The SEDRIS Data Representation Model
APPENDIX A - Classes
Point

Class Name: Point

Superclass - <Primitive Geometry>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

An instance of this DRM class specifies an attributed location, which conceptually has no spatial extents.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. Consider a representation of the sun in a game set in the outer solar system. The data provider in this transmittal has chosen to represent the sun as a <Point> instance with a <Light Rendering Properties> component.

  2. Consider a <Model> instance J representing a jeep. J has a <Geometry Model> component, which in turn has a <LOD Related Geometry> component L with lod_data_type = SE_LODDATTYP_DISTANCE. The branch of L representing the jeep as viewed from a kilometre away represents a headlight as a <Point> instance having a <Light Rendering Properties> component.

FAQs

No FAQs supplied.

Constraints

Associated with (two-way)

Composed of (two-way) (inherited)

Composed of (two-way)

Composed of (two-way metadata) (inherited)

Component of (two-way) (inherited)

Inherited Field Elements

This class has no inherited field elements.

Notes

Associated with Notes


Geometry_Node

A <Geometry Node> instance associated with a <Point> instance represents the topology of that <Point> instance.

Composed of Notes


Union_Of_Primitive_Geometry

A <Primitive Geometry> instance P has a <Union Of Primitive Geometry> component only when P can be decomposed into nested <Primitive Geometry> instances.

EXAMPLE  A <Polygon> instance can be decomposed into multiple <Polygon> instances representing subfaces.


Prev: Perimeter Related Geometry Topology. Next: Point Feature. Up:Index.

Last updated: July 26, 2006 Copyright © 2006 SEDRIS