text: # -*- coding: utf-8 -*-
  # -----------------------------------------------------------------------------
  # Copyright (c) 2015, Vispy Development Team. All Rights Reserved.
  # Distributed under the (new) BSD License. See LICENSE.txt for more info.
  # -----------------------------------------------------------------------------
  
  """
  This example demonstrates how to create a sphere.
  """
  
  import imageio
  
  from vispy import scene
  from vispy.visuals.transforms import STTransform
  
  output_filename = 'animation.gif'
  n_steps = 18
  step_angle = 10.
  axis = [0, 0.707, 0.707]
  
  canvas = scene.SceneCanvas(keys='interactive', bgcolor='white',
                             size=(800, 600), show=True)
  
  view = canvas.central_widget.add_view()
  view.camera = 'arcball'
  
  sphere1 = scene.visuals.Sphere(radius=1, method='latitude', parent=view.scene,
                                 edge_color='black')
  
  sphere2 = scene.visuals.Sphere(radius=1, method='ico', parent=view.scene,
                                 edge_color='black')
  
  sphere3 = scene.visuals.Sphere(radius=1, rows=10, cols=10, depth=10,
                                 method='cube', parent=view.scene,
                                 edge_color='black')
  
  sphere1.transform = STTransform(translate=[-2.5, 0, 0])
  sphere3.transform = STTransform(translate=[2.5, 0, 0])
  
  view.camera.set_range(x=[-3, 3])
  
  writer = imageio.get_writer('animation.gif')
  for i in range(n_steps * 2):
      im = canvas.render()
      writer.append_data(im)
      if i >= n_steps:
          view.camera.transform.rotate(step_angle, axis)
      else:
          view.camera.transform.rotate(-step_angle, axis)
  writer.close()
  