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I would like to model an AR asset, like a keyring with a few keys in it. Obviously, I would like to show that it could be picked up and then because of physics, keys will naturally show up to the bottom of the ring. How could I do that in ARKit / Reality Composor / USDZ or anyway that iOS allows?

[EDIT] Andy Fedoroff perfectly answered my question about whether ARKit / Reality Composor could model a keyring with a few keys question. Are there other tools (such as Unity or UnrealEngine or Houdini) that could be used to model this kind of relationship? Will USD / USDZ support this kind of model?

enter image description here

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2 Answers2

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Now there are no physics constraints (behaviours) in RealityKit 2.0 or in Reality Composer 1.5.

However, in SceneKit you can constrain two objects with SCNPhysicsBallSocketJoint.

class SCNPhysicsBallSocketJoint: SCNPhysicsBehavior

Test Chris Flannagan's project called iOS-Bimini-Ring-Toss to find out how it works.

enter image description here

Andy Jazz
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    Very cool. Thank you. Here is Chris Flannagan's article about this project: https://whoischris.com/build-3d-chainstringrope-scenekit-swift/ Is there a tool to create this kind of model? Will Unity or UnrealEngine do that? I wonder if USDZ is a more flexible framework that supporting this kind of model and it is just Apple tools do not support it yet. – BSharer App - Share Books Nov 28 '20 at 17:22
  • USD is Pixar's proprietary format. Unity and Unreal are capable to do this, but RealityKit is too young for now. Give it a try in 3 years, I think RK will be OK. – Andy Jazz Nov 28 '20 at 18:53
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There is a proposal "Rigid Body Physics in USD" that supposedly solve this issue.

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