docstr: Called by the GLViewWidget to draw this item.
  It is the responsibility of the item to set up its own modelview matrix,
  but the caller will take care of pushing/popping.
code: def paint(self):
      """
      Called by the GLViewWidget to draw this item.
      It is the responsibility of the item to set up its own modelview matrix,
      but the caller will take care of pushing/popping.
      """
      self.setupGLState()
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 27 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.paint() without return types