ARKit body tracking (ARBodyAnchor) broken in iOS 18.0 + 18.1

Graphics & Games RealityKit
lenk OP
Created Oct ’24
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I'm wondering if anyone can suggest a workaround for the broken ARKit body tracking in iOS / iPadOS 18.0 and 18.1?

The orientation for foot bones (and possibly other bones) is incorrect in the ARBodyAnchor returned via ARView.session.delegate update method. It works correctly in iOS / iPadOS 17.x.

The same failure occurs in a SceneKit app via a ARBodyAnchor in ARSCNViewDelegate.

You can easily verify the problem using Apple’s own sample app: https://developer.apple.com/documentation/arkit/arkit_in_ios/content_anchors/capturing_body_motion_in_3d

Any help would be greatly appreciated.

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lenk OP
Oct ’24

Anyone, especially an Apple engineer, have any ideas on this problem? I submitted both a Feedback request (FB15465734 ) and a Code Level Support request almost a week ago and have not heard anything back on either one. We’d like to update our app ASAP but we don’t know how to work around this regression in ARKit.

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lenk OP
2w

The problem seems to be fixed in iOS 18.2 Beta (Build: 22C5109p).

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ARKit body tracking (ARBodyAnchor) broken in iOS 18.0 + 18.1
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