- Author:
- Paul Duncan Macdougal
The generation of realistic imagery relies upon an adequate amount of visual detail in the image. A method of dynamically changing the amount of detail displayed as an object gets closer to the eyepoint is needed to maintain proper level of detail. One method is to establish a hierarchy of object descriptions which represent an object at various amounts of detail. This hierarchy can then be accessed to present the correct amounts of detail.
When an object is moving relative to the eyepoint, a method of changing between levels in the description hierarchy is needed. The transition can be done instantaneously, or over a certain distance or time range. This blending is done using transparency or pixel coverage.
A software system which manages object description hierarchies is described. This system includes a data generation system which creates object descriptions at various levels of complexity, object simplifiers which take a detailed object description and perform automatic simplification, an object editor which allows users to easily manipulate object descriptions, an object description verification program which checks for inconsistencies in an object description, the necessary control programs to decide when and how to change between levels in the hierarchy, and a display program which can blend two object descriptions into one image.
Finally, the results of using this system to create an animated sequence of a submarine docking maneuver are reported. A savings of approximately 70% in computation time is achieved through the proper management of detail.
Cited By
Bergman L, Fuchs H, Grant E and Spach S Image rendering by adaptive refinement Proceedings of the 13th annual conference on Computer graphics and interactive techniques, (29-37)- Bergman L, Fuchs H, Grant E and Spach S (1986). Image rendering by adaptive refinement, ACM SIGGRAPH Computer Graphics, 20:4, (29-37), Online publication date: 31-Aug-1986.
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