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Chipmunk Physics • View topic - Polygon shapes as static objects collision fails

Polygon shapes as static objects collision fails

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Polygon shapes as static objects collision fails

Postby wael » Sat Feb 20, 2010 8:57 am

Hi,

I have this problem with chipmunk:
It doesn't seem to take into account polygon shapes added to static objects. I have created a rectangle using cpPolyShapeNew, and added a circle object to my scene. The problem is that it doesn't seem to care at all about the rectangle. However when I add a static line shape, then in this case everything works and collision is detected.

The other issue with polygonal shapes is when adding a rectangle using cpPolyShapeNew to dynamic objects, in this case collision/physics is very badly handled and the rectangle penetrates the object with some modification to the angles, but it ends passing through!

All these simulation were done with (e=0; u = 0), (e = 1; u = 1), (e=0, u=1)

Is there something wrong, or is it simply that polygon shapes are not fully implemented ?

Regards
wael
 
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Re: Polygon shapes as static objects collision fails

Postby slembcke » Sat Feb 20, 2010 9:22 am

What version of chipmunk are you using? It sounds like you have a bad winding to me. Newer versions of chipmunk thow errors if you try to use a bad winding.
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Re: Polygon shapes as static objects collision fails

Postby wael » Sat Feb 20, 2010 1:45 pm

wael
 
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Re: Polygon shapes as static objects collision fails

Postby wael » Sun Feb 21, 2010 9:24 am

Finally got the problem solved. What I have been missing is indeed the winding. Seems like chipmunk consider the interior of a convex polygon completely solid, so it seems that I cannot place objects inside convex :(

Is there any way to do that (placing objects inside convex polygons) ?
If we have to limit to line segments, is the collision between segments handled when the segments are dynamic ?

Regards
wael
 
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Re: Polygon shapes as static objects collision fails

Postby slembcke » Sun Feb 21, 2010 11:10 am

The only limitation with segment shapes is that they don't yet collide with other segment shapes. If you want to make a hollow shape, it works fine to make it out of segments. If you need the outside to collide with other segments, you'll have to make a separate inside and outside shape and use layers or groups to let you put objects inside of it.
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