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I'm using Box2D.

I think it's something to do with wall's fixture definition, but when a ball goes toward a wall at a 45 degree angle, I would expect it to bounce off at 135 degrees, but it always goes 90 degrees against wall. Why would this be?

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I was setting a large restitution value (greater than 1), that caused the problem.

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Even if it seems silly, you should mark this the answer to your problem. – William 'MindWorX' Mariager Jan 16 '12 at 3:44
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@MindWorX I understand that but system does not allow me to do it until two days after writing the question. – Paul Jan 16 '12 at 4:37

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