Table 6.230—DRM_Reference_Vector_Control_Link

Property

Description

Superclass

·         <DRM Control Link>

Class

·         <DRM Reference Vector Control Link>

Subclass

·         none

Definition

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

The v0_expression_index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that controls the first component field of the <DRM Reference Vector>.

The v1_ expression _index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that controls the second component field of the <DRM Reference Vector>.

The v2_ expression _index field is a 1-based index into the ordered aggregation of <DRM Expression>s, and is used to select the specific <DRM Expression> that controls the third component field of the <DRM Reference Vector>.

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 three 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.

Inherited field elements

field_name

range

Field_Data_Type

description1

 

String

Field elements

field_name

range

Field_Data_Type

v0_expression_index2

 

Integer_Unsigned

v1_expression_index3

 

Integer_Unsigned

v2_expression_index4

 

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>s

Composed of (two-way)

·         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 or more <DRM Base Reference Vector>s

Constraints

·         none

Notes

1 A text description of what the <DRM Control Link> is for.

2 Index of the expression whose value controls the first component field of the affected <DRM Reference Vector>. If zero, this field is not controlled.

3 Index of the expression whose value controls the second component field of the affected <DRM Reference Vector>. If zero, this field is not controlled.

4 Index of the expression whose value controls the third component field of the affected <DRM Reference Vector>. If zero, this field is not controlled.

Class diagram

<DRM Reference Vector Control Link>