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Chipmunk Physics • View topic - just started trying to learn, and now im stuck

just started trying to learn, and now im stuck

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just started trying to learn, and now im stuck

Postby nobody » Thu Jan 06, 2011 7:12 pm

nobody
 
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Re: just started trying to learn, and now im stuck

Postby slembcke » Thu Jan 06, 2011 7:21 pm

cpPolyShapeGetVert() gives you the vertexes relative to the body, the same vertexes that you gave to cpPolyShapeNew(). You can use cpBodyLocal2World() to convert them to absolute positions.
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Re: just started trying to learn, and now im stuck

Postby nobody » Thu Jan 06, 2011 11:21 pm

That worked perfectly. Thanks

So let me see if i understand how this works.
the vertexes given to cpPolyShapeNew are static but are offset by p in the body that it belongs to?

if thats true how is p set if I don't set it myself?
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Re: just started trying to learn, and now im stuck

Postby slembcke » Fri Jan 07, 2011 10:22 am

The rigid body structs hold information about where an object is, how fast it's moving and how much it weighs. Each time you call cpSpaceStep() Chipmunk updates the positions and velocities of all of the rigid bodies that have been added to it.

Rigid bodies don't have a shape and don't collide with things until you attach shapes to them, and the shapes are always defined relative to the position and rotation of the rigid body they are attached to. You can attach as many shapes as you want or none at all if you just need a body for attaching joints to.
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Re: just started trying to learn, and now im stuck

Postby nobody » Fri Jan 07, 2011 7:13 pm

OK thanks
I figured some of this stuff out messing around with it
last night

I really appreciate the help
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