Making 3D face edges invisible in .NET

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Making 3D face edges invisible
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Making edges invisible makes a series of 3D faces look like one 3D face. Figure 23-4 shows three 3D faces with and without internal seams.
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Part IV Drawing in Three Dimensions
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All edges visible
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Figure 23-4: You can make internal edges of a 3D face invisible.
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You have several ways to control the visibility of 3D face edges.
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While you are drawing the 3D face, you can right-click and choose Invisible before each edge. Then specify the next point. However, it is sometimes difficult to predict exactly where to indicate the invisible edge. If the 3D faces are complex, it can even be difficult to predict where the edge will be.
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Using the EDGE command
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After creating the entire 3D face, you can use the EDGE command. The sole purpose of the EDGE command is to make 3D face edges visible and invisible this is probably the easiest way to control the visibility of 3D face edges. Choose Edge from the Surfaces toolbar. At the Specify edge of 3dface to toggle visibility or [Display]: prompt, select a visible edge that you want to make invisible. AutoCAD repeats the prompt so you can select additional edges. Press Enter to make the edges invisible. Although a visible edge might actually be two edges belonging to two adjacent 3D faces, EDGE makes them both invisible. To make invisible edges visible, right-click and choose the Display option. AutoCAD displays all the edges in dashed lines and shows the Enter selection method for display of hidden edges [Select/All] <All>: prompt. Press Enter to display all the edges or use the Select option to select 3D faces (you can use windows for selection). Either way, you see the edges of the 3D face you want to edit. AutoCAD then repeats the Specify edge of 3dface to toggle visibility or [Display]: prompt. You can now select the edge you want to make visible. Press Enter to end the command and make the edge visible.
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23 Creating 3D Surfaces
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Using the Properties window
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After creating one or more 3D faces, you can also choose Properties on the Standard toolbar and select one 3D face. (See Figure 23-5.) You can choose more than one, but the results are difficult to predict.
Figure 23-5: You can use the Properties window to change the visibility of 3D face edges.
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Using this window to edit 3D face edge visibility presents two difficulties. First, you have no easy way to know which edge is which. The dialog box only labels them Edge 1, 2, 3, and 4. Second, while the EDGE command makes both edges of adjacent 3D faces visible or invisible, the Properties window does not. You need to use it for each adjacent face. The best method is to use the EDGE command to control visibility of 3D face edges.
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On the CD-ROM
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The CD-ROM contains a routine that creates a 3D house based on your specifications. Look in \Software\Chap23\3dhouse3.
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Using the SPLFRAME system variable
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Setting the SPLFRAME system variable to 1 and then regenerating the drawing makes all 3D face edges visible. (The SPLFRAME system variable also affects the display of spline-fit polylines, hence its name.) To return edges to their original setting, set SPLFRAME to 0 and do a REGEN.
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Part IV Drawing in Three Dimensions
On the CD-ROM
The drawing used in the following Step-by-Step exercise on drawing 3D faces, ab23-a.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
Step-by-Step: Drawing 3D Faces
1. Open ab23-a.dwg from the CD-ROM. 2. Save it as ab23-1.dwg in your AutoCAD Bible folder. This is a blank drawing with architectural units. Turn on ORTHO. OSNAP should be on. Set running object snaps for endpoints and midpoints. If the Surfaces toolbar is not displayed, right-click any toolbar, and check Surfaces. 3. Choose 3D Face from the Surfaces toolbar. Follow the prompts:
Specify first point or [Invisible]: 6,6 Specify second point or [Invisible]: @20,0 Specify third point or [Invisible] <exit>: @0,2 Specify fourth point or [Invisible] <create three-sided face>: @-20,0 Specify third point or [Invisible] <exit>:
4. Start the COPY command. Follow the prompts:
Select objects: Select the 3D face. Select objects: Specify base point or displacement, or [Multiple]: click and choose Multiple. Specify base point: Pick any point. Specify second point of displacement or <use first displacement>: @0,0,1.5 Specify second point of displacement or <use first displacement>: @0,0,3 Specify second point of displacement or <use first displacement>: