docs: def translate_x(self, d):
          """Translate mesh for x-direction
  
          :param float d: Amount to translate
          """
          mat = numpy.array([
              [1, 0, 0, 0],
              [0, 1, 0, 0],
              [0, 0, 1, 0],
              [d, 0, 0, 1]
          ])
          self.vectors = self.vectors.dot(mat)
          return self