Errors while creating mesh with Gmsh

[Davide_sd]

Just downloaded Freecad 0.19-24267 appimage. I'm getting the following errors while generating the mesh with Gmsh.

Explanation:
1. I select the part in the viewport.
2. Click the button "Create a FEM mesh from a shape by Gmsh mesher" (I do have Gmsh installed).
3. Click apply. This message appears in the window:

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0.0: We are going to start ...
0.0: Start Gmsh ...

Unfortunaly, the meshing process never ends. Then I click cancel with no mesh created.

Here is the report:

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19:18:17  Active analysis found: Analysis
19:18:17    ElementDimension: 3
19:18:17    Group meshing for analysis is set to true in FEM General Preferences. Are you really sure about this? You could run into trouble!
19:18:17    Empty reference: MaterialSolid
19:18:17    One material with no reference shapes. No need to make a group for materials.
19:18:17    {'ConstraintFixed': ['Face1'], 'ConstraintForce': ['Face2']}
19:18:17    /tmp/fcfem_rujnmida/Box_Geometry.brep
19:18:17    /tmp/fcfem_rujnmida/Box_Mesh.unv
19:18:17    /tmp/fcfem_rujnmida/shape2mesh.geo
19:18:17    /usr/local/bin/gmsh
19:18:17  Unexpected error when creating mesh: <class 'RuntimeError'>
19:18:17  Traceback (most recent call last):
  File "/tmp/.mount_FreeCAZvgZl3/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 117, in clicked
    self.run_gmsh()
  File "/tmp/.mount_FreeCAZvgZl3/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 210, in run_gmsh
    error = sys.exc_info()[0].strip()
<class 'AttributeError'>: type object 'RuntimeError' has no attribute 'strip'
19:18:17  timer2
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19:18:25  Traceback (most recent call last):
19:18:25    File "/tmp/.mount_FreeCAZvgZl3/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 151, in update_timer_text
19:18:25      self.form.l_time.setText("Time: {0:4.1f}: ".format(time.time() - self.Start))
19:18:25  AttributeError: 'NoneType' object has no attribute 'l_time'
19:18:25  timer2
19:18:25  Traceback (most recent call last):
19:18:25    File "/tmp/.mount_FreeCAZvgZl3/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 151, in update_timer_text
19:18:25      self.form.l_time.setText("Time: {0:4.1f}: ".format(time.time() - self.Start))
19:18:25  AttributeError: 'NoneType' object has no attribute 'l_time'
19:18:25  timer2

No errors if I create the mesh with Netgen.

[bernd]

Is gmsh installed and does the gui of gmsh works for you? Ahh just realized you did not mention on which operating system do you are? On Linux you need to install gmsh yourself, on windows it is included in FreeCAD.

[Davide_sd]

Sorry about that. Here are the information:

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OS: Ubuntu 20.04.2 LTS (KDE/plasma)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24267 (Git) AppImage
Build type: Release
Branch: master
Hash: b2ca86d8d72b636011a73394bf9bcdedb3b109b7
Python version: 3.8.6
Qt version: 5.12.5
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United States (en_US)

Gmsh (version 4.8.0) is installed in my system; I compiled it from source. I can launch it from anywhere in the terminal as well as with a desktop launcher. Gmsh is working fine both with script and with GUI.

[UR_]

...I compiled it from source. I can launch it from anywhere...

So your system knows about location of gmsh, but FreeCAD works with

Here is the report:
19:18:17 /usr/local/bin/gmsh

Better to use Edit->Preferences->FEM to setup your executable's location.

Screenshot 001.png (20.32 KiB) Viewed 3157 times

[Davide_sd]

Better to use Edit->Preferences->FEM to setup your executable's location.

There is no FEM in my Preferences!

[Davide_sd]

There is no FEM in my Preferences!

Ok, found it, I had to activate the workbench in Preferences -> Workbenches. I specified the installation path but it doesn't solve the problem.

A little note: I also installed FreeCAD 0.18.4 with apt from the repository, which is perfectly able to use gmsh out of the box. Unfortunately this version throw errors about Python's time.clock, that's why I'm trying v0.19...

[UR_]

Can you please provide an updated copy of your report view.


Remark: strip() error was fixed at version 0.19.24385

[Davide_sd]

Can you please provide an updated copy of your report view.


Remark: split() error was fixed at version 0.19.24385

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11:49:11  ('Mod/Pyramids_and_polyhedrons', 'Mod/Pyramids-and-Polyhedrons', 'Mod/FreeCAD-Pyramids-and-Polyhedrons', 'Mod/Pyramids-and-polyhedrons')
11:49:50  Active analysis found: Analysis
11:54:40  Active analysis found: Analysis
11:54:44  Active analysis found: Analysis
11:54:44    ElementDimension: 3
11:54:44    Group meshing for analysis is set to true in FEM General Preferences. Are you really sure about this? You could run into trouble!
11:54:44    /tmp/fcfem_40b2x50x/Box_Geometry.brep
11:54:44    /tmp/fcfem_40b2x50x/Box_Mesh.unv
11:54:44    /tmp/fcfem_40b2x50x/shape2mesh.geo
11:54:44    /usr/local/bin/gmsh
11:54:44  Unexpected error when creating mesh: <class 'RuntimeError'>
11:54:44  Traceback (most recent call last):
  File "/tmp/.mount_FreeCAFjVwO4/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 117, in clicked
    self.run_gmsh()
  File "/tmp/.mount_FreeCAFjVwO4/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 210, in run_gmsh
    error = sys.exc_info()[0].strip()
<class 'AttributeError'>: type object 'RuntimeError' has no attribute 'strip'
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11:54:50  Traceback (most recent call last):
11:54:50    File "/tmp/.mount_FreeCAFjVwO4/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 151, in update_timer_text
11:54:50      self.form.l_time.setText("Time: {0:4.1f}: ".format(time.time() - self.Start))
11:54:50  AttributeError: 'NoneType' object has no attribute 'l_time'
11:54:50  timer2
11:54:50  Traceback (most recent call last):
11:54:50    File "/tmp/.mount_FreeCAFjVwO4/usr/Mod/Fem/femtaskpanels/task_mesh_gmsh.py", line 151, in update_timer_text
11:54:50      self.form.l_time.setText("Time: {0:4.1f}: ".format(time.time() - self.Start))
11:54:50  AttributeError: 'NoneType' object has no attribute 'l_time'
11:54:50  timer2

Is there an AppImage for 0.19.24385?

[UR_]

Is there an AppImage for 0.19.24385?

Latest at github is 24267, ATM
Perhaps a more recent one will be available on wednesday.

[UR_]

I compiled it from source

Using precompiled version from http://gmsh.info/bin/Linux/gmsh-4.8.0-Linux64.tgz is perhaps worth a try.