Rhino 7 - ChainEdges selection is broken

See the attached video. The 3 green curves were just made with the “Adjustable curve blend” tool and have perfect G2 continuity with the white curves. Once I try to create a single pipe using the “Pipe” tool and its “SelectChain” option, Rhino fails to select all the curves.
However, if I run the '_SelChain command outside the “Pipe” tool, then it works as expected and selects the entire loop of curves. It seems like there is a bug in the “SelectChain” option of the “Pipe” tool.


It’s Rhino 7 file:
Chain edges fail during Pipe command.3dm (54.0 KB)

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Hi Bobi,
Same results here…broken!
Rhino 7 SR5 2021-3-9 (Rhino 7, 7.5.21068.13001
Be safe!

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I also use Rhino 7.5.21068.13001, 2021-03-09.


  • It works in 6.34.21034.7001, 2/3/2021
  • Not in 8.0.21068.12305, 2021-03-09