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42 Chapter 10: Precision and Drawing Aids
Curve E dge—
Snaps to the edge of a NURBS curve
(the current object moves or is created to lie along
the curve).
Curve End—Snaps to the end of a NURBS curve.
Sur f Center —Snaps to the center of a NURBS
surface.
The center of a NURBS cur ve is calculated
parametrically, and might not be the same as the
cur ve’s apparent visual center.
Sur f Normal—Snaps to a point on a NURBS surface
normal to previous point.
This snap operates only w hile you are creating a
new object.
Sur f Edge—Snaps to the edge of a NURBS surface.
Snap Override
Any viewport > Hold SHIFT and r ight-click. > Standard >
Choose snaps t ype.
Customize menu > Grid and Snap Settings > Snaps tab
Snap Override lets you supersede all the currently
selected snap types and temporarily use only one,
or none, of the snap t ypes currently selected on the
Grid and Snap Settings dialog. For example, you
mightbecreatingasplinewhilesnappingtogrid
points, but then need to snap one of its vertices to
the midpoint of an object.
Tip: You can choose the override by c ycling through
active snap types via a keyboard shortcut instead
of using the quad menu. Press ALT+S repeatedly
to choose the override snap ty pe. If the Grid and
Snap dia log is displayed, the "Override OFF" label
changes to display the selected snap type.
Procedures
To use Sna p Over r ide (k ey boar d s hor tcut method):
1.
Activate all the snap types you want to use or
override w ith.
2. Make sure the Grid And Snap Settings dialog
is open to the Snaps panel, so you can easily
track the override type. Alternatively, if you’re
using only snap types available on the
Snaps
toolbar (page 2–39)
,youcankeepthetoolbar
open instead.
3. While creating or moving an object with Snap
on, press ALT+S repeatedly.
The Grid And Snap Settings dialog > "Override
OFF" label changes to display the first available
override snap type, chosen from the active snap
t ypes. If the Snaps toolbar is open, and the
override snap type is available on the toolbar,
the override snap type is visible there as well.
4. Press ALT+S repeatedly.
The software cycles through all the active snap
typesfortheoverridetype.
The b enefit of this method is that it’s fast and
easy; you don’t have to use the quad m enu. But
if y ou want to override with a snap type that
isn’t currently active, it’s necessar y to use the
standard override method, which is described
in the next procedure.
TouseSnapOverride(standardmethod):
1.
While creating or moving an object with Snap
on, hold down SHI F T and right-click in a
view por t.
2. Select one of the snap types from the sub-menus
in the Snap Override quadrant to make it the
only active snap type.
If the Grid And Snap Settings dialog is open
to the Snaps panel, t he "Override OFF" label
changestodisplaytheactivesnapoverride
type. When you complete the mouse action,
"Override OFF" is again displayed in the dialog,