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How can I create a concave SKPhysicsBody?

My guess is to create a composite node that consists of multiple convex bodies. Can I "stick" them any other way that create an SKPhysicsJointFixed between each?

Connor Pearson
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Geri Borbás
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2 Answers2

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You may want to wait a short while - I can't say it explicitly, but there's an intriguing new SKPhysicsBody method if you look at pre-release docs at developer.apple.com and search for "iOS 7.1 API Diffs".

There is another way - you can simply create new SKNodes, add your new nodes as the children of your target composite node, and attach convex SKPhysicsBodies to these child nodes.
EDIT: this will only work for non-dynamic constituent bodies, if you just want to detect contact/collision on a concave composite one that's static.

Geri Borbás
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Batalia
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  • It was my guess too, but would them "stick" this way? Probaly still remains the need for joint. – Geri Borbás Feb 19 '14 at 16:26
  • You're correct - it only worked for me because my child bodies were non-dynamic (I was just testing for contact on a static concave body). Dynamic bodies will indeed fall apart. Can you please post your code where your fixed joint "tears"? – Batalia Feb 19 '14 at 16:54
  • Wow, really, `+[SKPhysicsBody bodyWithBodies:]` seems promising to me. – Geri Borbás Feb 21 '14 at 11:32
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Create two or more SKPhysicsBody variables using convex paths, then create a union of these paths using the initializer SKPhysicsBody.bodyWithBodies. This union can be concave.

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Craig Grummitt
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