Graphics Programs Reference
In-Depth Information
The CVSHOW command
The
CVSHOW
command (no alias) allows displaying the control points for selected
NURBS surfaces or splines. It just prompts for the selection:
Command: CVSHOW
Select NURBS surfaces or curves to display
control Vertices:
Selection
The CVHIDE command
The
CVHIDE
command (no alias) turns off the control point's visualization for all
NURBS surfaces and splines. It prompts nothing.
The CVADD command
The
CVADD
command (no alias) allows adding control points in the U or V direction,
or directly on the surface or spline. The command prompts for the selection of a
NURBS surface or spline:
Command:
CVADD
Select a NURBS surface or curve to add control
vertices:
Selection
By default, the specified point adds a row of control vertices in U direction and the
command ends. The
Direction
option allows changing to the other direction. The
in-
sert Knots
option allows inserting knots on the surface, instead of control vertices:
Adding control vertices in U direction
Select point on surface or [insert Knots/
Direction]:
Direction
Adding control vertices in V direction
Select point on surface or [insert Knots/
Direction]:
Point
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