Interactivity and Individual Viewpoint in Shared Virtual Worlds: The Big Screen vs. Networked Personal Displays Warren Robinett, Virtual Reality Games, Inc. Introduction B e i n g i n t e r a c t i v e means that when you do s o m e t h i n g , it changes what happens next. An interactive experience mimics the responsive nature of real-world e x p e r i e n c e - - n a m e l y , that your actions produce results. You can change the world (a little part of it at least) by reaching out and manipulating something. In a video game, the world that is changed by your actions is a virtual w o r l d - - a simulated world maintained in the memory of a computer. You act through an input device such as a joystick, and you see the results of your actions in the simulated world through the game's display screen. In contrast with video games, movies are not interactive because the sequence of events is fixed, and cannot be changed. No actions are permitted by the viewer. The viewer of
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