PRG Mbox Designer Manual 3.9 - Manual (Page 148)

140 MBOX ® MEDIA SERVER USER MANUAL
ADVANCED CONTROL
The following section covers advanced Pixel Remapping features. If you are unsure about how to use these
features, contact PRG support for assistance.
Triangle Strips and Triangle Fans (3D Vertex Array Screen Objects)
In order to support non-rectangular shapes and/or to allow screen objects to be rotated in 3D space, standard screen
objects may be converted to Triangle Strip screen objects or Triangle Fan screen objects. Standard screen objects are
referenced by their origin and their width and height. Triangle strips and fans are referenced by their vertices.
To convert a screen object to a triangle strip or fan, select the screen object in the listbox on the main window. Then
click on the blue pop-up handle at the top-left of the window and select "Convert to Strip" or "Convert to Fan" from
the list.
CAUTION! Once you convert a screen object to a triangle strip or fan, you cannot undo the change.
Triangle strips are the simpler of the two triangle-based screen objects. The rectangular screen object is converted to
a screen object made from two triangles, as in the second illustration below. Four vertices are created, one for each
corner of the screen object. Texture coordinates for the vertices will also be created.
Note: The vertices are not ordered in a circular fashion around the perimeter the rectangle, but rather such that each
set of three consecutive vertices describes a closed triangle.
The two illustrations below show the coordinate data for the standard screen object and the triangle strip screen
object:
Standard Screen Object Triangle Strip Screen Object