text: # https://github.com/stevenlovegrove/Pangolin/tree/master/examples/SimpleScene
  
  import OpenGL.GL as gl 
  import pangolinpy as pangolin
  
  
  
  def main():
      pangolin.CreateWindowAndBind('Main', 640, 480)
      gl.glEnable(gl.GL_DEPTH_TEST)
  
      # Define Projection and initial ModelView matrix
      scam = pangolin.OpenGlRenderState(
          pangolin.ProjectionMatrix(640, 480, 420, 420, 320, 240, 0.2, 100),
          pangolin.ModelViewLookAt(-2, 2, -2, 0, 0, 0, pangolin.AxisY))
  
      tree = pangolin.Renderable()
      tree.Add(pangolin.Axis())
  
      # Create Interactive View in window
      handler = pangolin.SceneHandler(tree, scam)
      dcam = pangolin.CreateDisplay()
      dcam.SetBounds(0.0, 1.0, 0.0, 1.0, -640.0 /480.0)
      dcam.SetHandler(handler)
  
      def draw(view):
          view.Activate(scam)
          tree.Render()
      dcam.SetDrawFunction(draw)
  
      while not pangolin.ShouldQuit():
          gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT)
  
          # or
          # dcam.Activate(scam)
          # tree.Render()
  
          pangolin.FinishFrame()
  
  
  
  
  if __name__ == '__main__':
      main()