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Chipmunk Physics • View topic - Double collision detection

Double collision detection

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Double collision detection

Postby ucode » Mon Oct 29, 2012 8:42 pm

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Re: Double collision detection

Postby slembcke » Mon Oct 29, 2012 9:59 pm

Hmm. I assume #add_collision_func is a compatibility function that wraps the now very old Chipmunk API function of the same name. The way that worked is that it would call the callback for every frame that things are overlapping. Without seeing more code (yours and the binding), I can't say either way if this was happening or not.

There should be something that wraps the much newer collision handler functionality (cpSpaceAddCollisionHandler()) which lets you register separate begin, preSolve, postSolve, and separate callbacks. Begin callbacks are guaranteed to be called only once.
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Re: Double collision detection

Postby ucode » Tue Oct 30, 2012 3:58 pm

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Re: Double collision detection

Postby ucode » Tue Oct 30, 2012 5:13 pm

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Re: Double collision detection

Postby slembcke » Tue Oct 30, 2012 5:17 pm

Do you have multiple shapes on your object? Contacts are tracked per pair of shapes. If you have a composite object, you need to increment a counter on begin and decrement it on separate. When you go from 0 -> 1 you know it's the first contact, and when you go from 1 -> 0 you know it's the final contact separating.
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Re: Double collision detection

Postby ucode » Tue Oct 30, 2012 5:45 pm

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Re: Double collision detection

Postby slembcke » Tue Oct 30, 2012 6:10 pm

Hmm. Single shape on each object should only produce one callback yeah. Also you don't need to check if it's the first contact in a begin callback. That will always be true.

You should try printing out the shapes on the arbiter to check that it's not the same pair of objects. Also implement the separate callback event to log something as well so you know that isn't happening in between unexpectedly. Is it possible that the object is bouncing?
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Re: Double collision detection

Postby ucode » Tue Oct 30, 2012 7:52 pm

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Re: Double collision detection

Postby ucode » Tue Oct 30, 2012 8:05 pm

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Re: Double collision detection

Postby ucode » Wed Oct 31, 2012 6:17 am

So how can I move my player away from the other object when a collision occurs without my collision handler being called twice?
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