246 AutoCAD and Its Applications—Advanced 246 AutoCAD and Its Applications—Advanced Bulge magnitude defi nes the size or “bulge” of the radial transition where the surfaces meet. See Figure 10-11. The default setting is 0.5. Valid values range from 0 to 1. A greater value is valid, but results in a larger roundness to the blend. Using different surface modeling techniques instead of entering a value greater than 1 is recommended. If the surface is set to G0 (positional continuity), changing the default bulge magnitude value has no effect. Using different continuity and bulge magnitude settings modifi es the surface and provides a way to create different blend surface shapes. You can change the continuity by using the grips that appear when creating the blend surface. Picking on a grip displays a menu with the continuity options. The same grips appear when selecting a blend surface after it has been created. You can also use the Properties palette to edit the settings of a blend surface. Blend surfaces can also be created between the edges of regions or solid objects. An example of creating a blend surface between two solid subobject edges to form a cap is shown in Figure 10-12. PROFESSIONAL TIP PROFESSIONAL TIP Continuity settings are retained when exporting a 3D model to other 3D CAD modeling applications. A B C Selected edges for second surface Selected edges for first surface A B C Figure 10-10. Blend surfaces created with different continuity settings. A—G0 continuity. B—G1 continuity. C—G2 continuity. Figure 10-11. Bulge magnitude determines the size of the radial transition at the edges where surfaces meet. A—The original model consists of two surfaces created from extruded arcs. B—The model after capping the ends with blend surfaces. For each surface, the continuity is set to G1 and the bulge magnitude is set to 0. C—For each surface, the continuity is set to G1. The bulge magnitude at the left edge is set to 0.5. The bulge magnitude at the right edge is set to 1.