Algodoo

I'm happy that you decided to come back to Algobox and become active again! There are not very many "technical" people here any more. It has become overrun by young children posting simple scenes of cartoon stick men or marbles.

Anyhow, there seems to be a couple of problems with this scene, unless I'm not using it correctly. The first is that neither laser follows the cursor exactly where it points. They are both off-target by at least 30 to 50 degrees. And the other issue is the fact that the lasers do not function at all beyond about 210 or 220 meters. Beyond that range, the lasers just point along the ground. But even though the lasers do not point as expected, the projectiles do hit whichever target that the mouse cursor is pointing to! That is quite impressive!

Any idea what might be happening?

Well, the pointing towards the ground is to be expected - you are going out of the range of the mathematical function, which I believe just returns zero in that case.

Being off target (not pointing towards the mouse) is wholly expected - it uses ballistics rather than pointing directly, to counteract gravity!