def vecMultiplyAdd(inVecA, inVecB, inMM):
  """returns inVecA + (inMM * inVecB)"""
  return [inVecA[0] + inMM * inVecB[0],
          inVecA[1] + inMM * inVecB[1],
          inVecA[2] + inMM * inVecB[2]]