Modeling with NURBS
As you saw in the previous chapter, NURBS are based on organic mathematics that allows you to create smooth curves and surfaces. NURBS models can be made of a single surface molded to fit or can be a collection of patches connected like a quilt. In any event, NURBS provide ample power for creating smooth surfaces for your models.
NURBS modeling depends on surfaces that are created using curves. Just as control vertices (CVs) are connected to form curved lines, NURBS surfaces are created by connecting (or spanning) curves. Therefore, typical NURBS modeling pipelines first involve the creation of curves that will define the edges, outline, paths, and/or boundaries of surfaces.
Once a surface is created, its shape is defined and governed by its isoparms. These surface curves—curves that reside solely on a surface—show the outline of a surface's shape much as the chicken wire in a wire mesh sculpture does. CVs on the isoparms define and govern the shape of these isoparms just as they would regular curves. So, in short, adjusting a NURBS surface involves manipulating the CVs of the object somewhat like sculpting.
Topics in this chapter include:
Ways to Make NURBS
NURBS Modeling: Creating the Red Rocket
Editing NURBS Surfaces
Using NURBS Surfacing to Create Polygons
Converting NURBS to Polygons
Patch Modeling: The Locomotive
Using Artisan to Sculpt NURBS
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