LibGDX smart collision detection actors -

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so i'm creating towerdefence-game lot(5-25) towers exist.

now i'm trying think of smart way handle collision detection, meaning spawning creature in range.

the obvious way (for me @ least) create list of creatures , list of towers, every tower checks, if creature in reach.

but i'm pretty 20 towers game crash (especially on smartphone), since tower collision-checks every frame.

isn't there kind of way, tower waits collision, , if happens, reacts on it? (like listener, collisions)


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