Tutorial Create a NURBS fiber
It is common in NURBS modeling to create a specific shape, called a profile, with a spline and then use it to generate a surface. In this exercise, you will extrude a NURBS surface, a tube, from a profile spline, along a guide spline (see Figure 05.23). This technique has implications for modeling tubular and fibrous structures—both of which are plentiful in biology. Tubular structures conduct fluid (lymph and blood, for example) and manage forces (long bones such as the femur and humerus). Likewise, fibers fill many roles in the tissues of living things: from axons that conduct nerve impulses to the rigorously aligned collagen bundles that compose tendons. The techniques you' ll explore in this tutorial will apply directly to a method for modeling a fiber matrix to simulate dense connective tissue in Part 3: Chapter 17.
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