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The bulge factor value ranges from 0.0 to 2.0. If the bulge factor is not set by the user, it is set to the default value, 1.0. A larger value increases the fullness of the blend. A value of zero is usually suitable for a blend at a mixed convexity vertex, but for a uniform convexity vertex (i.e., all of whose edges are either convex or concave), a positive bulge factor may improve the shape obtained. Figure 1-9 illustrates a vertex blend with no bulge (blend is flatter) and then the same blend with bulge = 2.0, which produces a fuller blend. The default value of 1.0 should normally be acceptable.
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