sentences:  Ken Feldman, the art director, commented that the polygon count was not the only factor, and cited the increased texture detail as one of the reasons for Kratos's realistic appearance.The developers used a new technique called blended normal mapping to add realism to the basic model and hugely enhance the range of animation available (e.g., muscle movement, including visible veins, and facial animations).All of the main protagonists were animated by hand because the animators produced more effective work than basic motion capture, though the voice actors' facial movements were recorded by Image Metrics's performance capture system.