AutoCAD 2002 Bible

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Step-by-Step: Drawing Edge Surfaces


1. Open ab23-g.dwg from the CD-ROM.


2. Save it as ab23-7.dwg in your AutoCAD Bible folder. You see four curves in a bounding box, as shown in Figure 23-37. In this exercise, you use the curves to draw a dustpan.


3. Freeze the Const layer.




5. Choose View О Hide to see the result.


6. Save your drawing. It should look like Figure 23-38. It’s either a dustpan or a starship — your choice.

Figure 23-38: The completed dustpan — or starship

Summary


In this chapter, you learned all about 3D surfaces. AutoCAD offers many ways to create surfaces, including 3D faces, polyfaces, and 3D polygon meshes. AutoCAD provides routines to draw the basic geometric shapes: box, wedge, pyramid, cone, sphere, dome, dish, and torus.


You can also create complex surfaces by revolving a profile around an axis, extruding a curve, stretching a ruled surface between two curves, and creating an edge surface enclosed inside four curves.


In the next chapter, you learn how to create true solids (well, true electronic ones at least) as well as how to edit in 3D.


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Although you can create great-looking models with surfaces, if you want truly realistic models, you need to create solids. After all, in real life, objects have solidity. Even a thin object such as a wastepaper basket or a drape has some thickness. Solids enable you to create more realistic models than surfaces. You can also combine or subtract solids and get information about their physical properties. Figure 24-1 shows a complex model created using solids.

Скачать в pdf «AutoCAD 2002 Bible»