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How to select only nodes on the surface

Some times you need to select nodes only on the surface of the mesh. This can be done when the mesh is displayed in the surface mode (see ''Toggle Surfaces/Volumes'') using the menu-entry ''Show Elements With Light''. To find node positions more easily add the element edges to the view (see Toggle Element Edges).

A different way uses the element-faces (see ''plot'' with parameter ''f''). Store the desired faces in a new set (qadd) and complete the set downwards (``comp set do''). Check the selected nodes with ``plot n setname''.