set maximum element size in gmsh mesh object?

[qwerkus]

Have you tried to set maximum element size in gmsh mesh object?

Yes, doesn't seem to work, no matter if I set it to 1mm or 0.0001: always the same result, plus some weird python errors.

[sgrogan]

Yes, doesn't seem to work, no matter if I set it to 1mm or 0.0001: always the same result, plus some weird python errors.

Can you post the geometry? You can delete the mesh and results. I will test on Win. It looks like some default has changed from 0.18.4 to 0.19_pre.
On Linux you must be using the same gmsh executable.

[qwerkus]

Yes, doesn't seem to work, no matter if I set it to 1mm or 0.0001: always the same result, plus some weird python errors.

Can you post the geometry? You can delete the mesh and results. I will test on Win. It looks like some default has changed from 0.18.4 to 0.19_pre.
On Linux you must be using the same gmsh executable.

Doesn't matter which geometry. I tried to mesh a simple bar, and get the same result: low res mesh + python errors. What I don't get is why it worked in ubuntu 18.04 with the same freecadversion and now it doesn't. Is some python library broken ? How can I find out which one ?

[bernd]

Very strange ...

What happens in background ...

- FreeCAD writes the geometry to brep
- FreeCAD writes a geo file for gmsh
- FreeCAD runs gmsh binary with this geo file
- Gmsh mesh the geometry from the brep with the parameter in the geo file and writes a unv file
- FreeCAD reads the unv file and save the mesh inside the gmsh mesh object

The problem could be on various areas. What I would do.

- The location of the geo is printed in report konsole
- Inside the geo is a command to run gmsh
- First check if the max element length was written correct in the geo file
- run gmsh with this geo file and the brep
- import manually the unv into FreeCAD

After this you should know much more where the problem could be.

bernd

[qwerkus]

- The location of the geo is printed in report konsole
- Inside the geo is a command to run gmsh
- First check if the max element length was written correct in the geo file
- run gmsh with this geo file and the brep
- import manually the unv into FreeCAD

After this you should know much more where the problem could be.

bernd

Good plan - thanks a lot for the explanations Bernd; do you mean the python console ? Because my report view doesn't show any geo location.

Did a few experiments, and found out that when running freecad with sudo, gmesh doesn't do anything! It shows no errors, but also no mesh!

Also, I tried freecad-daily, and there it seems to work! Not sure its a good idea to run a dev version of the app, as I'm still a total noob with this software, and definitely not a good python programmer.

Overall I'm not impressed by the calculix on ryzen 7 performance - somehow only marginally faster than my old i5 3570k. Anything I can do to improve this?