openravepy not drawing lines when running inside a script [closed]

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Hello,

I have a very simple one pendulum example. I can plot it in python with the following code I borrowed from a website and called it plotfile.py :

import openravepy
import numpy as np

if __name__ == "__main__":
    env = openravepy.Environment()
    env.Load('env.xml')
    env.SetViewer('qtcoin')
    viewer = env.GetViewer()
    robot = env.GetRobots()[0]


    T = robot.GetLinks()[-1].GetTransform()
    colors = np.array([[1,0,0], [1,0,0]])
    linelist = np.array([T[0:3,3], T[0:3,3]+1.0])
    env.drawlinelist(linelist, 1, colors)

The drawlinelist from the script doesn't do anything. However, if I type

env.drawlinelist(linelist, 1, colors)

from the ipython console, the lines show up.

Any help would be greatly appreciated!!