// Vector.java

public class Vector {
   public Vector ()
   {  epsilon = 1E-007F;  x = 0.0F;  y = 0.0F;  z = 0.0F;  w = 1.0F;  }

   public Vector (float f, float f1, float f2)
   {  epsilon = 1E-007F;  x = f;  y = f1;  z = f2;  w = 1.0F;  }

   public Vector (float f, float f1, float f2, float f3)
   {  epsilon = 1E-007F;  x = f;  y = f1;  z = f2;  w = f3;  }

   public final void add (Vector vector)
   {  x += vector.x;  y += vector.y;  z += vector.z;  }

   public final void cross (Vector vector, Vector vector1)
   {  vector1.x = y * vector.z - z * vector.y;
      vector1.y = z * vector.x - x * vector.z;
      vector1.z = x * vector.y - y * vector.x;
   }

   public final float dot (Vector vector)
   {  return x * vector.x + y * vector.y + z * vector.z;  }

   public final void load (Vector vector)
   {  x = vector.x;  y = vector.y;  z = vector.z;  w = vector.w;  }

   public final float magnitude ()
   {  return (float)Math.sqrt (x * x + y * y + z * z);  }

   public final float magnitudeSquared ()
   {  return x * x + y * y + z * z;  }

   public final void normalize ()
   { float f = (float)Math.sqrt (x * x + y * y + z * z);
      if (f > epsilon) {
        float f1 = 1.0F / f;
         x *= f1;  y *= f1;  z *= f1;
      }
   }

   public void scale (float f)   {x *= f;  y *= f;  z *= f;}

   public final void set (float f, float f1, float f2)
   {  x = f;  y = f1;  z = f2;  w = 1.0F;  }

   public final void set (float f, float f1, float f2, float f3)
   {  x = f;  y = f1;  z = f2;  w = f3;  }

   public final void subtract (Vector vector)
   {  x -= vector.x;  y -= vector.y;  z -= vector.z;  }

   public float x, y, z, w, epsilon;
}