Michael F. Cohen, Li-wei He, and David Salesin
This paper presents a paradigm for automatically generating complete camera specifications for capturing events in virtual 3D environments. We demonstrate a fully implemented system, called the Virtual Cinematographer, as it is applied to the virtual "party" setting. The Virtual Cinematographer is implemented as a hierarchical finite state machine. Cinematographic expertise in the form of film idioms is encoded as a set of small finite state machines organized as a directed graph through call/return conventions and exception handling mechanisms. Each idiom is responsible for capturing a particular type of scene, such as three virtual actors conversing, or one actor moving across the environment. The idiom selects shot types and the timing of transitions between shots to best communicate events as they unfold. A set of camera modules, shared by the idioms, is responsible for the low-level geometric placement of specific cameras for each shot. The camera modules are also responsible for making subtle changes in the virtual actors' positions to best frame each shot. We discuss some basic heuristics of film making and show how these ideas are encoded in the Virtual Cinematographer.
Publisher Association for Computing Machinery, Inc.
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