Class

• <DRM Image Library>

Superclass

• <DRM Library>

Subclass

• None.

Definition

An instance of this DRM class provides the complete list of unique <DRM Image> instances stored within the native transmittal of that <DRM Image Library> instance.

Class diagram

Figure 6.132 — DRM_Image_Library

Constraints

• Publishable Object

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.)

  

  Figure 6.133 — <DRM Image Library> example

  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> instances 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> instances after they have been located within the specified spatial reference frame.

  This method has two common uses.

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

  2. 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 points (see <DRM Image Anchor>).