def check_visibility()

in image_generation/render_images.py [0:0]

• 14 lines of code
• 5 McCabe index (conditional complexity)

def check_visibility(blender_objects, min_pixels_per_object):
  """
  Check whether all objects in the scene have some minimum number of visible
  pixels; to accomplish this we assign random (but distinct) colors to all
  objects, and render using no lighting or shading or antialiasing; this
  ensures that each object is just a solid uniform color. We can then count
  the number of pixels of each color in the output image to check the visibility
  of each object.

  Returns True if all objects are visible and False otherwise.
  """
  f, path = tempfile.mkstemp(suffix='.png')
  object_colors = render_shadeless(blender_objects, path=path)
  img = bpy.data.images.load(path)
  p = list(img.pixels)
  color_count = Counter((p[i], p[i+1], p[i+2], p[i+3])
                        for i in range(0, len(p), 4))
  os.remove(path)
  if len(color_count) != len(blender_objects) + 1:
    return False
  for _, count in color_count.most_common():
    if count < min_pixels_per_object:
      return False
  return True