code: def _prepare(self):
      print("Reading file...")
      self.read_mesh()
      self.set_mapper()
      self.set_actor()
      self.transform_actor()
      self.set_render()
      self.add_actor()
      self.draw_lines()
      self.init_coordinate_axes()
      print("Done")
  
imports: import vtk
  import json
  import numpy
  import argparse
  import sys
  import subprocess
  from plyfile import PlyData
label_desc: Use image node_id 3 for calling the Render obj's underlying member method code with example usage: obj._prepare() without return types