Part IV Drawing in Three Dimensions in .NET

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Part IV Drawing in Three Dimensions
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Using Tiled Viewports
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As you learned in 8, you can create multiple viewports to view your drawing at different zooms and pans. Tiled viewports are very helpful in 3D drawings as well. Although you can, and should, save UCSs and views, if you find yourself switching back and forth between two to four viewpoints, try creating two to four viewports with the different viewpoints and UCSs in them. The only disadvantage is that you have less screen real estate for each viewpoint.
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Defining a Perspective View
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AutoCAD s original command for defining views with perspective from any angle and distance was DVIEW. The new 3D orbit now outclasses DVIEW, but you may still find it helpful for its precise ways of defining a view. Like 3D orbit, DVIEW uses the metaphor of a camera. There is a camera point where you are standing and a target point what you are looking at. By defining these two points, you can create either close-up or distance views, much as you would with the zoom or panoramic lens of a camera. The DVIEW command creates both parallel and perspective views. Figure 22-34 shows a parallel view. Notice the side brackets. Figure 22-35 shows a perspective view of the same model. The side brackets appear to approach each other as they become more distant.
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Figure 22-34: A parallel view created with DVIEW
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Thanks to Robert Mack of the Dexter Company, Fairfield, Iowa, for this drawing, a base housing for an industrial washing machine.
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22 Viewing 3D Drawings
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Figure 22-35: A perspective view of the same model
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Using DVIEW
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To create a perspective view, type dview on the command line. At the Select objects or <use DVIEWBLOCK>: prompt, select the objects you want to include in the process of defining the perspective view. You should select as few objects as you need to visualize the final result if you have a complex drawing. If you want to select the entire drawing, type all even if the current view doesn t display the entire drawing. Press Enter if you don t want to choose any objects. AutoCAD substitutes a block called dviewblock, which is a simple house. You can use the house to set your perspective view.
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If you wish, you can create your own block and name it dviewblock. Create it with X, Y, and Z dimensions of 1. When you press Enter at the Select objects or <use DVIEWBLOCK>: prompt, AutoCAD looks for dviewblock and uses it to display the results of the perspective view settings.
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Understanding the DVIEW options
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Once you select objects or press Enter, you see the following prompt:
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Enter option [CAmera/TArget/Distance/POints/PAn/Zoom/TWist/CLip/Hide/Off/Und o]:
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You use these options to define the perspective view, as explained in the following sections.
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Part IV Drawing in Three Dimensions
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Use the Camera option to specify the angle of the camera, which represents where you are standing. You need to specify the angle from the X axis in the XY plane and the angle from the XY plane. This is very similar to the way you specify a view using the DDVPOINT command, explained earlier in this chapter. When you choose this option, by right-clicking and choosing Camera, you see the following prompt:
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Specify camera location, or enter angle from XY plane, or [Toggle (angle in)] <35.2644>:
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The default angle is based on the current view when you start DVIEW. If you know the angle from the XY plane, you can just type it in. You can also move the cursor vertically to dynamically see the results. The view constantly changes as you move the cursor, moving up over your objects as you move the cursor up, and down as you move the cursor down. Move the cursor in one direction and then keep it still for a second to see the full effect. However, moving the cursor horizontally changes the angle from the X axis in the XY plane. It can be confusing to change both angles at once so AutoCAD enables you to limit the effect of your cursor movement to one angle. You do this with the Toggle suboption. Right-click and choose Toggle (angle in) to see the next prompt of the Camera option:
Specify camera location, or enter angle in XY plane from X axis, or [Toggle (angle from)] <66.12857>:
Now, your cursor affects only the angle from the X axis. Move the cursor horizontally to see your objects rotate around you at a constant altitude. Press Enter when you like what you see, or you can type in an angle.
If you want to set the angle in the XY plane first and limit the effect of cursor movement to that change, you need to use the Toggle suboption to get to the Enter angle in XY plane from X axis: prompt. Once you set the angle in the XY plane, the suboption ends. Start the Camera option again to set the angle from the XY plane.