# FEM Mesh CalculiX

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## FEM element types in CalculiX

For detailed information on FreeCAD FEM elements see FEM Mesh and FEM Element Types. For CalculiX specific questions you may try the Discourse group or the Discord channel.

### Segment element

 seg2 FreeCAD nodes seg3 FreeCAD nodes seg2 (B31) CalculiX nodes seg3 (B32) CalculiX nodes FreeCAD → CalculiX, Nodes N1, N2 N1, N3, N2

### Triangle element

 tria3 FreeCAD nodes tria6 FreeCAD nodes tria3 (S3) CalculiX nodes tria6 (S6) CalculiX nodes FreeCAD → CalculiX, Nodes N1, N2, N3 N1, N2, N3, N4, N5, N6

### Tetrahedron element

The following node order is not implemented ! TODO: verify node order (do not forget getccxVolumesByFace()).

 tetra4 FreeCAD nodes tetra10 FreeCAD nodes tetra4 (C3D4) CalculiX nodes tetra10 (C3D10) CalculiX nodes FreeCAD → CalculiX, Nodes N2, N3, N4, N1 N2, N3, N4, N1, N6, N10, N9, N5, N7, N8

### Hexahedron element

 hexa8 FreeCAD nodes hexa20 FreeCAD nodes hexa8 (C3D8) CalculiX nodes hexa20 (C3D20) CalculiX nodes FreeCAD → CalculiX, Nodes N6, N7, N8, N5, N2, N3, N4, N1 N6, N7, N8, N5, N2, N3, N4, N1, N14, N15, N16, N13, N10, N11, N12, N9, N18, N19, N20, N17

### Pentahedron element

 penta6 FreeCAD nodes penta15 FreeCAD nodes penta6 (C3D6) CalculiX nodes penta15 (C3D15) CalculiX nodes FreeCAD → CalculiX, Nodes N5, N6, N4, N2, N3, N1 N5, N6, N4, N2, N3, N1, N11, N12, N10, N8, N9, N7, N14, N15, N13