class_docstr: Class to support multiple render passes for a renderer.
  
  Notes
  -----
  Passes are organized here as "primary" (vtkOpenGLRenderPass) that act
  within the renderer and "post-processing" (vtkImageProcessingPass) passes,
  which act on the image generated from the renderer.
  
  The primary passes are added as part of a vtk.vtkRenderPassCollection or
  are "stacked", while the post-processing passes are added as a final pass
  to the rendered image.
  
  Parameters
  ----------
  renderer : vtk.vtkRenderer
      Renderer to initialize render passes for.
docstr: Enable super-sample anti-aliasing pass.
  
  Returns
  -------
  vtk.vtkSSAAPass
      The enabled super-sample anti-aliasing pass.
docstr_tok: ["Enable","super-sample","anti-aliasing","pass",".","Returns","--","--","--","-","vtk.vtkSSAAPass","The","enabled","super-sample","anti-aliasing","pass","."]
code: def enable_ssaa_pass(self):
      """Enable super-sample anti-aliasing pass.
  
      Returns
      -------
      vtk.vtkSSAAPass
          The enabled super-sample anti-aliasing pass.
  
      """
      if self._ssaa_pass is not None:
          return
      self._ssaa_pass = _vtk.vtkSSAAPass()
      self._add_pass(self._ssaa_pass)
      return self._ssaa_pass
  
imports: import weakref
  from .None import _vtk
label_desc: Use image node_id 18 for calling the RenderPasses obj's underlying member method code with example usage: obj.enable_ssaa_pass() and returns: self