AddVector example from Python 101

Dear all,

I am following the example from python 101.

something is goint wrong in some example below and nothing happen when I excute 'start debugging'...dose anyone knows whats the problem?

example on page 39:

def AddVector(vecdir, base_point=[0,0,0]):
    tip_point = rs.PointAdd(base_point, vecdir)
    line = rs.AddLine(base_point, tip_point)
    if line: return rs.CurveArrows(line, 2)

example on page 40:

import rhinoscriptsyntax as rs

# This script will compute a bunch of cross-product vector based on a pointcloud

def vectorfield():

cloud_id = rs.GetObject("Input pointcloud", 2, True, True)

if cloud_id is None: return

listpoints = rs.PointCloudPoints(cloud_id)

base_point = rs.GetPoint("Vector field base point")

if base_point is None: return

for point in listpoints:

vecbase = rs.VectorCreate(point, base_point)

vecdir = rs.VectorCrossProduct(vecbase, (0,0,1))

if vecdir:

vecdir = rs.VectorUnitize(vecdir)

vecdir = rs.VectorScale(vecdir, 2.0)

AddVector(vecdir, point)

Replies to This Discussion

Permalink Reply by djordje on October 23, 2013 at 3:47am

Just call the vectorfield() function in the end.
Also there is an extra indentation at "for point in listpoints:". Delete it. Like so:

import rhinoscriptsyntax as rs

def AddVector(vecdir, base_point=[0,0,0]):
    tip_point = rs.PointAdd(base_point, vecdir)
    line = rs.AddLine(base_point, tip_point)
    if line: return rs.CurveArrows(line, 2)

# This script will compute a bunch of cross-product vector based on a pointcloud

def vectorfield():
    cloud_id = rs.GetObject("Input pointcloud", 2, True, True)
    if cloud_id is None: return

    listpoints = rs.PointCloudPoints(cloud_id)
    base_point = rs.GetPoint("Vector field base point")
    if base_point is None: return
    for point in listpoints:
           vecbase = rs.VectorCreate(point, base_point)
           vecdir = rs.VectorCrossProduct(vecbase, (0,0,1))
           if vecdir:
               vecdir = rs.VectorUnitize(vecdir)
               vecdir = rs.VectorScale(vecdir, 2.0)
               AddVector(vecdir, point)


# call the second function:

vectorfield()