ISO/IEC 18023-1:200x(E) — Table 6.213 DRM_Reference_Vector_Control

Table 6.213 — DRM_Reference_Vector_Control_Link

Property

Description

Class

<DRM Reference Vector Control Link>

Superclass

<DRM Control Link>

Subclass

None.

Definition

An instance of this DRM class is a specialized <DRM Control Link> used to provide the connection between an ordered aggregation of <DRM Expression> instances and the target fields of a <DRM Reference Vector>.

The expr_index_v0 field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that controls the unit_vector.vector[0] field of the <DRM Reference Vector>.

The expr_index_v1 field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that controls the unit_vector.vector[1] field of the <DRM Reference Vector>.

The expr_index_v2 field is a 1-based index into the ordered aggregation of <DRM Expression> instances, and is used to select the specific <DRM Expression> that controls the unit_vector.vector[2] field of the <DRM Reference Vector>.

Class diagram

Figure 6.257 — DRM_Reference_Vector_Control_Link

Inherited field elements

Field name	Range	Field data type
description ¹		String

Field elements

Field name	Range	Field data type
expr_index_v0 ²		Integer_Unsigned
expr_index_v1 ³		Integer_Unsigned
expr_index_v2 ⁴		Integer_Unsigned

Associated to (one-way) (inherited)

None.

Associated to (one-way)

None.

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)

one or more {ordered} <DRM Expression> instances

Composed of (two-way metadata) (inherited)

None.

Composed of (two-way metadata)

None.

Component of (two-way) (inherited)

None.

Component of (two-way)

one or more <DRM Reference Vector> instances

Constraints

Publishable Object

Clarifications

¹ This is a text description of the given <DRM Control Link> instance's purpose.

² This value specifies which <DRM Expression> component, if any, controls the unit_vector. vector field value of the affected <DRM Reference Vector> instances. If the value is zero, the unit_vector. vector field of those instances is not controlled.

³ This value specifies which <DRM Expression> component, if any, controls the unit_vector. vector field value of the affected <DRM Reference Vector> instances. If the value is zero, the unit_vector. vector field of those instances is not controlled.

⁴ This value specifies which <DRM Expression> component, if any, controls the unit_vector. vector field value of the affected <DRM Reference Vector> instances. If the value is zero, the unit_vector. vector field of those instances is not controlled.

Example(s)

For the <DRM Reference Vector> component of a <DRM Polygon> the <DRM Reference Vector> is its normal, so the <DRM Expression>s would compute the 3 fields of the normal of a <DRM Polygon>.
A <DRM Model> of a lighthouse has a <DRM Geometry Model> with a <DRM Union Of Geometry Hierarchy>, to which is attached a <DRM Spot Light> representing the lighthouse's light. The <DRM Spot Light> has a <DRM Lobe Data> describing the shape of the light code, in which a <DRM Reference Vector> specifies the light direction. The LIGHT_DIRECTION <DRM Reference Vector> has a <DRM Reference Vector Control Link> to change the direction vector of the light so that the lighthouse light sweeps over an area rather than holding stationary.