Maybe it's a matter of version of gmsh but here's what it's happening.
OS: Linux Mint 18.3 Sylvia
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.18.13524 (Git)
Build type: None
Branch: master
Hash: 04a7f566fe71dcad8fda92af2f467d3cc211a372
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.2.0
Locale: Italian/Italy (it_IT)
First try.
Just for sample I create a cube with Part and then try to apply a simple mesh.
I installed gmsh from the repository of the linux distribution, which I know it's not updated (2.10.1) but that's the first thing to do. So I select the cube, run the command "FEM mesh from shape by Gmsh", click on Apply and then the program sticks! Also after I xkilled the graphic window of FreeCAD, gmsh continue to run in backgroud, spinning the fan of my laptop at 10000 rpm to cool it down: I have to kill separately also the process of gmsh from the terminal.
Below is the log, where I commented the point when the program starts to loop.
gmsh2.10.1fails.log- (13.93 KiB) Downloaded 105 times
I purge the previous version of gmsh and, since it's not updated in the repository, I downloaded .deb package of version 2.15.0. Checked all the dependencies and installed. Did the same mesh sample as before and got in the console the following snappy message.
We are going to start Gmsh FEM mesh run!Msg:
Msg: Part to mesh: Name --> Box, Label --> Cubo, ShapeType --> SolidMsg:
Msg: CharacteristicLengthMax: 1e+22Msg:
Msg: CharacteristicLengthMin: 0.0Msg:
Msg: ElementOrder: 2Msg:
Msg: ElementDimension: 3Msg:
Msg: /tmp/Box_Geometry.brepMsg:
Msg: /tmp/Box_Mesh_TmpGmsh.unvMsg:
Msg: /tmp/shape2mesh.geoMsg:
Msg: /usr/bin/gmshMsg:
Msg: No Group meshing for analysis.Msg:
Msg: ('Unexpected error when creating mesh: ', <type 'exceptions.RuntimeError'>)Msg:
- gmsh2.15.0fails.log
- (13.33 KiB) Downloaded 84 times
I purge also the version 2.15.0 of gmsh from the system and finally try to compile it by my own. I downladed from gitlab the 144 MB of the repository of gmsh version 3.0.7. I've been warned to include the support for OpenCASCADE while compiling and I checked that the flag ENABLE_OCC is ON by default so I run cmake->make->sudo make install and wait a long time after which I have the latest compiled gmsh file in ../bin folder.
Try to generate the mesh on the cube and... alas!
We are going to start Gmsh FEM mesh run!Msg:
Msg: Part to mesh: Name --> Box, Label --> Cubo, ShapeType --> SolidMsg:
Msg: CharacteristicLengthMax: 1e+22Msg:
Msg: CharacteristicLengthMin: 0.0Msg:
Msg: ElementOrder: 2Msg:
Msg: ElementDimension: 3Msg:
Msg: /tmp/Box_Geometry.brepMsg:
Msg: /tmp/Box_Mesh_TmpGmsh.unvMsg:
Msg: /tmp/shape2mesh.geoMsg:
Msg: /home/rtreu74/Documenti/gmsh/tempGMSH3.0.7Msg:
Msg: No Group meshing for analysis.Msg:
Msg: ('Unexpected error when creating mesh: ', <type 'exceptions.AttributeError'>)Msg:
- gmsh3.0.7fails.log
- (13.73 KiB) Downloaded 90 times
So, does anyone know the secret vodoo dance necessary to install gmsh in order to make it work with FreeCAD?
I'll be forever in debt if can give a clear word about the right steps to do.
After that, I wonder why Netgen option has been eliminated from the GUI. As I could understand from other posts, several users were familiar with Netgen mesh generator and found similar problems in using gmsh.
I can understand gmsh may offer more choices (1D and 2D) but maybe the Netgen option can be still provided in the daily-builds and also in the stable release for those who prefer that, without the need to compile each time a customized version of FC.
