A global parameter is available to all scenes in a world. Users can use global parameters (such as viewer classes) to change the display of a world. Use global parameters if you think you might use the parameter in several scenes.
A global parameter is available to all scenes in a world and to the end user. You can set global parameters when you specify object properties or when you specify event actions. For example, after you publish your world and you deploy it in a Visual Basic application, the defined global parameters determine the initial level of detail and the viewer class.
Global parameters can be public or private. A public parameter can be modified by the end user in the Runtime Settings dialog box or via the container application.
QMF Visionary provides four built-in global parameters: ViewerX, ViewerY, ViewerZoom, and ViewerClass.