SET_VP_DIRECTION specifies the viewing direction of a
viewport.
---->(SET_VP_DIRECTION)----|viewport|----|direction|---->
This action has no options.
Use this action to change the viewing direction of a
viewport. The DIRECTION_3D menu is automatically
displayed, to help you define a new viewing direction.
The following parameter sequence resets the viewing direction
of the viewport.
SET_VP_DIRECTION "vport1" [specify direction]
All viewport names must be enclosed by double quotes (" ").
DYNAMIC_VP interrupt action