
Autodesk AutoCAD 2013 Practical 3D Drafting and Design
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NURBS surfaces are based on splines and are mainly used for free-form surfaces such as those used in the automotive industry. There are two processes for creating NURBS surfaces and several commands to edit them, which are presented next.
We can create NURBS surfaces by previously specifying a value 1
for the SURFACEMODELINGMODE
system variable and applying surface creation commands, or by converting existing objects with the CONVTONURBS
command.
When creating surfaces, the SURFACEMODELINGMODE
variable controls if NURBS or procedural surfaces are created:
0
: With this value, a procedural surface is created when creating surfaces.
1
: With this value, a NURBS surface is created when creating surfaces. It is applied to all surface creation commands, with the exception of PLANESURF
.
This variable is not saved and by default is set to 0
.
The CONVTONURBS
command (no alias) allows you to convert procedural...
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