FEM FemMesh2Mesh

    From FreeCAD Documentation

    FEM FemMesh2Mesh.svg FEM FemMesh2Mesh

    Menu location
    Mesh → FEM mesh to mesh
    Default shortcut
    Introduced in version
    See also
    FEM tutorial


    This tool converts surfaces of 3D elements of a selected FEM mesh to mesh, or converts 2D FEM mesh to mesh. Internally it picks FEM mesh element faces which are unique (not shared by two elements) and uses them to create faces of a mesh. Optionally it allows to create a deformed mesh caused by the action of the defined forces. This is done by adding the displacement of the FEM results to the mesh nodes (scale of the displacement can be set by Python).


    1. Select a FEM mesh object.
    2. Optionally also select the FEM results.
    3. There are several ways to invoke the command:
      • Press the FEM FemMesh2Mesh.svg FEM mesh to mesh button.
      • Select the Mesh → FEM FemMesh2Mesh.svg FEM mesh to mesh option from the menu.


    Note: The parameter scale was introduced in version 0.21. For older versions of FreeCAD omit it from your code.

    When you just require the displacement scale factor, check your mesh object name and the scale factor in the following code:

    import femmesh.femmesh2mesh
    mesh_obj = FEMMeshGmsh  # the name of your mesh object
    scale = 5  # displacement scale factor
    out_mesh = femmesh.femmesh2mesh.femmesh_2_mesh(FreeCAD.ActiveDocument.mesh_obj.FemMesh, FreeCAD.ActiveDocument.CCX_Results, scale)
    import Mesh

    The cantilever example:

    from os.path import join
    the_file = join(FreeCAD.getResourceDir(), "examples", "FemCalculixCantilever3D.FCStd")
    fc_file = FreeCAD.openDocument(the_file)
    fem_mesh = fc_file.getObject("Box_Mesh").FemMesh  # do not remove the _
    result = fc_file.getObject("CCX_Results")
    scale = 1  # displacement scale factor
    from femmesh import femmesh2mesh
    out_mesh = femmesh2mesh.femmesh_2_mesh(fem_mesh, result, scale)
    import Mesh