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Chapter 12: Drawing and Editing 2D Splines and Shapes



                     FIGURE 12.16
                   The Selection rollout provides icons for entering the various subobject modes.
                       Spline subobject mode
                       Segment subobject mode

                       Vertex subobject mode






























                                Spline subobject mode
                              Segment subobject mode
                            Vertex subobject mode


                           The Selection rollout also has the Show Vertex Numbers option to display all the vertex numbers of a spline
                           or to show the numbers of only the selected vertices. This can be convenient for understanding how a
                           spline is put together and to help you find noncritical vertices. The Selected Only option displays the Vertex
                           Numbers only for the selected subobjects when enabled.
                   Note
                   The vertex order is critical in determining the direction in which cross sections are swept when using the Loft and
                   Sweep commands. You always can identify the first vertex in a spline because it is yellow. n
                           Figure 12.17 shows a simple star shape that was converted to an Editable Spline. The left image shows the
                           spline in Vertex subobject mode. All the vertices are marked with small plus signs, and the starting point is
                           marked with a small square. The middle image has the Show Vertex Numbers option enabled. For the right
                           image, the vertex numbers are shown after the Reverse button was used (in Spline subobject mode).

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           19_617779-ch12.indd   323                                                                     6/30/10   4:20 PM
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