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Chipmunk Physics • View topic - Is the cpSimpleMotor constraint stable?
Page 2 of 3

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Thu Nov 19, 2009 9:35 am
by slembcke
I guess you could do that. There is nothing special about those fields.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Thu Nov 19, 2009 1:37 pm
by Tam Toucan
Correct a and b are the two bodies. No swapping, just a,b as passed in to the cpxxxxInit function.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Thu Nov 19, 2009 5:12 pm
by Dave
ok, cool. thanks for all the help guys.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sat Nov 21, 2009 6:48 pm
by Dave
Well, I've got the joint destruction management under control now. Keeping track of them through my struct isn't so bad after all. I have another question though, if you guys aren't tired of hearing from me yet j/k :p
Anyway, is it the case that if you don't add 2 shapes to the same group, whose bodies are attached with a joint, they will fight? I was hoping that I could just check my struct and see if they're in the same group, process the callback, then if they are, return 0, which will skip the collision. If this is incorrect, I'll go back to debugging, but I'm almost certain they are fighting in some sense.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sat Nov 21, 2009 9:21 pm
by slembcke
That is correct, connecting to bodies together with at joint is not enough to prevent collisions between their shapes. There are valid reasons why you would want shapes linked by a joint to collide, so you have to filter them out some other way.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sat Nov 21, 2009 9:25 pm
by Tam Toucan

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sat Nov 21, 2009 11:12 pm
by Dave
Well, what I'm really trying to do, is decide from the callback if two bodies should collide, even if they are connected by a joint. If I understand correctly though, this wont work because it affects the forces before the user callback is ever processed?

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sun Nov 22, 2009 1:23 pm
by Tam Toucan
I don't quite follow. The joints are always affecting the bodies. It doesn't mean they can't collide. What joint have you got and what are you trying to do?

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sun Nov 22, 2009 2:02 pm
by slembcke
The user callbacks are called before any of the collision response processing starts. That's why you are able to reject collisions using the callbacks. Does that clear things up?

Also, a slight warning is that by the time the collision callback is called, all of the collision detection work has already been done. If you are rejecting a lot of collisions from callbacks by running graph algorithms on the joint connectivity, you might find your performance is not so good. Usually processing the collision responses is far more expensive than the collision detection, so I wouldn't worry about it too much.

Re: Is the cpSimpleMotor constraint stable?

PostPosted: Sun Nov 22, 2009 3:58 pm
by Dave