1. An apparatus for rendering an avatar, comprising: one or more processors; and an avatar animation engine, to be operated by the one or more processors, to receive a plurality of facial motion parameters and a plurality of head gestures parameters, respectively associated with a face and a head of a user, and drive an avatar model with facial and skeleton animations to animate an avatar, employing at least a head bone and a torso bone connected at a joint and using the facial motion parameters and the head gestures parameters, to replicate a facial expression of the user on the avatar, that includes impact of head post rotation of the user; wherein the plurality of facial motion parameters depict facial action movements of the face, and the plurality of head gestures parameters depict head pose gestures of the head; wherein the avatar animation engine is to apply head rotation impact weights when driving the avatar model with facial and skeleton animations; and wherein the avatar animation engine is to apply head rotation impact weights from a head rotation impact weight map pre-generated employing the at least a head bone and a torso bone connected at a joint.
4. The apparatus of claim 1 , wherein the head rotation impact weight map has a layout that includes a section for the face, a section for eyeballs of the face, a section for a neck of the user, a section for a tongue of the face, a section for teeth of the face or a section for a body or clothing of the user.