docstr: Set the visibility of this item.
code: def setVisible(self, vis):
      """Set the visibility of this item."""
      self.__visible = vis
      self.update()
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 21 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.setVisible(vis) without return types