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Step 3. Create the surfaces. The top surface is created first (Fig. 11). Since there are two curve elements in this surface, a purple surface quilt line will be created between them. While normal, this can be a nuisance when making modifications later on. A trick I picked up from Chris Fawcett’s presentation in Atlanta, “Smoothing out Surfaces,” is to make a Composite curve of the two curve elements in the side view body curves with the Approximate option. Then make the Boundary surface using the new composite curve and the 3D crest curve as the First direction curves, and the curve of the top rear edge of the hood from the front view body curve and the 3D front crest curve as the Second direction curves. The purple quilt line is gone, and the surface is more robust. Thanks, Chris!

Figure 11.

For the side surface, use the surface by Bounds again and select the long 3D composite curve and the long 2D curve from the top view for the First direction curves. The Second direction curves are the forward 3D crest curve and the 2D curve from the front view (Fig. 12)

Figure 12.

The front surface is also made by using the surface by Bounds technique. The front 3D crest curve and the top view front perimeter curve are selected as the First direction curves, and the 3D corner crest curve and the side centerline forward curve are selected as the Second direction (Fig. 13).

Figure 13.

Merge the surfaces together and you have the basic hood complete…Well, half of it anyway. (The curves have been layered off in Figs. 14a-b for clarity.)

Figure 14a (click to enlarge)		Figure 14b (click to enlarge)

After the surfaces have been merged, modify some of the body curves and make sure everything moves correctly.