With ray tracing, the skeletal rig can be rendered as a simple small-polygon figure or in a more complex human form. The rigs can then be wrapped in a textured "envelope" and rendered with lighting and shadows to make the scene look more realistic. The avatars are then infused with individual variables (behavioral algorithms for age, sex, mental health, and emotional state) that govern their movements and unique "personalities"--even though they all end up looking like agents from The Matrix.