For instance, consider an Image Library containing an Image of a tree, and a Model of a tree, where the Model's geometry consists of a single Union of Primitive Geometry containing a single Polygon and having Stamp Behavior.
(In this example, Stamp Behavior allows the Polygon to be rotated at run-time so that the texture-mapped side always faces the observer.)
Each Vertex of the Polygon in this example has a Texture Coordinate, which is used, together with the Image Mapping Function, to locate the imagery on the Polygon.
In this case, the Image Mapping Function determines the placement of the imagery within the currently scoped 'world' spatial reference frame. The imagery is then applied to the Polygons 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 Model (e.g. the image of an aircraft is "wall-papered" onto all the polygons within the Model of that aircraft).