| 摘要 |
A method and system for rendering mixed media at a presentation workstation in response to a mixed media stream, in which the amount of computation is minimized. A tree structure includes nodes, each of which might point to sub-trees, and each of which designates a geometric object, a transformation to be applied to a geometric object, or a time-varying presentation. A scene includes nodes for each element in the scene. Depending from these would be nodes describing aspects of those elements, such as their texture and shape. A root node join the descriptions of each of the objects in the scene. Optimizing the amount of computation includes selecting nodes in the tree and calculating how to render each sub-tree. When possible, rendering information is calculated for only those portions of objects that will ultimately be shown to the user.
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