8

1074 Glossary
Nor mal
The normal of each face can point in a different direction.
Anormalisavectorthatdefineswhichwayaface
or vertex is pointing. The direction of the normal
indicates the front, or outer surface of the face or
vertex.
You can manually flip or unify face normals to fix
surfaceerrorscausedbymodelingoperationsor
byimportingmeshesfromotherprograms.
See also
Normal modifier (page 1–738)
NTS C
NTSC (National Television Standards Committee)
is the name of the video standard used in North
America, most of Central and South America, and
Japan. The frame rate is 30 frames per second
(fps) or 60
fields (page 3–1032) per second, with
each field accounting f o r half the interleaved scan
lines on a television screen.
NUR B S
Fountain basin modeled as a NURBS surface
NURBS (Non-Uniform Rational B-Splines) are
a technique for interactively modeling 3D curves
and surfaces.
NUR B S Cur ve
Acurveobjectcreatedby NURBS modeling (page
3–1074)
. NURBS Curves can b e either Point
Curves or CV Curves. You can use them as you do
spline curves in Shape objects.
NUR B S M odel
Fountain modeled using N U RBS surfaces