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The SEDRIS Data Representation Model
APPENDIX A - Classes Attribute Set Table Library |
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An instance of this DRM class is a <Library> of <Attribute 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>, <Colour> pairs are repeated across a large number of <Polygon> instances as components.
Rather than creating many duplicate objects, the data provider creates an <Attribute Set Table Library>. Each of the <Image Mapping Function>, <Colour> pairs is placed in an <Attribute Set>, which is in turn stored in the primary <Attribute Set Table> of an <Attribute Set Table Group> within the library.
Each <Polygon> is then given an <Attribute Set Index> component, which is associated to the appropriate <Attribute Set Table Group>.
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