Table 6.226—DRM_Quad_Tree_Related_Geometry

Property

Description

Superclass

· <DRM Aggregate Geometry>

Class

· <DRM Quad Tree Related Geometry>

Subclass

· none

Definition

An object of this DRM class specifies an aggregation of <DRM Geometry Hierarchy>s in which each component <DRM Geometry Hierarchy> represents a branch of a quad_tree. The quadrant represented by a branch is specified by the <DRM Quad Tree Data> associated with that branch. The bounding region that the <DRM Geometry Hierarchy> components occupy is defined by the <DRM Spatial Domain> of the <DRM Quad Tree Related Geometry>.

Example(s)

· Consider a region of terrain that is organized into quadrants, where the upper-right quadrant consists of ocean, and the other three quadrants consist of the terrain bordering the ocean. The ocean quadrant is not represented in the producer's system. The region is represented in SEDRIS by a <DRM Quad Tree Related Geometry> with 3 component <DRM Union Of Primitive Geometry>. (Since the remaining quadrant had no <DRM Polygon>s, it was not represented.)

· Consider a quad_tree that is represented in a transmittal by a <DRM Quad Tree Related Geometry> instance. The southwest quadrant of the quad_tree is a <DRM Union Of Primitive Geometry> aggregated by the <DRM Quad Tree Related Geometry> as follows:

Inherited field elements

field_name	range	Field_Data_Type
unique_descendants^1		Boolean
strict_organizing_principle^2		Boolean

Field elements

field_name	range	Field_Data_Type
none

Associated to (one-way) (inherited)

· none

Associated to (one-way)

· none

Associated by (one-way) (inherited)

· zero or one <DRM Hierarchy Summary Item>

· zero or more <DRM Reference Surface>s

Associated by (one-way)

· none

Associated with (two-way) (inherited)

· zero or more <DRM Feature>s

· zero or more <DRM Geometry Hierarchy>s

Associated with (two-way)

· none

Composed of (two-way) (inherited)

· zero or more {ordered} <DRM Attribute Set Indiex>s

· zero or more <DRM Base Level Of Detail Data>s

· zero or one <DRM Bounding Volume>

· zero or one <DRM Centre Of Buoyancy>

· zero or one <DRM Centre Of Mass>

· zero or one <DRM Centre Of Pressure>

· zero or one <DRM Classification Data>

· zero or more <DRM Collision Volume>

· zero or more <DRM Colour>s

· zero or one <DRM Conformal Behaviour>

· zero or more <DRM Geometry Topology Hierarchy>

· zero or more <DRM Hierarchical Table>s

· zero or more {ordered} <DRM Image Mapping Function>s

· zero or one <DRM Light Rendering Properties>

· zero or more <DRM Light Source>s

· zero or one <DRM LSR Transformation>

· zero or onen <DRM Overload Priority Index>

· zero or one <DRM Perimeter Data>

· zero or one <DRM Point Of Contact>

· zero or one <DRM Presentation Domain>

· zero or more <DRM Property Description>s

· zero or more <DRM Property Table>s

· zero or more <DRM Property Table Reference>s

· zero or more <DRM Property Value>s

· zero or one <DRM Reference Surface>

· zero or one <DRM Rendering Priority Level>

· zero or one <DRM Rendering Properties>

· zero or more <DRM Sound Instance>s

· zero or one <DRM Spatial Domain>

· ptionally, a <DRM Stamp Behaviour>

· zero or one <DRM Time Constraints Data>

Composed of (two-way)

· a bounded set of  1..4 <DRM Geometry Hierarchy>s through <DRM Quad Tree Data>

Composed of (two-way metadata) (inherited)

· zero or one <DRM Access>

· zero or more <DRM Browse Media>s

· zero or one <DRM Citation>

· zero or more <DRM Cross Reference>s

· zero or one <DRM Data Quality>

· zero or one <DRM Description>

· zero or one <DRM Keywords>

· zero or one <DRM Point Of Contact>

Composed of (two-way metadata)

· none

Component of (two-way) (inherited)

· zero or more <DRM Alternate Hierarchy Related Geometry>s through <DRM Hierarchy Data>s

· zero or more <DRM Animation Related Geometry>s

· zero or more <DRM Classification Related Geometry>s through <DRM Classification Data>s

· zero or one <DRM Environment Root>

· zero or one <DRM Geometry Model>

· zero or more <DRM Level Of Detail Related Geometry>s through <DRM Base Level Of Detail Data>s

· zero or more <DRM Oct Tree Related Geometry>s through <DRM Oct Tree Data>s

· zero or more <DRM Perimeter Related Geometry>s through <DRM Perimeter Data>s

· zero or more <DRM Quad Tree Related Geometry>s through <DRM Quad Tree Data>s

· zero or more <DRM Separating Plane Relations>s through <DRM Separating Plane Data>s

· zero or more <DRM Spatial Index Related Geometry>s through <DRM Spatial Index Data>s

· zero or more <DRM State Related Geometry>s through <DRM State Data>s

· zero or more <DRM Time Related Geometry>s through <DRM Time Constraints Data>s

· zero or more <DRM Union Of Geometry Hierarchy>s

Component of (two-way)

· none

Constraints

· Colour mapping restrictions

· Distinct link objects

· Image mapping functions and texture coordinates

· No attribute conflicts

· Non-crossing aggregations

· Non-crossing associations

· Non-cyclic aggregations

· Precedence of Attribute_Set_Index

· Quad tree related organizing principle

Notes

¹ If TRUE, for any object that exists 'below' this aggregation, each object will appear in only one 'branch' of this aggregation. If FALSE, objects may appear in multiple 'branches' of this aggregation.

² If TRUE, each 'branch' strictly follows the rules of this aggregation. If FALSE, each 'branch' might bend the rules a bit. For example, if this is a spatial aggregation, a value of TRUE indicates that objects will not cross the spatial extents defined by this aggregation relationship, and a value of FALSE indicates that objects might cross those bounds. For another example, if this is a time-based aggregation, a value of TRUE indicates that all branches will only contain data valid for the times specified for each branch, and a value of FALSE indicates that the branches have the option of including data that falls outside of the specified time ranges for that branch.

Class diagram

<DRM Quad Tree Related Geometry>