Finding the closest

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Jerome Squalor

ok I'm not completely sure how to explain tis buti'm gonna try...

I am making a 3D pong game.
I added powerups
One of the powerups creates a new ball
When there are to many balls the computer paddle can't figure out the right one to follow

I want it to follow the closest one to it.
How do i find the closest one of a bunch of types?(Or the biggest, fastest, slowest, farthest, etc....)