code: def __call__(self):
      self._prepare()
      self.iren.Initialize()
      self.renWin.Render()
      self.ren.GetActiveCamera().SetPosition(15.0, 10.0, 9.0)
      self.ren.GetActiveCamera().SetViewUp(0.1, 0.0, 1.0)
      self.renWin.Render()
      self.iren.Start()
  
imports: import vtk
  import json
  import numpy
  import argparse
  import sys
  import subprocess
  from plyfile import PlyData
label_desc: Use image node_id 2 for calling the Render obj's underlying member method code with example usage: obj.__call__() without return types