GHPython: PolyCurve is not iterable

[kev.r (Kevin)]

@efestwin

Printing out crv after the conversion to list shows that it’s just one PolyCurve in a list. I don’t know why, possibly a bug in treehelpers

This is normal when using treehelpers with simplified trees (no common root branch).

See explanation here:

Treehelpers with simplify

Hi Lukas, this is expected and is designed to work this way. Let’s see from the beginning: a “simplified tree” is not a normal tree anymore, it is a “forest”. There is no base branch (“trunk”?) in common anymore, so paths represent distinct trees. Grasshopper components alone, in fact, usually do not create this type of forests. To work with this type of “forest”, a base list in Python would always have to be created, to support these distinct routes. This is however unwelcome, because it woul…

And here:
https://gist.github.com/piac/ef91ac83cb5ee92a1294#gistcomment-3763417

Original code works with these changes (and changing input type hint to ghdoc as @efestwin pointed out):

import ghpythonlib.treehelpers as th
import rhinoscriptsyntax as rs

crv = th.tree_to_list(crv, lambda crv: crv)

a = []

for i,branch in enumerate(crv):
    
    for j,item in enumerate(branch):
        if rs.IsCurveClosed(item):
            bool = "closed"
            a.append(item)
        else:
            bool = "periodic"
            pts = list(rs.CurveEditPoints(item))
            pts.append(pts[0])
            a.append(rs.AddInterpCurve(pts,1,2))

ghpython_err_210912a.gh (493.1 KB)

-Kevin