Round-bars can be used as connection points for cables where:

  1. the cable is allowed to slide over the bar in the length direction

  2. the cable is allowed to disconnect from the bar.

This is demonstrated in the following video:


A round-bar node is a special case of the circle node. A circle can be transformed into a round-bar by checking the “is a round bar” box:


Note that a round-bar has infinite length, even though it is drawn only in the specified region.


A roundbar can be used as a connection in a cable (or slinggrommet or riggingstring) in the same way as Circle nodes but with the following limitations:

  • Geometry shall be valid without the round-bar

  • Never two round-bars after each-other (the node following a round bar shall not be a round bar)

  • Always between two non-roundbar nodes

The active side#

A round-bar is active when its edge passes at the positive side of the cable. The positive side is the cross-product of the cable segement direction and the bar axis. The positive side may be reversed by setting the roundbar’s ‘reversed’ property to True.



This policy extends beyond the points as well. In that case there is a jump in the solution at the roundbar when the roundbar is (de)activated:



See Circle : Circle