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The SEDRIS Data Representation Model
APPENDIX A - Classes Polyhedron |
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An instance of this DRM class is a <Volume Geometry> that encloses a bounded region of three-dimensional space, such as a building or a room within a building.
Consider a <Polyhedron> representing a building. It has a collection of component <Polygon>s, which defines its shape; an associated <Geometry Volume>, which defines its topological relationships; a <Classification Data> component that classifies it as an ECC_BUILDING; <Property Value> components that describe its characteristics, such as material composition, and a <Label> that identifies it as "The Empire State Building".
No. In order for <Polyhedron> instances to exist, the SRF must be three-dimensional, and at least four <Polygon> instances that enclose a region of space must exist.
A <Primitive Geometry> instance contains a <Union Of Primitive Geometry> instance as a component only when that <Primitive Geometry> instance can be decomposed into nested <Primitive Geometry> instances, as (for example) a <Polygon> instance can be decomposed into subfaces.
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