Creating Surface Sub-Objects

Surface sub-objects are either independent point and CV surfaces (like the top-level point and CV surfaces described in Point Surface and CV Surface), or they are dependent surfaces. Dependent surfaces are surface sub-objects whose geometry depends on other surfaces or curves in the NURBS model. When you change the geometry of the original, parent surface or curve, the dependent surface changes as well.

• Select a NURBS object. > Modify panel > Create Surfaces rollout
• Select a NURBS object. > (NURBS Creation Toolbox)
• Keyboard > +T to toggle NURBS toolbox display (Keyboard Shortcut Override Toggle must be on.)

You create surface sub-objects using the Create Surfaces rollout on the Modify panel for a NURBS surface, or using the NURBS toolbox.

Tip: Lathe and extrude surface sub-objects can be based on only a single curve. If you have dependent curves and want to use the set of curves (for example, two parents and a fillet between them) as the basis of an extrude or lathe surface, first go to the Curve sub-object level and use Join to connect the curves.

Creation operations for dependent sub-objects require that you select one or more parent objects. In general, you can click and drag, or click and then click again. You can also use the H keyboard shortcut to open a Pick Object version of the Selection Floater for choosing the parent. (The Keyboard Shortcut Override Toggle must be on for H to work this way.)

Toolbox Buttons for Creating Surfaces

These are the toolbox buttons for creating surface sub-objects:

Create an independent CV surface sub-object.

Create an independent point surface sub-object.

Create a dependent transform surface.

Create a dependent blend surface.

Create a dependent offset surface.

Create a dependent mirror surface.

Create a dependent extrude surface.

Create a dependent lathe surface.

Create a dependent ruled surface.

Create a dependent cap surface.

Create a dependent U loft surface.

Create a dependent UV loft surface.

Create a dependent 1-rail sweep surface.

Create a dependent 2-rail sweep surface.

Create a dependent multisided blend surface.

Create a dependent multicurve trimmed surface.

Create a dependent fillet surface.