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OVRPlugin.GetFaceVisemesState returns Failure_Unsupported (AreVisemesValid always false) #132

Description

@Eric-yyyyy

Hi,

I am trying to use the VisemeDriver component from the Meta XR Movement SDK and Meta Quest Pro, but visemes never update. I have enabled the face and visual input in OVRCamerRig, and have enabled the viseme in OVRCameraRig, I also enabled the experimental features and “Record Audio for audio base Face Tracking”.

After debugging, I found that OVRPlugin.GetFaceVisemesState always returns Failure_Unsupported, which causes:

OVRFaceExpressions.AreVisemesValid = false

As a result, the VisemeDriver Update() method never runs.

Face expressions work correctly, but visemes are never available.

Relevant log output:

FaceTrackingEnabled = True
ValidExpressions = True
VisemeResult = Failure_Unsupported
AreVisemesValid = False

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