+ Entity orb;
+ orb.vel = Vector<float>(-19, 19);
+ orb.mass = 1;
+ world.AddEntity(orb);
+
+ Entity coll;
+ coll.pos = Vector<float>(250, -25);
+ coll.vel = Vector<float>(-10, 0);
+ coll.mass = 2;
+ world.AddEntity(coll);
+
+ cout << "normal at top: " << world.NormalAt(Vector<float>(250, 30)) << endl;
+ cout << "normal at left: " << world.NormalAt(Vector<float>(30, 250)) << endl;
+