Treehelpers th.list_to_tree is failing to output in Grasshopper

Scripting
,
1

I have implemented Treehelpers in a python script (attached). I am running the script in a GhPython component. When I connect a panel to an output named x, I have a null value, thogh when I print the list of lists, I get values (see screenshot). This means to me that the failure is in my use of Treehelpers.

I don’t see how my script differs from this https://developer.rhino3d.com/guides/rhinopython/grasshopper-datatrees-and-python/

Anyone know what’s going on?

image
image2532×992 233 KB

treehelpers_test.py (582 Bytes)
treehelpers_test.3dm (269.7 KB)
treehelpers_test.gh (6.0 KB)

2

the variable x inside the Function “Main” has not the expected scope.

check some info on “scope”.

is this what you re after ?

import Rhino.Geometry as rg
import rhinoscriptsyntax as rs
import random
import Rhino
import ghpythonlib.treehelpers as th
import System
import scriptcontext as sc

def FindObjs():
    layerTree = []
    layernames = ["CurveLayer1", "CurveLayer2","CurveLayer3"]
    for i in range(len(layernames)):
        objs = Rhino.RhinoDoc.ActiveDoc.Objects.FindByLayer(layernames[i])
        
        if objs:
            geoms = [obj.Geometry for obj in objs]
            layerTree.append(geoms)
    print(layerTree)
    return th.list_to_tree(layerTree, source=[0,0])
    
    
x = FindObjs()
2 Likes
3

@Tom_P Thank you!

I do know scope in Python, but I overlooked the need for a returned value here. This solves my problem