Unity, ARKit Blendshapes

[herbrush]

I am working with ARKit Blendshapes. There are 54 or so Blendshapes but when I request the index for a particular Blendshapes I get an error (GetBlendShapeIndex) on the following - mouthOpen, mouthSmile, eyesClosed, eyesLookUp, eyesLookDown.
In Your ARKit doc these are listed as “Additional” blend shapes. Not sure why? And some Blendshapes - I get an index but the avatar does not seem to do anything. Is there a document that covers this?

[Amel_RPM]

Hello,
Please refer to our guide that covers Blendshapes, morph targets and shape keys:

[GUIDE] Blendshapes, morph targets and shape keys

What are blendshapes / morph targets / shape keys Blendshapes, also known as morph targets or shape keys depending on the software used, are a technique used in computer graphics, particularly in 3D animation and modeling. They involve creating a series of predefined shapes or poses of a character’s mesh, which can then be smoothly transitioned between to create different facial expressions or deformations. ARKit & Oculus Visemes Ready Player Me avatars can be downloaded with blend shapes…