An implementation of IPlayable that controls an animation layer mixer.
NOTE: You can use PlayableExtensions methods with AnimationLayerMixerPlayable objects.
| Null | Returns an invalid AnimationLayerMixerPlayable. |
| IsLayerAdditive | Returns true if the layer is additive, false otherwise. |
| SetLayerAdditive | Specifies whether a layer is additive or not. Additive layers blend with previous layers. |
| SetLayerMaskFromAvatarMask | Sets the mask for the current layer. |
| Create | Creates an AnimationLayerMixerPlayable in the PlayableGraph. |