Table 6

Table 6.138—DRM_Image_Library

Property

Description

Superclass

· <DRM Library>

Class

· <DRM Image Library>

Subclass

· none

Definition

An object of this DRM class defines a complete list of the unique <DRM Image>s that can be referenced within a SEDRIS transmittal.

Example(s)

· Imagery intended to be texture-mapped to other objects in the transmittal. For instance, consider an <DRM Image Library> containing an <DRM Image> of a tree, and a <DRM Model> of a tree, where the <DRM Model>'s geometry consists of a single <DRM Union Of Primitive Geometry> containing a single <DRM Polygon> and having <DRM Stamp Behaviour>. (In this example, <DRM Stamp Behaviour> allows the <DRM Polygon> to be rotated at run-time so that the texture-mapped side always faces the observer.)

Each <DRM Vertex> of the <DRM Polygon> in this example has a <DRM Texture Coordinate>, which is used, together with the <DRM Image Mapping Function>, to locate the imagery on the <DRM Polygon>.

· Imagery applied to a large number of polygons at once, where the <DRM Polygon>s are grouped under some <DRM Aggregate Geometry> with an <DRM Image Mapping Function>.

In this case, the <DRM Image Mapping Function> determines the placement of the imagery within the currently scoped 'world' spatial reference frame. The imagery is then applied to the <DRM Polygon>s after they have been located within the specified spatial reference frame.

This method has two common uses:

First, the application of a geo-specific image to many polygons in a seamless image.

Second, the application of a single image to a large number of polygons within a <DRM Model> (e.g. the image of an aircraft is "wall-papered" onto all the polygons within the <DRM Model> of that aircraft).

· Imagery can be transmitted that is not used by any <DRM Image Mapping Function>. This imagery normally has anchor pointspoints (see <DRM Image Anchor>).

Inherited field elements