The SEDRIS Data Representation Model
APPENDIX B - Constraints
Nested Primitive Geometry

Definition

When a <Primitive Geometry> instance contains a <Union Of Primitive Geometry> instance for nesting reasons, the resulting geometry shall be coplanar. Only <Polygon> instances, <Ellipse> instances, <Line> instances, <Arc> instances, and <Point> instances can have nesting, except for <Volume Object> instances with <Finite Element Mesh> (see below).

The possible combinations at any level of nesting are as follows.

CLASS PRIMITIVE GEOMETRIES THAT CAN BE NESTED
<Polygon> <Polygon>
<Ellipse>
<Line>
<Arc>
<Point>
<Finite Element Mesh>
<Ellipse> <Polygon>
<Ellipse>
<Line>
<Arc>
<Point>
<Finite Element Mesh>
<Line> <Line>
<Arc>
<Point>
<Arc> <Line>
<Arc>
<Point>
<Point> <Point>
<Volume Object> <Finite Element Mesh> as an interior 3-D mesh

<Finite Element Mesh> instances cannot nest.

Rationale

When a <Primitive Geometry> instance contains a <Union Of Primitive Geometry> instance for nesting reasons, the relationship means that the union represents a "subface" of the <Primitive Geometry> instance, i.e., it is part of the <Primitive Geometry> instance.

Example

No example supplied.

FAQs

No FAQs supplied.


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Last updated: July 26, 2006 Copyright © 2006 SEDRIS