Relative paths appearing in Gmsh .geo files are relative to the .geo
file, not relative to the cwd when the gmsh executable was invoked. This
is okay when using absolute paths with the default "Temporary
directories" mode, but if one selects (in Preferences -> FEM) "Beside
.FCStd file", then relative paths are written to the .geo file. This
causes a (suppressed in FreeCAD output) warning from Gmsh that the brep
file is missing as well as the error:
Unexpected error when creating mesh: File to load not existing or not readable: partname/FEMMeshGmsh/BaseFeature_Mesh.unv
In this commit we just use relative paths, which is also convenient if
users move these files elsewhere (e.g., to work directly with advanced
features in Gmsh).
I sometimes use the FEM workbench to create meshes for a problem that
I'll solve with an external FE solver that doesn't yet have workbench
integration, or to prepare a Gmsh file for tweaks from directly running
Gmsh. The .unv format is pretty limited on technical grounds so I rename
the file to .msh (can express everything Gmsh can) or a
parallel-friendly format. Explicitly setting Mesh.Format = 2 is
confusing because this line also needs to be fixed (or deleted) when
renaming the output file name.
- no longer output an error on mesh from a BooleanFragments. There are cases when this fails, but other cases where one must use a BoopleanFragments compound and this works well, see https://forum.freecad.org/viewtopic.php?t=71070. Therefore a warning is sufficient.
- disable log messages not important for the average users.
- avoid code duplication
* [FEM] add support for 3D recombinations
currently we only support surface recombinations but for some applications 3D recombinations are useful as well
* add support for the recombination algorithms
using a sensible algorithm is important to get useful results, see https://wiki.freecadweb.org/FEM_MeshGmshFromShape#Properties
where I described examples
- Gmsh has since a while 2 new mesh algorithms
- on the other hand the two algorithms ""Frontal Delaunay" and "Frontal Hex" are deprecated and not listed anymore in the docs: https://gmsh.info/doc/texinfo/gmsh.html#index-Mesh_002eAlgorithm3D
and indeed all attempts with these 2 algorithms fail
