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Chipmunk Physics • View topic - Set body position

Set body position

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Set body position

Postby KUKA » Thu Aug 08, 2013 7:34 am

Hi, I have an old version of the engine( 5.3.2 ), because of my programming language no one else writes the header files
I have a few questions:
-How can I change the position of an object?
through body.p := cpv (x, y); fails
-How can I get the result of the collision of bodies?
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Re: Set body position

Postby slembcke » Thu Aug 08, 2013 8:27 am

That is how you set the position of a body. What fails about it?

Are you setting the position of the body every frame?
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Re: Set body position

Postby KUKA » Thu Aug 08, 2013 9:05 am

KUKA
 
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Re: Set body position

Postby slembcke » Thu Aug 08, 2013 11:09 am

Static means that it something move or change. So when you move the body, Chipmunk won't update any shapes attached to the static body unless you use one of the cpSpaceReindex*() functions to let it know that it needs to.

The better solution is to use a "rogue" body. Create a body, but don't add it to the space. Chipmunk will update it's shapes each frame like normal (they are separate objects), but it won't update the body's position or velocity automatically.

Also, if you set a body's position each frame, you should also set it's velocity to match. Otherwise you are going to end up with mushy, non-realistic collisions. If you want to do mouse control, you may also want to look at how the Chipmunk demo implements that using joints.
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Re: Set body position

Postby KUKA » Thu Aug 08, 2013 12:05 pm

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