Class

• <DRM Feature Volume Shell>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies 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).

The universal field specifies 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.

Class diagram

Figure 6.99 — DRM_Feature_Volume_Shell

Constraints

• Publishable Object
• Volume shell face consistency

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.