public class Vec3f extends Tuple3f {

    public Vec3f() {
       super();
    }
    public Vec3f(float x, float y, float z) {
       super(x, y, z);
    }
    public Vec3f(Vec3f v) {
       x = v.x; y = v.y; z = v.z;
    }

    public void normalize()
    {
       float len = x*x + y*y + z*z;
       len = 1.0F/(float)Math.sqrt(len);
       x *= len; y *= len; z *= len; 
    }

    public final void add(Tuple3f t1) {
      super.add(t1);
      normalize();
    }

    public static final Vec3f add(Vec3f t1, Vec3f t2) {
      Vec3f t = new Vec3f(t1);
      t.add(t2);
      t.println("Local add");
      return t;
    }
    public static final Tuple3f sub(Vec3f t1, Vec3f t2) {
      Vec3f t = new Vec3f(t1);
      t.sub(t2);
      return t;
    }

    public final void sub(Tuple3f t1) {
	super.sub(t1);
      normalize();
    }

    public static void main(String argv[])
    {
      Vec3f t1 = new Vec3f (2.1F, 3.4F, 2.2F);
      Vec3f t2 = new Vec3f ();
      t2.add(t1);

      t1.println("t1: ");
      t2.println("t2: ");

      Tuple3f tu0 = add((Tuple3f) t1, (Tuple3f)t2);
      tu0.println("tu0: ");

      t1.println("t1: ");
      t2.println("t2: ");

      Vec3f t = add(t1, t2);
      t.println("t: ");
      
    }


    
}