Creating 3D Geometry - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 867

FiGuRE 16.43 The cabin after all the rectangular windows and frames
are finished
Adding the Pivot and Bi-Fold Doors
For this exercise, you will represent the two pivot doors with simple boxes and
the two bi-fold doors with extruded polylines. Later, if you choose, you can add
knobs and glass panes.
1. Set the A-DOOR-3DOB layer current, and thaw the A-DOOR-THRE-
3DOB layer.
2. Zoom into the back door. Rather than moving the primitives as you have
been doing, here you'll use Object Tracking to place the start point.
3. Switch to the 3D Wireframe visual style, turn on Object Snap
Tracking mode in the status bar, and make sure the Polar Tracking
and Intersection running object snaps are on as well.
4. Start the BOX command; and then, at the Specify first corner or
[Center]: prompt, place your cursor near the bottom-left outside cor-
ner of the front door where it meets the top of the threshold, until the
small cross in the intersection marker appears.