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The SEDRIS Data Representation Model
APPENDIX A - Classes Property Set Table Library |
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An instance of this DRM class is a <Library> instance of <Property Set Table Group> instances.
Consider a transmittal containing large stretches of various types of terrain, represented with texture-mapped <Polygon> instances, where the textures are blended with <Colour> instances. For efficiency, the source of this transmittal uses a library of terrain textures, which are repeated at intervals across the terrain. Consequently, a limited number of <Image Mapping Function> instance, <Colour> instance pairs are repeated across a large number of <Polygon> instances as components.
Rather than creating many duplicate DRM objects, the data provider creates a <Property Set Table Library> instance. Each of the <Image Mapping Function> instance, <Colour> instance pairs is placed in a <Property Set> instance, which is in turn stored in the primary <Property Set Table> component of a <Property Set Table Group> component within the library.
Each <Polygon> instance is then given a <Property Set Index> component, which is associated to the appropriate <Property Set Table Group> instance.
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