The SEDRIS Data Representation Model
APPENDIX A - Classes
Translucency

Class Name: Translucency

Superclass - <SEDRIS Abstract Base>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

Specifies the percentage of light that can pass through the given <Colour>, where

In essence, this specifies the transparency of the colour.

NOTE: An object's 'opacity' is equal to 1.0 - transparency.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

This class appears on only one page of the DRM class diagram.

Example

  1. The alpha value for an Ambient, OTW colour can be encoded in SEDRIS as a <Inline Colour> with an <Ambient Colour> and a <Translucency> component.

FAQs

If an object has a <Colour> with a <Translucency>, together with an <Image Mapping Function> specifying an <Image> that also has an alpha, how are the two alpha values resolved?

That depends on the <Image Mapping Function>'s image_mapping_method. See SE_Image_Mapping_Method for a detailed description of how <Image> and <Colour> alpha values are resolved for various mapping methods.

Constraints

None.

Composed of (two-way)

Component of (two-way)

Inherited Field Elements

This class has no inherited field elements.

Field Elements

SE_Long_Float translucency_value;
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Last updated: October 1, 2002 Copyright © 2002 SEDRIS™