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Chipmunk Physics • View topic - Clear cpSpace
Page 1 of 1

Clear cpSpace

PostPosted: Wed Apr 14, 2010 6:41 pm
by qwertyp

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 7:50 am
by slembcke
That should work just fine. Can you give any additional information? What does the debugger say?

Also, any real reason to reuse the space? It only takes a microsecond to release the old one and make a new one.

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 11:45 am
by qwertyp
I should clarify that I'm using Chipmunk on the iPhone, but without the Obj-C wrapper. When the 2 objects intersect, the app freezes and throws: EXC_BAD_ACCESS. The compiler says some code in cpArbiter is what caused it. At first, I thought I was trying to remove objects twice, which is why the if statement. However, that didn't help.

To answer your other question, there is no reason why I couldn't just remove the whole space, besides the fact I thought it would be faster not to.

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 12:09 pm
by slembcke
Are you trying to remove an object from the space in a collision handler callback without using a post step callback maybe? It sounds like the code snippet you posted isn't what's causing the crash. Can you compile as debug so you get a stack trace with line numbers? Otherwise it could be just about anything causing it.

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 4:29 pm
by qwertyp

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 4:44 pm
by slembcke
Ah, I see what is going on. You are attempting to free the space's children inside of a collision callback. Very very bad.

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 4:46 pm
by qwertyp
So how should I do it then? Could I just remove the whole space in the callback?

Re: Clear cpSpace

PostPosted: Thu Apr 15, 2010 5:47 pm
by slembcke
You need to set a flag or something signifying that you are done with the level. You can't free the space (or stuff it's processing) while the cpSpaceStep() function is still running. Post step callbacks were added to allow you to remove objects from the space after it is done processing all of the objects the space is referencing, but the space itself is still in use.

Re: Clear cpSpace

PostPosted: Fri Apr 16, 2010 6:57 pm
by qwertyp