Physical groups are collections of mesh entities (points, curves, surfaces and volumes). Data Groups Of Nodes: All nodes and not only the elements will be saved for each physical mesh group.The default 0.0 means that Gmsh's default of 1e-8 is used. Data Geometrical Tolerance: The geometrical tolerance for the mesh to match the object edges.Use either 1st order meshes then, or check the FreeCAD Wiki page for the solver equation for possible options to handle 2nd order meshes. This means the solver equation cannot handle 2nd order meshes. Note: If you use the solver Elmer you may get this error: ERROR:: GetEdgeBasis: Can't handle but linear elements, sorry. This property can also be changed in the Gmsh dialog in the field Mesh order. Data Element Order: The mesh element order.From Shape (default) the dimension will be determined from the dimension of the object that is meshed.This property can also be changed in the Gmsh dialog in the field Mesh element dimension. Data Element Dimension: The dimension of the mesh elements.true (default) duplicate mesh nodes will be removed.This property can also be changed in the Gmsh dialog in the field Min element size. If set to 0.0, the size will be set automatically. Data Characteristic Length Min: The minimal size of the mesh elements.This property can also be changed in the Gmsh dialog in the field Max element size.
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