3D Visualization and Solid Primitive Conceptual Design in AutoCAD

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3D Visualization and Solid Primitive Conceptual Modeling in AutoCAD®Named UCS options in the cascading menu. The PLAN command is discussed in more detaillater in the course.EXERCISE #31. Open the DICE.dwg file2. Experiment with isometricand orthographic preset views found in the 3DNavigatecontrol panel of the Dashboard.3. To make the dots on the dice white, go to the Options dialogbox, selectthe Displaytab, pick the Colors button, highlight“3D parallel projection” in the Context: pane,highlight “Uniform background” in the Interfacee element: pane, then pick “Black” fromthe Color: dropdown list. Pick the Apply & Close button to dismiss the DrawingWindow Colors dialog box, then pick OK to close the Options dialog box.Dynamically Changing a 3D ViewThe 3DORBIT command is a powerful and easy-to-use rotate the view of a 3D object in real time.command for creating pictorialviews of a 3D object.It allows you to dynamicallyThere aretwo basic modes for the 3DORBITcommand— —constrained and free. These arediscussed in the next sections.Constrained OrbitThis command isaccessed via the third button fromthe left in the top row of buttons in the3D Navigate control panel of theDashboard. See Figure3.A constrained orbit meansthat when you press andhold the pointer button, the view can be rotated up 90°,down 90° °, and horizontally 360°.You cannotdisplay an Figure 3. The Constrained Orbit Buttonupside-down view ofthe opposite side of themodel.Within these constraints, the model can be freely rotated. This is thedefault mode when thecommand is typed. When the command is initiated, the constrained orbit cursor is displayedd atthe pointer position.When in constrained orbit mode, a variety of optionsare available from the shortcut menu.In addition, you can select manyof these options using the 3D Navigate toolbar. These optionsare discussed in the following sections.8
3D Visualization and Solid Primitive Conceptual Modeling in AutoCAD®Professional TipThe constrained mode of the 3DORBIT command can be transparently accessed from withinanother command orwith no command active. Press and hold the [Shift] key andsimultaneously presss and hold the mouse wheel. Then, move the pointer to achieve a newviewpoint. If you undo the command within which 3DORBIT was accessed, the view is returnedto the previous display.Free OrbitThis command is also accessed via the third button from the left in the top row of buttons inthe 3D Navigate control panel ofthe Dashboard. This button is a flyout – you must hold thepickbutton down to allowother buttons to fly out.The second button is Free Orbit. See Figure 4.Without letting go of the pick button,move the cursor over theFree Orbit button, the let go of the pick button. This will activatethe command. (Free Orbit then becomes the default commandbutton for the third button in the top row.)Free orbit mode allows the same movement as inconstrained mode, but you can alsovertically rotate the viewFigure 4.The Free Orbit Button360°. When the command is initiated, a green circle is displayedin the middle of the current viewport. This is called the trackball, or arcball. By dragging inside oroutside of the trackball, the view of the object is dynamically changed. The cursor shapeindicateswhich action can be performed. Each shape isa visual cueto indicatewhich type ofaction will be performed if you pick, hold, anddrag (move the pointing device). As in theconstrained orbit mode, the shortcut menu shown of options is available.Basic 3D Orbit Display ControlsWithin the 3DORBIT command, you have the abilityto toggle between constrained orbit,free orbit, realtime pan, and realtime zoom by using the shortcut menu. Display the shortcutmenu by right-clicking and then pick Other Navigation Modes. Noticethat a check mark appearsnext to the current mode. Also notice the numbers next to each item. The mode can be switchedwithout displaying theshortcut menu by typing the number. See Figure 5.9
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