The SEDRIS Data Representation Model
APPENDIX A - Classes
Separating Plane Related Geometry
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Class Name: Separating Plane Related Geometry
Subclasses
This DRM class is concrete and has no subclasses.
Definition
An instance of this DRM class specifies an aggregation of
<Geometry> instances, where the components
are organized based on their relationships with a set of
<Separating Plane> instances.
A component is either on the SE_TRUE
or SE_FALSE side of any
<Separating Plane> to
which the component is related.
Primary Page in DRM Diagram:
Secondary Pages in DRM Diagram:
This class appears on only one page of the DRM class diagram.
Example
Consider a <Geometry Model> of a
house, consisting of a <Geometry
Model Instance> of a chimney <Model>, and a
<Union Of Primitive Geometry>
containing the <Polygon> instances representing the
rest of the structure.
The <Geometry Model>'s geometry in this
case is organized as
<Separating Plane Related Geometry> containing one
<Separating Plane Relations>
instance, the <Separating Plane> of
which describes the plane of the portion of the
roof on which the chimney is placed. The
SE_TRUE branch of the
<Separating Plane Relations>
contains the chimney
<Geometry Model Instance>, while
the other branch contains the rest of the house Model's
geometry.
FAQs
No FAQs supplied.
Constraints
Associated by (one-way)(inherited)
Associated with (two-way)(inherited)
Composed of (two-way)(inherited)
Composed of (two-way)
Composed of (two-way metadata)(inherited)
Component of (two-way)(inherited)
Notes
Associated with Notes
An association between a <Geometry Hierarchy> instance and a
<Feature> instance indicates that the <Geometry Hierarchy>
and the <Feature> are alternate representations of the same
environmental object.
An association between two <Geometry Hierarchy> instances
indicates that they are alternate representations of the same
environmental object.
An association from a <Hierarchy Summary Item> instance to a
<Geometry Hierarchy> indicates that the <Hierarchy Summary Item>
summarizes that <Geometry Hierarchy>.
An association from a <Reference Surface> instance to a
<Geometry Hierarchy> indicates that the <Geometry Hierarchy>
organizes the geometric objects that specify the resolution
surface of the <Reference Surface>.
Composed of Notes
In the case where multiple <Collision Volume> components are
specified for a given <Aggregate Geometry>, the union of the
volumes thus specified is used in collision detection.
Fields Notes
If this value is SE_TRUE, each 'descendant' of this aggregation -
that is, each <Geometry> instance that exists in the component tree
rooted at the given <Aggregate Geometry> - shall be unique, in the
sense that it shall appear in only one 'branch' of this aggregation.
If unique_descendants is SE_FALSE, at least one <Geometry> instance
appears in more than one 'branch' of the aggregation.
If this value is SE_TRUE, each 'branch' of this aggregation
strictly complies with the organizing principle for its
particular subclass. If this value is SE_FALSE, at least
one 'branch' does not strictly comply with the given
organizing principle. See the organizing principle constraint
for each specific subclass for details.
Prev: Separating Plane Data.
Next: Separating Plane Relations.
Up:Index.
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Last updated: May 15, 2003
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Copyright © 2003 SEDRIS™
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