Algodoo

basic lock on system using magnets. use it yourself in your scenes as long as you give credit simply attach a gun that doesnt have collision groups a or g and make a vehicle of some form it can shoot at, the boxes atm have controller accelataors working on wasd and the gun can be manually moved with arrow keys.
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edit:also the force field stops the magnet sending everything flying, but fires them away so they dont stick to it