... out, 179 –181symmetric models, 170 – 172 temporary placeholder components, 179 ungrouping, 37 versus objects, 153windows in 3D walls, 172 – 178 known thickness, 177 – 178 unknown thickness, 173 – 176 (see ... path, 27 presentation, 271 –296animated sectioning, 2 87 291staged, 292–296animation, 274 layers, 271 – 272 default layer, 272 scenarios, using layers, scenes, and groups, 280–282scenes, 273 – 274 saving, ... 273 – 274 saving, 273 Section Plane tool, 276 – 277 , 2 87 291Active Cut, 289Active Section Planes, 289Camera Location, 289Shadow Settings window, 275 toggling display of objects, 277 – 279 walking through...