Using a geometry to set viewport direction

In Pro/e, you can rotate either the sphere or the window frame in the assemblly. But for either to be capable of rotational movement, they traditionally have to be attached to rotating datums, i.e., a datum constructed through an axis with an angular dimension to another datum. In WF, you pick the axis, hit the "Create datum plane" icon and an angular datum snaps in at 45 degrees which you can modify to anything you want. Then you use this datum for assembly of either the sphere or frame. Keep modifying the anular value to get the rotation.

The view manager, Orientation tab could be used for producing a saved view which places the window frame parallel to the screen and oriented vertically.

An alternative to locking everything to moveable datums is to assemble components with 'connections', a tab on the assembly interface if you have the Mechanism Design module.

Certain connection types allow rotational movement. Later, a motor can be added to power the rotation and create animations. Then you create an mpeg of the animation for independent playback. Besides the motion done with MDX, there's also animations done with Design Animation Extension, another addon module that shows up under 'Applications>Animation'. This lets you do keyframe sequences, then interpolates the movement between them to create something that combines mechanism dynamics and animated explode view. With it, you could 'fly by' the spinning earth and watch the earth pass from the left side of you viewport to the right as you fly out of view.

thanks very much for the info !