docstr: Make this item visible if it was previously hidden.
  This is equivalent to setVisible(True).
code: def show(self):
      """Make this item visible if it was previously hidden.
      This is equivalent to setVisible(True)."""
      self.setVisible(True)
  
imports: from OpenGL.GL import *
  from OpenGL import GL
  from ..None import Transform3D
  from ..Qt import QtCore
label_desc: Use image node_id 20 for calling the GLGraphicsItem obj's underlying member method code with example usage: obj.show() without return types