How can offset the curve like this?

when i offset a curve,the left part is ok,but the right part is disappear!
how can people get the whole offset curve?
thank you!

Hello - - yeah, this is true in plain Rhino as well for this type of curve- in Rhino you can somewhat work around it by offsetting twice with different pick locations.


I think the “Clipper” plugin for Grasshopper will do this type of offset with poly lines.

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thankyou Helvetosaur,I intall it,it works very well

thankyou,Pascal Golay