8

CV Curve Sub-Object 1155
• Click-click. If you CTRL+click and then release
the mouse button, the height changes as you
drag the mouse. Clicking the mouse a second
time sets the CV’s location.
This method is less prone to repetitive stress
injury.
WhileyouareoffsettingtheCV,areddotted
line is drawn between the original CV on the
construction plane and the actual CV offset
from the plane. You can move the mouse into an
inact ive viewport, in which case the software sets
the height of the CV using the CV’s Z axis in the
inactive viewpor t. This lets you set the height of
the CV with accurac y.
Snaps (page 2–38) also work when you change the
height of a CV. For example, if you turn on CV
snapping, you can set a CV to have the same height
as another C V by snapping to that other CV in an
inactive viewport.
Procedure
To create a CV curve sub-object:
1.
Turn on CV Cur ve.
2. In a v iewport, click and drag to create the first
CV, as well as the
first curve segment. Release
the mouse button to add the second CV. Each
subsequent location you click adds a new CV to
the curve. Righ
t-click to end curve creation.
Note: If you beg
in the curve by clicking without
dragging, this also creates the curve’s first CV.
However, if you release the mouse button more
than five pixe
ls away from where you initially
pressed it, this creates an additional CV.
While you are creating a CV curve, you can
press BACKSPACE to remove the last CV you
created, and
then previous CVs in reverse order.
If Draw In All
Viewports is on, you can draw in
any viewp ort, creating a 3D curve.
ToliftaCVofftheconstructionplane,usethe
CTRL key as described earlier in t his topic
under "Drawing Three-Dimensional Curves."
As with splines, if you click over the curve’s
initial CV, a
Close Cur ve dialog (page 1–1230)
is displayed. This dialog asks whether you
want the curve to be closed. Click No to keep
the curve open or Yes to close the curve. (You
canalsocloseacurvewhenyouedititatthe
Curve sub-object level.) When a closed curve
isdisplayedattheCurvesub-objectlevel,the
initial CV is displayed as a green circle, and a
green tick mark indicates the curve’s direction.
Interf ace
CV Curve rollout (creation time)
Draw In Al l Vi ewports—Lets you u se any viewp ort
whileyouaredrawingthecurve.Thisisoneway
to create a 3D curve. When off, you must finish
drawing the curve in the view port where you
began it. Default=on.
WhileDrawInAllViewportsison,youcanalso
use
snaps (page 2–38) in any view p ort.
Automatic Re p aram eterization group
The controls in this group box let you specify
automatic reparameterization. They are simi lar to
the controls in the
Reparameterize dialog (page
1–1238)
, with one addition: all choices except
for None tell the software to reparameterize the
curve autom atically; that i s, whenever you edit it
by moving CVs, refining, and so on.