code: def add_actor(self):
      self.ren.AddActor(self.actor)
  
imports: import vtk
  import json
  import numpy
  import argparse
  import sys
  import subprocess
  from plyfile import PlyData
label_desc: Use image node_id 10 for calling the Render obj's underlying member method code with example usage: obj.add_actor() without return types