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ball bounce

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I can make a 2D program where a ball bounces off walls and other solid objects. I want to also add another ball and I want that ball to bounce off the other ball if it collides. All movements can only be in 4 diagonal directions . A ball collides into the other ball then it changes direction .. I can foresee balls bouncing in odd directions or through walls so what direction should a ball bounce if it hits another object and also a wall at around same time

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Yes when you detect a collision you usually flip the velocity vector on the moving object to simulate it.

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