Need Help! GH_Python : Using global List

@lepli wrote:

Hi,

I'm writing a code to generate simple branch structure in grasshopper.
I use couple of 'global list variable' to store lines and points.
The list for points is fine, but the list for curves only stores 'null'.
Please see the screenshot and code below. Thanks for your help in advance.

---

import rhinoscriptsyntax as rs
import Rhino.Geometry as rg
import random as rnd

if go :

wanderpt (attr, walkingDist)
checkdistandaggr(attr, boundary, min_dist)

else:
aggr = []
lines = []

wander_pt = rg.Curve.PointAt(boundary, rnd.uniform(0, 1))
aggr.append(attr)

a = wander_pt
b = lines
c = aggr

def wanderpt (attr, scaleDist) :
global wander_pt

vec = rs.VectorCreate(attr, wander_pt)
vec = rs.VectorUnitize(vec)
vec = rs.VectorScale(vec, scaleDist)
ang = rnd.uniform(-75, 75)
vec = rs.VectorRotate(vec, ang, rs.VectorCreate( [0,0,1], [0,0,0]))

wander_pt = rs.VectorAdd(vec, wander_pt)

def checkdistandaggr(attr, boundary, m_dist) :

global wander_pt
global aggr
global lines


for i in range(len(aggr)):
    dist = rs.Distance(wander_pt, aggr[i])

    if dist < m_dist:

        lines.append(rs.AddLine(wander_pt, aggr[i]))
        aggr.append(wander_pt)
        wander_pt = rg.Curve.PointAt(boundary, rnd.uniform(0, 1))
        break

exe.jpg2732x1488 492 KB

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