Part IV Drawing in Three Dimensions in .NET

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Part IV Drawing in Three Dimensions
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Figure 21-6: A line drawing using spherical coordinates
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You need to be careful when selecting objects for editing. For example, if you draw two identically sized rectangles at different Z coordinates, you see only one rectangle when you look at them from plan view. How do you know which rectangle you are selecting By changing the angle from which you view your drawing (fully covered in the next chapter), you can see all the parts of the drawing and can select objects easily.
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Multiple tiled viewports in which you view your drawing from different viewpoints can be very helpful in 3D drawing. For example, you can have a plan view in one viewport and a southeast view in another. Tiled viewports are covered in 8, Viewing Your Drawing.
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In the following exercise, you draw a simple wireframe piano bench and practice using 3D coordinates for both drawing and editing commands. You also view the drawing from two different angles.
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The drawing used in the following Step-by-Step exercise on using 3D coordinates, ab21-a.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Using 3D Coordinates
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1. Open ab21-a.dwg from the CD-ROM. 2. Save it as ab21-1.dwg in your AutoCAD Bible folder. 3. Choose Rectangle from the Draw toolbar. At the Specify first corner point or [Chamfer/Elevation/Fillet/Thickness/Width]: prompt, type 0,0,19 . At the Specify other corner point or [Dimensions]: prompt, type 39,15 . This creates a rectangle 39 units long by 15 units wide that is 19 units above the plane created by the X and Y axes. Notice that you omit the Z coordinate for the second corner.
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21 Specifying 3D Coordinates
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4. Start the COPY command. To copy the rectangle 2 units above the original rectangle, follow the prompts:
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Select objects: Pick the rectangle. Select objects: Specify base point or displacement, or [Multiple]: 0,0,2 Specify second point of displacement or <use first point as displacement>:
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You now have two rectangles, but because you are looking from the top, you see only one. 5. Choose SE Isometric view from the View flyout of the Standard toolbar. Now you can see the two rectangles, as shown in Figure 21-7.
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Figure 21-7: The two rectangles, shown from Southeast isometric view
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6. If OSNAP is not on, click it on the status bar. Set a running object snap for endpoints. 7. Start the LINE command. Follow the prompts:
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Specify Specify Specify Specify Specify first point: Pick the endpoint at 1 in Figure 21-7. next point or [Undo]: 0,0,0 next point or [Undo]: 1,0,0 next point or [Close/Undo]: 1,0,21 next point or [Close/Undo]:
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8. Start the COPY command. At the Select objects: prompt, select the three lines you just drew. End object selection. At the Specify base point or displacement, or [Multiple]: prompt, type 38,0,0 . At the Specify
Part IV Drawing in Three Dimensions
second point of displacement or <use first point as displacement>: prompt, press Enter. AutoCAD copies the three lines. Because the
bench is 39 units long and the legs are 1 unit wide, copying the leg 38 units in the X direction places the copy in the right location. 9. Do a Zoom Extents so you can see the entire drawing. 10. Repeat the COPY command. Use two separate crossing windows to select the first leg, then the second leg. AutoCAD should find three objects each time. End object selection. At the Specify base point or displacement, or [Multiple]: prompt, type 0,15,0 to copy the legs 15 units in the Y direction. Press Enter at the Specify second point of displacement or <use first point as displacement>: prompt. AutoCAD copies the legs to the back of the bench. 11. To draw an open cover for the piano bench, start the LINE command. Start it at the endpoint at 2 in Figure 21-7. At the Specify next point or [Undo]: prompt, type @15<90<45 . You know the length of the line because the cover is the same as the width of the piano bench. At the Specify next point or [Undo]: prompt, turn on ORTHO, move the cursor parallel to the length of the bench, and type 39. At the Specify next point or [Close/Undo]: prompt, use the Endpoint object snap to pick 3. End the LINE command. Zoom out and pan so you can see the entire bench. 12. To draw some bracing inside the bench, start the LINE command again. At the Specify first point: prompt, choose the endpoint at 4. At the Specify next point or [Undo]: prompt, type @15<90,2 . End the LINE command. Here, cylindrical coordinates are ideal because you don t know the length of the line but you know the change in the X and Z coordinates (the width and the height of the bench s body, respectively). 13. Save your drawing. It should look like Figure 21-8.