I have to analyze simple geometries.  for example a beam.  the mesh divides the beam into elements that have the shape of a cube.  The nodes that have these cubes depend on "element order".  if I select "Linear" the cubes will have nodes only at the vertices, if I select "quadratic" in addition to the vertices, the cubes have nodes in the center of the segment (therefore they have 20 nodes).  I need these elements to have nodes also in the center of the faces and in the center of the cube itself.  to better explain myself I am attaching a drawing.