Class Name: Texture Coordinate Control Link

Superclass - <Control Link>

Subclasses

Definition

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

Primary Page in DRM Diagram:

• 17

Secondary Pages in DRM Diagram:

• 18

Example

1. Consider a <Polygon> instance P representing an exterior wall of a building, such that P has an <Image Mapping Function> component that applies a texture to P. Each <Vertex> component V_i of P has a <Texture Coordinate> component TC_i.

   Consider an explosion simulated near the building representation of which P is a part, such that there is a state change to the wall from undamged to showing damage from resulting from smoke. The data provider chooses to model this state change by changing the s, t values for each TC_i so that the texture applied to P changes from a portion of the referenced <Image> instance representing an undamaged wall to another portion of the same <Image> instance showing damage resulting from smoke.

   This is accomplished by supplying each TC_i with a <Texture Coordinate Control Link> component K_i. Each K_i has two <Expression> components, one of which determines the value for the s field value of TC_i while the other determines the value for the t field value of TC_i.

FAQs

No FAQs supplied.

Constraints

• <<Publishable Object>>
• <<Control Link Constraints>>

Composed of (two-way) (inherited)

• one or more {ordered} <Expression> instances

Component of (two-way)

• one or more <Texture Coordinate> instances

Inherited Field Elements

Field Elements

Notes

Fields Notes

description

The description field specifies a text description of the purpose of the <Control Link> instance.

s_expression_index

The s_expression_index field specifies which <Expression> component controls the s field value of the affected <Texture Coordinate> instance(s). If this value is zero, the s field values of those instances are not controlled; otherwise, the value is a one-based index into the ordered aggregation of <Expression> instances.

t_expression_index

The t_expression_index field specifies which <Expression> component controls the t field value of the affected <Texture Coordinate> instance(s). If this value is zero, the t field values of those instances are not controlled; otherwise, the value is a one-based index into the ordered aggregation of <Expression> instances.