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Chipmunk Physics • View topic - Velocity limit horizontally and vertically

Velocity limit horizontally and vertically

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Velocity limit horizontally and vertically

Postby nixius » Sun Jun 12, 2011 4:43 am

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Re: Velocity limit horizontally and vertically

Postby mobilebros » Sun Jun 12, 2011 11:36 am

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Re: Velocity limit horizontally and vertically

Postby slembcke » Sun Jun 12, 2011 1:05 pm

Well, you can't do that because v_limit is a not a vector, but otherwise that is what you need to do. Override the velocity function and pull the x and y limits from your game object using the cpBody.data pointer. You can also just clamp the velocity outside of the cpSpaceStep() call. It's not 100% equivalent, but I don't think anybody will really notice the difference.

As for the overhead of doing that, I wouldn't worry about it. Your version probably runs slightly faster even as it doesn't involve a square root. That means that it will use 0.099% of the CPU instead of 0.1%. ;)
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Re: Velocity limit horizontally and vertically

Postby nixius » Mon Jun 13, 2011 3:56 pm

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Re: Velocity limit horizontally and vertically

Postby slembcke » Mon Jun 13, 2011 4:05 pm

You can get rid of the if(body->data) if you only set the velocity function on bodies that actually need it.
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Re: Velocity limit horizontally and vertically

Postby nixius » Tue Jun 14, 2011 3:07 pm

Good shout, thanks.
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Re: Velocity limit horizontally and vertically

Postby mobilebros » Fri Jun 17, 2011 8:18 am

Whoops! on the v_limit vector part :oops: Video looks good.
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