Ok, so to sum it up:

  • For remote attachment the remote node is created via an RBE3 element which gathers the interface nodes into one (its behavior will be flexible or rigid depending on which is selected)
  • Direct attachment only works for one-node interfaces
  • If the interface has just one node, there is no physical difference between remote and direct attachment since a remote node will behave in the same way as the original node
  • For a fixed joint, the two resulting nodes (one on each side) are rigidly connected

Is that correct?