9

1110 Chapter 9: Surface Modeling
Keyboard Entry rollout
The Keyboard E ntry rollout lets you create a
NURBS curve by typing. Use the
Ta b key to
move b etween the controls in this rollout. To click
a button from the keyboard, press
Enter while
the button is active.
X, Y, and Z—Let you enter the coordinates of the
next point to add.
Add Poi nt—Adds the point to the curve.
Clo se—Ends creation of the curve and creates
a segment between the last point and the initial
point to close the curve.
Fin is h —Ends creat ion of the curve, leaving it open.
Create Point Curve rollout
This rollout contains the controls for curve
approximation.
Interpolation group
Thecontrolsinthisgroupboxchangetheaccuracy
and typ e of curve approximation (page 1–1238)
used to generate and display the curve.
Draw In All Vi ewpor ts—Lets you use any viewpor t
whileyouaredrawingthecurve.Thisisoneway
to create a 3D curve. When off, you must finish
drawing the curve in the viewport where you
began it. Default=on.
WhileDrawInAllViewportsison,youcanalso
use snaps (page 2–41) in any viewport.
CV Cu rve
Create panel > Shapes button > NURBS Curves > CV
Curve button
Create menu > NURBS > CV Curve
CV curves are NURBS c ur ves (page 1–1106)
controlled by control vertices (CVs (page 3–926)).
TheCVsdon’tlieonthecurve. Theydefinea
control lattice (page 3–923) that encloses the curve.
Each CV has a weight that you c an adjust to change
the curve.
Whileyou’recreatingaCVcurveyoucanclick
to create more than one CV at the same location
(or close to it), increasing the influence of the
CVsinthatregionofthecurve. Creatingtwo
coincidentCVssharpensthecurvature.Creating
three coincident CVs creates an angular corner
in the curve. This technique can help you shape
the curve; however , if you later move the CVs
individually, you lose this effect. ( You can also
obtain the influence of multiple CVs by fusing
(page 3–946) CVs.)
ACVcurvecanbethebasisofafullNURBS model
(page 3–980).