Part IV Drawing in Three Dimensions in .NET

Implement Universal Product Code version A in .NET Part IV Drawing in Three Dimensions
Part IV Drawing in Three Dimensions
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Figure 23-28: The revolved surface
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Drawing an Extruded Surface
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To extrude means to thrust out. In AutoCAD, it refers to creating a 3D object from a 2D object. The TABSURF command takes an outline, or profile, which AutoCAD calls a path curve, and extrudes it along a vector that defines the direction and distance of the extrusion. TABSURF creates a 3D polyline mesh. The type of surface created is called a tabulated surface. Figure 23-29 shows two examples of extruded surfaces.
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Figure 23-29: Two extruded surfaces created using TABSURF
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For the I-beam, you could have simply given the 2D polyline profile a thickness and achieved a similar result. However, the extruded surface on the left could only have been created with TABSURF because the extrusion is not perpendicular to the XY plane that contains the 2D polyline profile. TABSURF can extrude a shape in any direction.
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23 Creating 3D Surfaces
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When you select the vector object, your pick point determines the direction of the extrusion. AutoCAD starts the extrusion from the end of the vector closest to the pick point. You use SURFTAB1 to control the number of lines AutoCAD uses to display the curve. If the curve is made up of polyline segments, AutoCAD displays one line at each segment vertex.
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Note the I-beam in Figure 23-29. If you create an object by mirroring, stretching, and so on, you will see extra tabulation lines at the separate segments in the polyline definition. If you want a clean look, you need to draw clean. You might need to use the original shape as a guide to draw a new polyline on top of the old one, and then erase the original.
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You should use a nonplanar view when using TABSURF to check that you have accurately defined the extrusion vector into the third dimension. Any of the preset isometric views will be helpful. To draw an extruded surface, follow these steps: 1. Draw the object to extrude a line, arc, circle, polyline, ellipse, or elliptical arc. This is the path curve. 2. Draw the vector, usually a line. If you use a 2D or 3D polyline, AutoCAD uses an imaginary line from the start point to the endpoint to determine the vector. 3. Choose Tabulated Surface from the Surfaces toolbar.
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4. At the Select object for path curve: prompt, select the path curve object. 5. At the Select object for direction vector: prompt, select the line you are using for the vector.
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The drawing used in the following Step-by-Step exercise on drawing tabulated surfaces, ab23-e.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Drawing Tabulated Surfaces
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1. Open ab23-e.dwg from the CD-ROM. 2. Save it as ab23-5.dwg in your AutoCAD Bible folder. You see a tabletop drawn at a Z height of 30. The current elevation is 30. You are looking at the table from the SE isometric view. OSNAP should be on. Set running object snaps for endpoint, midpoint, and center. The current layer is Const. The drawing is shown in Figure 23-30.
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Part IV Drawing in Three Dimensions
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3. Start the CIRCLE command. Follow the prompts:
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Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: Choose the From object snap. _from Base point: Pick the endpoint at 1 in Figure 23-30. <Offset>: @-1,3 Specify radius of circle or [Diameter]: .75
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Figure 23-30: The tabletop
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4. Start the LINE command. At the Specify first point: prompt, choose the Center object snap of the circle you just drew. At the Specify next point or [Undo]: prompt, type @3,-3,-30 to draw a line flaring out from the circle and going down to the floor. End the LINE command. 5. Choose Tabulated Surface from the Surfaces toolbar. At the Select object for path curve: prompt, select the circle. At the Select object for direction vector: prompt, select the line. (You can see only the top part of the line, but that s the part you need to pick.) AutoCAD creates the tabulated surface.
6. Start the MIRROR command. Select the entire leg. Choose the midpoint of the bottom edge of both long sides of the table for the two points of the mirror line. 7. Repeat the MIRROR line and select both legs. Mirror them using the midpoints of the bottom edge of the short sides of the table for the two points of the mirror line. 8. Do a ZOOM Extents to see the entire table. 9. Save your drawing. It should look like Figure 23-31.