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Chipmunk Physics • View topic - joints question (newbie)

joints question (newbie)

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joints question (newbie)

Postby rolando » Tue Jun 16, 2009 3:23 pm

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Re: joints question (newbie)

Postby rolando » Tue Jun 16, 2009 3:43 pm

OK... I read the documentation again, and it turns out that pivot joints are *not* what I want... So I tried groove joints and they're working:



except for the fact that the black box still detaches from the brown box and is somehow going below the floor... :(
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Re: joints question (newbie)

Postby slembcke » Tue Jun 16, 2009 11:22 pm

A couple potential issues:
1: The center of gravity of your box shapes is at (0,0) which you are placing in one of the corners. Probably not what you meant.
2: You need to set your wheels and brown box shapes to the same collision group so that they don't generate collisions.
3: You probably did want pivot joints to attach the wheels, but your pivot point is most certainly not correct. The pivot is in world coordinates. (0,0) is pretty far from your chassis or any of your wheels.
4: Have you checked the winding? Try reversing the order of the vertices.
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Re: joints question (newbie)

Postby rolando » Wed Jun 17, 2009 9:59 am

Thanks for your reply!

3: If I specify the pivot point, then when moving the "car", do I have to update the joint?
4: What should be the winding? I read in the docs that it should be clockwise... is that correct? and what about the start point? can it be any point?

regards,
rolando./
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Re: joints question (newbie)

Postby rolando » Wed Jun 17, 2009 10:10 am

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Re: joints question (newbie)

Postby rolando » Wed Jun 17, 2009 10:24 am

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Re: joints question (newbie)

Postby slembcke » Wed Jun 17, 2009 2:30 pm

Doing the vector math on a Ruby array would be much slower and require a lot more work to rewrite all the vector operations to convert back from Ruby arrays, check size etc. It doesn't seem like a clear win/win situation.
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Re: joints question (newbie)

Postby rolando » Wed Jun 17, 2009 3:29 pm

I'm not saying to replace the vector math ruby ruby-arrays, just the conversion from the class Vec2 to just a plain ruby array. One should only need to modify rb_cpVect2.c... maybe I'll do it during the next days and make a comparison... benchmarks are far more useful than just works here :-)

cheers,
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