Class Name: Reference Vector Control Link

Superclass - <Control Link>

Subclasses

Definition

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

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

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

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

Primary Page in DRM Diagram:

• 17

Secondary Pages in DRM Diagram:

• 5

Example

1. For the <Reference Vector> component of a <Polygon> the <Reference Vector> is its normal, so the <Expression>s would compute the 3 fields of the normal of a <Polygon>.

2. A <Model> of a lighthouse has a <Geometry Model> with a <Union Of Geometry Hierarchy>, to which is attached a <Spot Light> representing the lighthouse's light. The <Spot Light> has a <Lobe Data> describing the shape of the light code, in which a <Reference Vector> specifies the light direction. The SE_REF_VEC_TYP_LIGHT_DIRECTION <Reference Vector> has a <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.

FAQs

No FAQs supplied.

Constraints

Composed of (two-way)(inherited)

• one or more {ordered} <Expression> instances

Component of (two-way)

• one or more <Base Reference Vector> instances

Inherited Field Elements

Field Elements

Notes

Fields Notes

description

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

expr_index_v0

 This value specifies which <Expression> component, if any,
 controls the unit_vector.vector[0] field value of the
 affected <Reference Vector> instances. If the value is
 zero, the unit_vector.vector[0] field of those instances
 is not controlled.

expr_index_v1

 This value specifies which <Expression> component, if any,
 controls the unit_vector.vector[1] field value of the
 affected <Reference Vector> instances. If the value is
 zero, the unit_vector.vector[1] field of those instances
 is not controlled.

expr_index_v2

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