AUTOCAD 2013 User Manual

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Many of the same commands used with NURBS surfaces, can also be used

with CV splines. These include:

■ CVADD

■ CVREMOVE

■ CVREBUILD

■ CVSHOW

■ CVHIDE

For more information, see Create Solids and Surfaces from Lines and Curves

(page 342).

Create Associative Surfaces

Surfaces can be associative while solids cannot. If surface associativity is on

when a surface is created, it maintains a relationship with the curve from

which it is was generated (even if the curve is the subobject of another solid

or surface). If the curve is reshaped, the surface profile automatically updates.

See Create Associative Surfaces (page 380).

NOTE To modify a surface that is associative, you must modify the generating

curve and not the surface itself. If you reshape the surface, its link to the generating

curve will be broken and the surface will lose associativity and become a generic

surface.

Deleting the Curves that Generate the Solid or Surface

The DELOBJ system variable controls whether the curves that generate an

object are automatically deleted after the solid or surface is created. However,

Create 3D Models | 345

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Autodesk AUTOCAD 2013 Autocad Architecture 2013