Bending curve is to use the so-called skeleton (skeleton) deformation state to control the entity, see the examples.
1) Construction of the physical characteristics shown in Figure 1 and curves, in which physical characteristics are the characteristics of bending, bending curve is used to control the shape of the skeleton. Figure 1
2) Select the menu "Insert"-> "high"-> "frame bending", as shown in Figure 2. Figure 23) in the menu manager selected by default, select the green plus light bending surface of the surface as a group, and select the sketch line as the bending control framework, as shown in Figure 3. Figure 34) set the bottom line point of the sketch as a starting point, and select the green plus light bending amount of the surface as defined in the plane, as shown in Figure 4. Figure 45) after the effect of bending as shown in Figure 5. Figure 5