Exercise for the Students:<Rotation Control Link>
We want the <Rotation> to vary between 0 and 180 degrees.
Add 3 <Expression> components to <Rotation Control Link> to accomplish this, along with any other required objects, and setting the fields of the <Rotation Control Link> accordingly.
Union of Geometry Hierarchy
Rotation Control Linkexpr_index = ?
Instance DRM Diagram, Sheets 16 - 17