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Interactive visualization is the key to insightful exploration. Animation can effectively convey a complex process or structure. Deriving a sequence of desired keyframes is a painstaking process entailing much trial and error. To help alleviate this problem, we developed AniViz-a tool for making visualization animations of time-varying, multivariate volume data. AniViz is an animation tool following two principles. First, it's desirable to directly turn the results of data exploration and visualization into animation content. Second, users can create a complex animation sequence by combining several simple effects. Such effects, and operators to combine them, are fine-tuned via an intuitive user interface.