ISO/IEC 18023-1:200x(E) — Table 6.96 DRM_Geometry_Model

Table 6.96 — DRM_Geometry_Model_Instance

Property

Description

Class

<DRM Geometry Model Instance>

Superclass

<DRM Geometry Hierarchy>

Subclass

None.

Definition

An instance of this DRM class specifies a single case of the existence of a <DRM Geometry Model> within a given transmittal, including variations or specialization unique to that case. In particular, a <DRM Geometry Model Instance> is used to transform a <DRM Geometry Model> into the SRF of another <DRM Geometry Model> or that of an <DRM Environment Root>.

Clarifications

¹ An association between a <DRM Feature Representation> instance and a <DRM Geometry Hierarchy> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship.

² An association between two <DRM Geometry Hierarchy> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship.

³ An association from a <DRM Geometry Model Instance> instance to a <DRM Geometry Model> indicates that the <DRM Geometry Model Instance> instances that particular <DRM Geometry Model>.

⁴ An association between a <DRM Feature Representation> instance and a <DRM Geometry Hierarchy> instance indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship.

⁵ An association between two <DRM Geometry Hierarchy> instances indicates that the environmental object(s) that they represent have the semantic relationship indicated by the <DRM Base Association Data> instance on the association relationship.

⁶ An association from a <DRM Hierarchy Summary Item> instance to a <DRM Geometry Hierarchy> indicates that the <DRM Hierarchy Summary Item> summarizes that <DRM Geometry Hierarchy>.

⁷ An association from a <DRM Reference Surface> instance to a <DRM Geometry Hierarchy> indicates that the <DRM Geometry Hierarchy> organizes the geometric objects that specify the resolution surface of the <DRM Reference Surface>.

⁸ This allows a <DRM Geometry Model Instance> to be conformal. If present, the <DRM Conformal Behaviour> component is applied after any <DRM Transformation> that is present.

⁹ This positions and orients the given <DRM Geometry Model Instance> in the target SRF.

Class diagram

Figure 6.112 — DRM_Geometry_Model_Instance

Inherited field elements

Field name	Range	Field data type
None

Field elements

Field name	Range	Field data type
None

Associated to (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each with a <DRM Base Association Data> link object¹
zero or more <DRM Geometry Hierarchy> instances, each with a <DRM Base Association Data> link object²

Associated to (one-way)

one <DRM Geometry Model> instance³

Associated by (one-way) (inherited)

zero or more <DRM Feature Representation> instances, each with a <DRM Base Association Data> link object⁴
zero or more <DRM Geometry Hierarchy> instances, each with a <DRM Base Association Data> link object⁵
zero or one <DRM Hierarchy Summary Item> instance⁶
zero or more <DRM Reference Surface> instances⁷

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

zero or one <DRM Classification Data> instance
zero or more {ordered} <DRM Property Set Index> instances
zero or more <DRM Property Table> instances
zero or more <DRM Property Table Reference> instances
zero or more <DRM Property Value> instances
zero or one <DRM Reference Surface> instance
zero or more <DRM Sound Instance> instances

Composed of (two-way)

zero or one <DRM Conformal Behaviour> instance⁸
zero or more <DRM Expression> instances, each with a <DRM Model Instance Template Index> link object
zero or one <DRM Overload Priority Index> instance
zero or one <DRM Rendering Priority Level> instance
zero or one <DRM Stamp Behaviour> instance
zero or one <DRM Transformation> instance⁹

Composed of (two-way metadata) (inherited)

zero or one <DRM Time Constraints Data> instance
zero or one <DRM Access> instance
zero or more <DRM Cross Reference> instances
zero or one <DRM Data Quality> instance
zero or one <DRM Description> instance

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

zero or more <DRM Alternate Hierarchy Related Geometry> instances, each with a <DRM Hierarchy Data> link object
zero or more <DRM Animation Related Geometry> instances
zero or more <DRM Classification Related Geometry> instances, each with a <DRM Classification Data> link object
zero or one <DRM Environment Root> instance
zero or one <DRM Geometry Model> instance
zero or more <DRM LOD Related Geometry> instances, each with a <DRM Base LOD Data> link object
zero or more <DRM Octant Related Geometry> instances, each with a <DRM Octant Data> link object
zero or more <DRM Perimeter Related Geometry> instances, each with a <DRM Perimeter Data> link object
zero or more <DRM Quadrant Related Geometry> instances, each with a <DRM Quadrant Data> link object
zero or more <DRM Separating Plane Relations> instances, each with a <DRM Separating Plane Data> link object
zero or more <DRM Spatial Index Related Geometry> instances, each with a <DRM Spatial Index Data> link object
zero or more <DRM State Related Geometry> instances, each with a <DRM State Data> link object
zero or more <DRM Time Related Geometry> instances, each with a <DRM Time Constraints Data> link object
zero or more <DRM Union Of Geometry Hierarchy> instances

Component of (two-way)

None.

Constraints

Example(s)

Consider a <DRM Model> of a building, consisting of a <DRM Geometry Model> describing its geometric representation, where the <DRM Model> is described in an LSR 3D SRF.
To instance this <DRM Model> into an <DRM Environment Root>, the SRF of which is 3D geodetic, the data provider constructs a <DRM Geometry Model Instance> with a <DRM World Transformation> component, and incorporates it into the <DRM Geometry Hierarchy> of that <DRM Environment Root>. The <DRM World Transformation> specifies the <DRM CD 3D Location> at which the <DRM Model>’s (0, 0, 0) coordinate will be instanced, together with any other transformation information required to orient and scale the <DRM Model> properly.
Consider a <DRM Geometry Model> describing the rotor of a helicopter, and intended for use within a larger <DRM Geometry Model> of the entire helicopter. Both are defined in 3D LSR SRFs.
The helicopter model will contain a <DRM Geometry Model Instance> of the rotor model, with an <DRM LSR Transformation> component containing a <DRM Rotation> instance with a <DRM Rotation Control Link>. The <DRM LSR Transformation> specifies both the transformation required to position the rotor within the helicopter model, and the <DRM Variable> within the larger helicopter <DRM Model> that will be plugged into the rotor <DRM Model>’s internal <DRM Variable> for angle of rotation.