isOnlyTransformScale = (matrix) => (

  // TODO check if it is worth the effort to add recognition of 90 deg rotations

  isZero(matrix[1]) && isZero(matrix[2]) && isZero(matrix[3]) &&
  isZero(matrix[4]) && isZero(matrix[6]) && isZero(matrix[7]) &&
  isZero(matrix[8]) && isZero(matrix[9]) && isZero(matrix[11]) &&
  matrix[15] === 1
)
Determine whether the given matrix is only translate and/or scale.
This code returns true for TAU / 2 rotation as it can be interpreted as scale.

@param {mat4} matrix - the matrix
@returns {Boolean} true if matrix is for translate and/or scale
@alias module:modeling/maths/mat4.isOnlyTransformScale