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I don't know what all these posters are talking about, VR simulates your elbow + arm position 100% with normal IK.

If you don't believe me just load up Echo VR and look at your arms. Valve probably just doesn't want them blocking your view.

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The same controller pose can correspond to different arm positions, so VR games/apps that do IK are making a guess that is generally going to be somewhat inaccurate. I do like the implementation in Lone Echo, though.

Whatever they're doing is pretty accurate. I've never noticed any issues.

Why is this being downvoted? Has no one in this thread played Echo VR?

Might be because you said "100%". I agree it's very accurate, accurate enough to be worth implementing even, but it certainly isn't 100% accurate.

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