distanceToSquared method

@override double distanceToSquared(Vector v)

Implementation

@override
double distanceToSquared(Vector v) {
  final dx = x - v.x;
  final dy = y - v.y;
  double dz = z;
  if(v is Vector3){
    dz-= v.z;
  }
  else if(v is Vector4){
    dz-= v.z;
  }
  final distance = dx * dx + dy * dy + dz * dz;
  return distance;
}