text: """
  Display one 3-D volume layer using the add_volume API
  """
  
  import numpy as np
  import scipy.ndimage as ndi
  import napari
  
  
  with np.load('data/vispy_volumes/stent.npz') as array:
      stent = array["data"]
  
  stent_small = ndi.zoom(stent, 0.5)
  
  print(stent.shape, stent_small.shape)
  
  # with np.load('data/vispy_volumes/mri.npz') as array:
  #     mri = array["data"]
  
  #vessel_tree = np.load('data/vispy_volumes/vessel_tree_noise.npy')
  #vessel_tree = np.load('data/vispy_volumes/skeleton_vessel_tree_noise.npy')
  
  
  with napari.gui_qt():
      viewer = napari.Viewer(axis_labels='zyx')
  
      # # add an image first
      # viewer.add_image(stent)
  
      # add the volume
      print(stent.shape)
      viewer.add_image(stent, name='stent')
      viewer.add_image(stent_small, name='stent_small', scale=[2, 2, 2], translate=[128, 0, 128])
      viewer.add_image(stent_small, name='stent_small_2', scale=[2, 2, 2], translate=[0, 0, 256])
      viewer.ndisplay = 2
      
      # add an image second first
      #viewer.add_image(np.random.random((10, 100, 200)))
  