identity = (out) => {
  out[0] = 1
  out[1] = 0
  out[2] = 0
  out[3] = 0
  out[4] = 0
  out[5] = 1
  out[6] = 0
  out[7] = 0
  out[8] = 0
  out[9] = 0
  out[10] = 1
  out[11] = 0
  out[12] = 0
  out[13] = 0
  out[14] = 0
  out[15] = 1
  return out
}
Set a matrix to the identity transform.

@param {mat4} out - receiving matrix
@returns {mat4} out
@alias module:modeling/maths/mat4.identity