About-Creating-NURBS-Surfaces

About Creating NURBS Surfaces

    About Creating NURBS Surfaces

    Create NURBS surfaces when you need a freeform way to sculpt a surface shape.

    Create NURBS surfaces by enabling NURBS creation and using many of the same commands
    used to create procedural surfaces. You can also convert existing procedural surfaces
    into NURBS surfaces.

    NURBS surfaces are based on Bezier curves or splines. Therefore, settings such as
    degree, fit points, control vertices, weights, and knot parameterization are important
    in defining a NURBS surface or curve. Splines are optimized to create NURBS surfaces,
    allowing you to control many of these options. The illustration below shows the control
    vertices that are displayed when you select a NURBS surface or spline.

    Two Methods for Creating NURBS Surfaces

    There are two ways to create NURBS surfaces:

    • SURFACEMODELINGMODE system variable. Use any of the surface creation commands while this system variable is set to 1.
    • CONVTONURBS command. Convert any existing procedural surfaces to NURBS surfaces with this command.

    It is important to plan ahead with NURBS modeling, since NURBS surfaces cannot be
    converted back into procedural surfaces.

    Learning AutoCad

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