Table 6.187—DRM_Oct_Tree_Related_Geometry

Property

Description

Superclass

·         <DRM Aggregate Geometry>

Class

·         <DRM Oct Tree Related Geometry>

Subclass

·         none

Definition

An object of this DRM class specfies an aggregation of <DRM Geometry Hierarchy> in which each component <DRM Geometry Hierarchy> represents a branch of an oct_tree. The octant represented by a branch is specified by the <DRM Oct 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 Oct Tree Related Geometry>.

Example(s)

·         Consider an oct_tree that is represented in a transmittal by an < Oct Tree Related Geometry> instance. The lower left octant of the oct_tree is a < Union Of Primitive Geometry> aggregated by the < Oct Tree Related Geometry> as follows:

Oct Tree Related Geometry, Example 1

 

Inherited field elements

field_name

range

Field_Data_Type

unique_descendants1

 

Boolean

strict_organizing_principle2

 

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>

Associated with (two-way)

·         none

Composed of (two-way) (inherited)

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

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

·         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>s

·         zero or more {ordered} <DRM Colour>s

·         zero or one <DRM Conformal Behaviour>

·         zero or more <DRM Geometry Topology Hierarchy>s

·         zero or more <DRM Hierarchical Table>

·         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 one <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>

·         zero or one <DRM Stamp Behaviour>

Composed of (two-way)

·         a bounded set of 1..8 <DRM Geometry Hierarchy> through <DRM Oct Tree Data>

Composed of (two-way metadata) (inherited)

·         zero or one <DRM Access>

·         zero or more <DRM Browse Media>

·         zero or more <DRM Cross Reference>s

·         zero or one <DRM Data Quality>

·         zero or one <DRM Keywords>

·         zero or one <DRM Time Constraints Data>

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

·         Oct tree related organizing principle

·         Precedence of Attribute_Set_Index

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 Oct Tree Related Geometry>