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I've not used openni_tracker, but what I can tell from reading the code is that you should be able to use the StampedTransform's childe_frame_id field to determine which user the transform is indicating.
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I've not used openni_tracker, but what I can tell from reading the code is that I think you should be able to use the StampedTransform's childe_frame_id child_frame_id field to determine which user the transform is indicating.
Though, I was also under the impression that tf frames were supposed to be uniquely named so it may be a shortcoming/bug of the openni_tracker node. This post may be related:
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