Introducing Maya® 2008

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 con-

necting (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:

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Ways to Make NURBS

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NURBS Modeling: Creating the Red Rocket

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Editing NURBS Surfaces

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Using NURBS Surfacing to Create Polygons

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Converting NURBS to Polygons

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Patch Modeling: The Locomotive

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Using Artisan to Sculpt NURBS

CHAPTER 5

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