uhm..

open MED => select vertex Mode => click on "Create vertex" icon => Place vertex to the model (leftklick = creating)

Then just place the vertex right, and note his ID

The ID is shown in the lower right of the MED Window, after selecting one vertex.
Shown like this (ABCD == the ID number you need to write down):
Code:
Vertex #ABCD



now just use vec_for_vertex with the Vertex IDs...

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