text: """
  Draw color arrow glyphs.
  """
  from vedo import *
  import numpy as np
  
  s1 = Sphere(r=10, res=8).c('white').wireframe()
  s2 = Sphere(r=20, res=8).c('white').wireframe().alpha(0.1).pos(0,4,0)
  
  coords1 = s1.points() # get the vertices coords
  coords2 = s2.points()
  
  # --- color can be a colormap which maps arrrow sizes
  t1 = 'Color arrows by size\nusing a color map'
  a1 = Arrows(coords1, coords2, c='coolwarm', alpha=0.4).addScalarBar(c='w')
  
  
  # --- get a list of random rgb colors
  nrs = np.random.randint(0, 10, len(coords1))
  cols = getColor(nrs)
  
  t2 = 'Color arrows by an array\nand scale them by half'
  a2 = Arrows(coords1, coords2, c=cols, scale=0.5)
  
  # draw 2 groups of objects on two renderers
  show([(s1, s2, a1, t1), (s1, s2, a2, t2)], N=2, bg='bb', bg2='lb')
  