code: def set_initial_values(self):
          
          self.normals = self.data['normals']
          self.vectors = numpy.ones((
              self.data['vectors'].shape[0],
              self.data['vectors'].shape[1],
              self.data['vectors'].shape[2] + 1
          ))
          self.vectors[:, :, :-1] = self.data['vectors']
          self.attr = self.data['attr']
          return
docs: Set initial values form existing self.data value
          :return: None