code: def read_mesh(self):
      plydata = None
      file_type = check_file_type(self.file)
      if not file_type:
          plydata = PlyData.read(self.file)
          self.file_type = (
              "pcd" if plydata["face"].count == 0 else "mesh"
          )
      else:
          self.file_type = file_type
  
      if self.file_type == "mesh":
          self.reader = vtk.vtkPLYReader()
          self.reader.SetFileName(self.file)
          self.reader.Update()
      else:
          if not plydata:
              plydata = PlyData.read(self.file)
          self.vertex = plydata["vertex"]
  
imports: import vtk
  import json
  import numpy
  import argparse
  import sys
  import subprocess
  from plyfile import PlyData
label_desc: Use image node_id 4 for calling the Render obj's underlying member method code with example usage: obj.read_mesh() without return types