Error in any shape from gmsh

[polemidis]

Hello, I have used the FEM successfully in the past but now I cannot even get a simple mesh not even from a cube.
OS: Ubuntu 18.10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15403 (Git)
Build type: Release
Branch: master
Hash: 44e8f9e9bf3b7a93e927c97b19c6d2850fd75f19
Python version: 2.7.15+
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

This is what I am getting in console as soon as I press "apply" on the "Create FEM mesh from shape by Gmsh mesher" tool

Code: Select all

We are going to start Gmsh FEM mesh run!
  Part to mesh: Name --> Box,  Label --> Cube, ShapeType --> Solid
  CharacteristicLengthMax: 1e+22
  CharacteristicLengthMin: 0.0
  ElementOrder: 2
  ElementDimension: 3
  /tmp/Box_Geometry.brep
  /tmp/Box_Mesh_TmpGmsh.unv
  /tmp/shape2mesh.geo
  /usr/bin/gmsh
  Group meshing for analysis.
  The Part should have a pretty new FEM mesh!
Error   : Gmsh requires OpenCASCADE to import shape

Any leads are welcomed!
Thank you!

[bernd]

your gmsh is not compiled with OpenCascade. Best is to use this gmsh: https://forum.freecadweb.org/viewtopic.php?f=18&t=31360

Code: Select all

Error   : Gmsh requires OpenCASCADE to import shape

BTW: use code tags for FreeCAD report output. I changed your post in this regard.

[polemidis]

I didn;t understand a bit from that post, and I figured its kind of a mess to install a package from 18.04 to 18.10.
So I went online, downloaded the gmsh binary v4.xx and replaced the old gmsh in /usr/bin . Most likely I have caused a lot of mess, but hey, it looks like it works.
It throws a error "Unknown element type for UNV export (MSH type 15) - output file might be invalid" but I can see the mesh and looks like it works.
Until it is updated to 18.10 (or me downgrade to 18.04) I can do my job. Thanx man!

[bernd]

It is not magic at all, you just need a gmsh binary with occt support which you seam to get if you download it from gmsh home page.

bernd

[kkremitzki]

The Community Extras PPA is missing Gmsh 4 for 18.10 which is a bug, I can get to it later but feel free to create an issue in our bug tracker and assign it to me.