Table 6.81 — DRM_Feature_Volume

Property

Description

Class

  • <DRM Feature Volume>

Superclass

Subclass

  • None.

Definition

An instance of this DRM class is a three-dimensional <DRM Feature Topology> instance used to represent the region of space that corresponds to parts of zero or more <DRM Volumetric Feature> instances, bounded by two or more <DRM Feature Face> instances.

The universal field specifies that the <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 conceptually 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 6.96 — DRM_Feature_Volume

Inherited field elements

Field name

Range

Field data type

None

   

Field elements

Field name

Range

Field data type

universal

 

Boolean

Default field values

Default field values for DRM_Feature_Volume

Associated to (one-way) (inherited)

  • None.

Associated to (one-way)

  • None.

Associated by (one-way) (inherited)

  • None.

Associated by (one-way)

Associated with (two-way) (inherited)

  • None.

Associated with (two-way)

Composed of (two-way) (inherited)

Composed of (two-way)

Composed of (two-way metadata) (inherited)

  • None.

Composed of (two-way metadata)

  • None.

Component of (two-way) (inherited)

Component of (two-way)

  • None.

Constraints

Clarifications

1The <DRM Feature Face> instances that border the <DRM Feature Volume> instance indicate the relationship by their association to the <DRM Feature Volume> instance. The converse of this relationship is that between <DRM Feature Volume Shell> instances and <DRM Feature Face> instances.

2If the <DRM Feature Volume> instance has an association relationship with a <DRM Feature Edge> instance, that <DRM Feature Edge> instance is contained within the <DRM Feature Volume> instance.

3If the <DRM Feature Volume> instance has an association relationship with a <DRM Feature Node> instance, that <DRM Feature Node> instance is contained within the <DRM Feature Volume> instance.

4The first <DRM Feature Volume Shell> instance associated with a <DRM Feature Volume> instance is its external shell, while the remaining, if any, are its internal shells. Exception: Since the universal <DRM Feature Volume> instance has no external boundary, all of its shells are internal shells.

Example(s)