Hi…do you know how I can Join line a to b and c to d? …line comes from cad
Check out this thread: Join Lines with extend line
In your case group the curves, build a polycurve of each group, and close the polycurve with a line.
2 Likes
1 Like
What is the error?
it’s totally error… 
As i see in your dynamo you have the lines object as an dynamo element. That the first step 
. Second step you need to choose the two line n,eeds to joint, and use in to be input for the “close point node” as curve 1 and curve 2