AutoCAD 2002 Bible

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7.    Repeat the RULESURF command. At the Select first defining curve: prompt, choose the top-left spline near its left endpoint. At the Select second defining curve: prompt, choose the bottom-left spline near its left endpoint.

8.    Save your drawing. It should look like Figure 23-35.

Figure 23-35: The completed drapes

Drawing Edge Surfaces

You can use the EDGESURF command to create unusual surfaces bound by four touching objects. The objects can be lines, arcs, splines, or polylines (2D or 3D). EDGESURF creates a polygon mesh that approximates a Coon’s surface patch mesh — a surface defined by four edges. Figure 23-36 shows an edge surface.

Use the SURFTAB1 and SURFTAB2 system variables to vary the displayed lines in each direction.

Follow these steps to create an edge surface:

1. Draw the four objects to create a boundary for the surface. They must touch, so use Endpoint object snaps to create them or to move them into place.

3. AutoCAD prompts you to select edges 1 through 4. You can select them in any order.

Creating the four edges involves moving from UCS to UCS because they are all in 3D. It helps to create a bounding box for your object using the AI_BOX command. You can then use the corners of the box to define your UCSs.

The drawing used in the following Step-by-Step exercise on drawing edge surfaces, ab23-g.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.

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