Graphics Programs Reference
In-Depth Information
NURBS surfaces
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.
Creating NURBS surfaces
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.
The SURFACEMODELINGMODE variable
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
The CONVTONURBS command (no alias) allows you to convert procedural surfaces
and solids to NURBS surfaces. It only prompts for objects selection:
Command: CONVTONURBS
Select objects to convert to: Selection
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