If I have a projectile shot in a vacuum-box that has no gravity or wind resistance inside it (lets say the box is 1000 units tall and 1000 units wide), with the only rule being that the projectile bounces off the sides of the box how do I solve for the angles that will hit any target inside the box from a projectile launched at any point inside the box, in less than or equal to 1 side-bounces?
Of course, shooting at any angle would eventually hit the target because the projectile would bounce around forever until finally meeting the target, I'm looking for the angles that result in a single side-bounce only.