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Chipmunk Physics • View topic - self.grab beginLocation moves all bodies off screen

self.grab beginLocation moves all bodies off screen

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self.grab beginLocation moves all bodies off screen

Postby QuantumDoja » Tue Jul 24, 2012 5:17 pm

Hi,

I've started to use: [self.grab beginLocation:], it works fine on iOS, but on the Mac, when I run it, it moves all of my bodies off of the screen, and there location is: nan, nan.

Has anyone else had a smilier problem?

Thanks

Chris
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Re: self.grab beginLocation moves all bodies off screen

Postby slembcke » Tue Jul 24, 2012 5:40 pm

Hmm. Are you grabbing static shapes maybe? By far the most common way to end up with NaNs is to allow infinite mass objects to collide or be jointed together.

The current version ChipmunkMultiGrab doesn't automatically filter those out for you. I usually recommend using one of the layer bits or a "static geometry" group as a quick simple filter.
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Re: self.grab beginLocation moves all bodies off screen

Postby QuantumDoja » Wed Jul 25, 2012 2:13 am

Thanks, I am specifying a layer in the grabber, it's just weird that it only happens on the mac version. It's the same code as the iOS version, just using the mac built chipmunk library...
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Re: self.grab beginLocation moves all bodies off screen

Postby QuantumDoja » Wed Jul 25, 2012 3:01 pm

Just a note, no, I'm not trying to grab a static body. I'll keep digging....
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Re: self.grab beginLocation moves all bodies off screen

Postby QuantumDoja » Thu Jul 26, 2012 4:29 pm

Ok, I'm getting closer.

I removed the libraries from the project and the headers. I then imported all of the code directly into my project so I could debug it and to my surprise I don't get any nan's anymore, and everything remains on screen, so I'm guessing the library that I built and included was misconfigured in someway. I'll keep digging.

Chris
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Re: self.grab beginLocation moves all bodies off screen

Postby slembcke » Sun Jul 29, 2012 12:53 pm

Any luck figuring this out yet? Need an extra pair of eyes to look at it?
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