code: def on_draw(self, event):
      gloo.clear()
      self.program.draw("triangles", indices=self.faces)
  
file_path: vispy/examples/demo/gloo/brain.py
imports: from timeit import default_timer
  import numpy
  from vispy import gloo
  from vispy import app
  from vispy.util.transforms import perspective, translate, rotate
  from vispy.io import load_data_file
label_desc: Use image node_id 6 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(event) without return types