You need to create and assign Gesturing state animations only if you plan to use the GestureAt method. Gesturing state animations play when Microsoft Agent processes a call to the GestureAt method. If you define mouth overlays for your Gesturing state animations, the character can speak as it gestures.
The animation services determine the character's location and its relation to the location of the coordinates specified in the method, and play an appropriate animation. Gesturing direction is always with respect to the character; for example, GestureRight should be a gesture to the character's right.