Virtual actors living in a real world

This paper presents techniques and tools for creating and animating virtual actors in real scenes. Several problems are explained: real objects hidden by virtual actors and virtual actors hidden by real objects, collision detection between the virtual actor and the real environment correspondence between the real and the virtual cameras, casting shadows of the virtual actors on the real world. Case studies are presented like the virtual actress Marilyn walking with real people on a real street or sitting down on a real chair