gmsh fails on simple cube

[wingman]

Thanks for your help !

I thought VTK was compiled into FreeCAD as a library. I didn't realize that it was installed on my OS. I reported this problem on the VTK discord channel. I'll see what they say. In the mean time, I'll roll back to VTK-7 and rerun it.

[user1234]

This is maybe a smsh issue. On newer smsh versions the file SMDS_VtkEdge.cpp with the error does not exsist anymore.

Greetings
user1234

[wingman]

https://discourse.vtk.org/t/vtk-9-0-3-1 ... eecad/6749

[wingman]

This is maybe a smsh issue. On newer smsh versions the file SMDS_VtkEdge.cpp with the error does not exsist anymore.

Any ideas on how to test this ? I'd love to just run vtk-8, but it isn't available for Fedora 34 and the build is non trivial due to dependencies.

[wingman]

The cube can be meshed with FreeCAD 0.19-2 run via appimage.

OS: Fedora 34 (Workstation Edition) (KDE/plasmax11)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 0.19.2)
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.8
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.4.0
Locale: English/United States (en_US)

[user1234]

Pretty sure, that is packed with an other VTK.

https://discourse.vtk.org/t/vtk-9-0-3-1 ... eecad/6749

Just said, that libraries and their API can change over the time. That must not be a bug.

Greetings
user1234

[host kakamay]

It works with vtk7 but wont with vtk9.
See also here: https://forum.freecadweb.org/viewtopic. ... 37#p514907

Greetings
user1234

I downgraded my vtk to 8.2 version and while runing FEM workbench will result in crash
error message:
19:36:23 /usr/lib/freecad/lib/libSMDS.so: undefined symbol: _ZN12vtkCellLinks8DeepCopyEP20vtkAbstractCellLinks
19:36:23 Traceback (most recent call last):
File "<string>", line 72, in Initialize
File "/usr/lib/python3.9/site-packages/shiboken2/files.dir/shibokensupport/__feature__.py", line 142, in _import
return original_import(name, *args, **kwargs)

[torger]

I have the same issue now when I've built freecad from head on Debian Linux, VTK version I have is 9.1.0. That is I get the following when I run gmsh a simple cube:

2022-02-14 17:00:45.694 ( 8.041s) [ 93D9D4C0] vtkCellArray.cxx:551 ERR| vtkCellArray (0x5641ff576cf0): Invalid location.
FreeCAD: /freecad-source/src/3rdParty/salomesmesh/src/SMDS/SMDS_VtkEdge.cpp:119: virtual int SMDS_VtkEdge::NbNodes() const: Assertion `nbPoints >= 2' failed.

The 0.20 weekly build appimage which uses VTK 9.0.1 works though.

If anyone has a lead to what causes this error and how to fix it when building from source I would be grateful to hear about it.

[torger]

I tried reverting to 9.0.1, same issue, then 7.1.1 - the issue gone. However there are builds that work both with 9.1.0 and 9.0.1 so reverting to VTK 7 shouldn't be necessary. I'm guessing there is some sort of version incompatibility of the dependencies, I'm suspecting than PyQT is involved but I'm not sure. Well, I'll roll with VTK 7 for a while and see how that goes.

I have the same issue now when I've built freecad from head on Debian Linux, VTK version I have is 9.1.0. That is I get the following when I run gmsh a simple cube:

[wmayer]

https://forum.freecadweb.org/viewtopic. ... 28#p583828