normalize function

List<double> normalize(List<double> out, List<double> a)

Normalize a vec4

@param {vec4} out the receiving vector @param {ReadonlyVec4} a vector to normalize @returns {vec4} out

Implementation

List<double> normalize(List<double> out, List<double> a) {
  final x = a[0];
  final y = a[1];
  final z = a[2];
  final w = a[3];
  double len = x * x + y * y + z * z + w * w;
  if (len > 0) {
    len = 1 / math.sqrt(len);
  }
  out[0] = x * len;
  out[1] = y * len;
  out[2] = z * len;
  out[3] = w * len;
  return out;
}