What are the blenshapes that the meta quest pro can use for the mouth

In the context of facial animation and expression, particularly for virtual reality headsets like the Meta Quest Pro, "blendShapes" are a way to define and animate facial expressions by blending different facial geometry states. Common blendShapes for mouth animation typically include:

**Mouth Open** - Wide-open mouth.
**Mouth Close** - Completely closed mouth.
**Smile** - Corners of the mouth pulled upwards.
**Frown** - Corners of the mouth pulled downwards.
**Mouth Pout** - Lips pushed outward.
**Mouth Left** - Mouth moves to the left side.
**Mouth Right** - Mouth moves to the right side.
**Lip Roll** - Movement of the lips up or down.
**Lip Stretch** - Stretching the lips horizontally.

These blend shapes are often used in combination to create more complex expressions and can be customized based on the specific needs of the application or character being animated. The Meta Quest Pro leverages advanced tracking capabilities, including facial expression tracking, to translate user expressions into the virtual environment effectively. 

For the most detailed and specific information, referring to the official Meta documentation or Unity's documentation on blendShapes would provide the most relevant insights for developers working with the Meta Quest Pro.