docstr: Indicates that this item needs to be redrawn, and schedules an update 
  with the view it is displayed in.
code: def update(self):
      """
      Indicates that this item needs to be redrawn, and schedules an update
      with the view it is displayed in.
      """
      v = self.view()
      if v is None:
          return
      v.update()
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 28 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.update() without return types