How to check whether a curve is an arc or line or other types?

Justin-Yang · September 30, 2021, 5:34am

Hi friends, how to check whether a curve is an arc or line or other types in grasshopper? And output true or false. Thanks!

Adam_M · September 30, 2021, 5:58am

You could do something like this:

Justin-Yang · September 30, 2021, 6:00am

Thank you so much, Adam. That is exactly what I want.

jeremy5 · September 30, 2021, 10:29am

Hi @Justin-Yang,

One thing to be aware of: In R7 IsArc will return True for Arcs and for Nurbs Arcs (degree 3 Nurbs curves that describe arcs). In R6 it will be True for Arcs but False for Nurbs Arcs. See Arc can also be a 3 degree curve?

If the R6 behaviour is what you want, then you can do something like this:

Regards
Jeremy

Justin-Yang · October 2, 2021, 3:58pm

Thanks for this useful detail, Jeremy.