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Create and edit a chains and boundaries

Chains and boundaries are connected lines based on a set of segments. The main difference is that
a boundary is always closed and chains are not.


  1. Select the segments you want to add to a chain or boundary. Clicking twice on the same segment will remove the segment itself
  2. Press Enter (or right-click) to create the chain/boundary/exit editing

Chain tutorial


  • The chains/boundary infrastructure depends highly on the topology of the curve. For example,
    you may need to click twice in parts of a closed curve that looks continuous but, since every curve
    has a beginning and an end, the two parts are different segments.
  • While selecting segments it is possible to use the undo (Ctrl + Z) function to remove the last

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