For face expressions, how do I get access to “expression.shout” and “teeth_shout” in Unity C# scripting?
I guess you talk about blend shape animations in your character?
Well first of all your model need to have blendshape animations. So that’s not something you can simply “use” since they need to be created outside of Unity in a modelling tool. If your model has blendshapes you can use the blendShapeCount and GetBlendShapeName of your mesh in order to find the index of a specific blendshape.
Once you have the index you can use SetBlendShapeWeight of your skinned mesh renderer in order to change the weight of a particular blendshape. That’s all.
Of course the names the blendshapes are arbitrary as they are created by the 3d artist / modelling tool.