code: def loadNeutral(filename, c="gold", alpha=1, wire=False, bc=None):
      
      if not os.path.exists(filename):
          colors.printc("~noentry Error in loadNeutral: Cannot find", filename, c=1)
          return None
  
      coords, connectivity = convertNeutral2Xml(filename)
      poly = buildPolyData(coords, connectivity, indexOffset=0)
      return Actor(poly, c, alpha, wire, bc)
docs: Reads a `Neutral` tetrahedral file format. Return an ``Actor(vtkActor)`` object.