fromAngleRadians = (out, radians) => {
  out[0] = cos(radians)
  out[1] = sin(radians)
  return out
}
Create a new vector in the direction of the given angle.

@param {vec2} out - receiving vector
@param {Number} radians - angle in radians
@returns {vec2} out
@alias module:modeling/maths/vec2.fromAngleRadians