In Mission 2 of the Apocalypse Trigger, you begin with a 3D model of a simple wood platform for the mission bell and two polylines that were drawn on the XY plane.
Using 3D gizmos and tracking you reorient the polylines and begin creating the mission bell using powerful associative modeling tools in AutoCAD 2013.
After modeling the bell using 3D associative surfaces, you’ll insert a 3D block of the bell wheel. If you have some extra time, take a closer look at the bell wheel. It was created with a combination of 2D parametric constraints and 3D surfaces. That’s why the entire wheel model updates when you change a few values in the Parameters Manager.
To learn more about associative surfaces, parametric drawing, and materials, search for them in the AutoCAD 2013 Help page.