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I am trying to find out collision detection between specific objects and when they are colliding then want to invoke a specific method.

I have read one this tutorial but I don't understand how to use it with one ball and one cylinder on iPhone. How can I do this?

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You forgot to add a question, so I added one for you. Is there any more details you can share: what did you try so far? Is there something special that is blocking you? Did you try going from a more simple collision (e.g. box-box) and build up from there? – Laurent Couvidou Dec 14 '12 at 10:13
I just want to know that how to invoke any method when ball is touching any object and to get information about that object to whom ball is touching? – iPhoneBuddy Dec 19 '12 at 6:57

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