ISO/IEC 18023-1:200x(E) — Table 6.87 DRM_Feature_Volume

Table 6.87 — DRM_Feature_Volume_Shell

Property

Description

Class

<DRM Feature Volume Shell>

Superclass

<DRM SEDRIS Abstract Base>

Subclass

None.

Definition

An instance of this DRM class represents the one-directional topological relationship from a <DRM Feature Volume> to the collection of two or more <DRM Feature Face> instances that define one of its boundaries (external or internal).

Class diagram

Figure 6.100 — DRM_Feature_Volume_Shell

Inherited field elements

Field name	Range	Field data type
None

Field elements

Field name	Range	Field data type
universal ¹		Boolean

Associated to (one-way) (inherited)

None.

Associated to (one-way)

2 or more <DRM Feature Face> instances, each with a <DRM Face Direction> link object

Associated by (one-way) (inherited)

None.

Associated by (one-way)

None.

Associated with (two-way) (inherited)

None.

Associated with (two-way)

None.

Composed of (two-way) (inherited)

None.

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

None.

Component of (two-way)

one <DRM Feature Volume> instance

Constraints

Clarifications

¹ This indicates that the given <DRM Feature Volume> instance is the universal <DRM Feature Volume> instance. Within a 3D tile that has feature topology level 5, the universal <DRM Feature Volume> instance lies “outside” any other volumes. Since the external boundary of the universal <DRM Feature Volume> instance is at infinity, a <DRM Feature Volume> instance that has this field set to TRUE has no external <DRM Feature Volume Shell> instance.

Example(s)

Consider a <DRM Volumetric Feature> representing a building. It has an associated <DRM Feature Volume>, which defines its extent, shape, and topological relationships; a <DRM Classification Data> component that classifies it as an ECC_BUILDING; <DRM Property Value> components that describe its characteristics, such as material composition, and a <DRM Label> that identifies it as “The Empire State Building”. The external boundary of the <DRM Feature Volume> would consist of a single <DRM Feature Volume Shell>, which would be associated with the <DRM Feature Face> instances representing the walls, roof, and (basement) floor of the building.