public float dot_product(Vector3d vct2)
{
// v1->.v2-> = x1*x2 + y1*y2 + z1*z2
// How to call :
// Vector3d v1 = new Vector3d(1,0,0);
// Vector3d v2 = new Vector3d(0,1,0);
// v1.dot_product(v2) return float 0
return this.get_x()*vct2.get_x()
+ this.get_y()*vct2.get_y()
+ this.get_z()*vct2.get_z();
}
public Vector3d cross_product(Vector3d vct2)
{
// How to call :
// Vector3d v1 = new Vector3d(1,0,0);
// Vector3d v2 = new Vector3d(0,1,0);
// v1.cross_product(v2) return Vector3d (0 0 1)
Vector3d vct = new Vector3d(0,0,0);
// v1->^v2-> = v->
// vx = y1 z2 - y2 z1
vct.set_x( this.get_y() * vct2.get_z() - vct2.get_y() * this.get_z() );
// vy = z1 x2 - x1 z2
vct.set_y( this.get_z() * vct2.get_x() - this.get_x() * vct2.get_z() );
// vz = x1 y2 - y1 x2
vct.set_z( this.get_x() * vct2.get_y() - this.get_y() * vct2.get_x() );
return vct;
}
