Advanced collision pair functions

[sebastiend]

Hello chipmunkers,

I am looking for a way to remove shapes and their graphics when a collision occur. As I use Python, I could extend the Poly class to add a pointer to the other one linking graphics and physics. What do you think about this first solution, and what would I do if I decide to remake it in C?

[sebastiend]

I think I will make the top class check if the shape still exist and if it is not, destroy the graphics and itself. But it doesn't look a gracefull solution to me.

[slembcke]

You should make a list of all of the objects that you want to remove. In the collision pair function add the objects to this list. After the cpSpaceStep() call returns (or whatever it is in the python binding) then you can remove the shapes and bodies from the space. In the C API at least, removing objects during the collision callback is forbidden as it will likely cause nasty crashes. I don't know if the python binding has some sort of protection against this.

[sebastiend]

Thanks.