9

Continuity 923
• Mapscontainerswithallmaptypesandmap
parameters.
• Single Map containers with a single map t ype
and its associated parameters.
• Object containers directly below a named
object item defining the creation parameters of
an unmodified object.
•ModifiedObjectcontainersholdingallofthe
modifiers applied to an object as well as the
creation parameters.
Con tinuity
A property of curves, including NURBS curves. A
curveiscontinuousifitisunbroken.
Con tinuity Level
Levels of curve continuity:
Left: C
0
, because of the angle at the top
Middle: C
1
, at the top a semicircle joins a semicircle of smaller
radius
Right: C
2
, the difference is subtle but the right side is n ot
semicircular and blends with the left
The level of continuity is a way to describe
cur v ature. A curve with an ang ular cusp is C
0
cont inuous. The curve is continuous but its
derivative is not. A curve whose curvature changes
has C
1
continuity. The curve and its derivative are
both continuous but its second derivative is not. A
curve with uninterr upted, unchanging curvature
has C
2
continuit y. NURBS curves must have at
least C
0
continuity; a continuity lev el greater
than C
2
is u nnecessary for most 3D computer
modeling.
Control Lattice
Control lattice surrounding the NURBS model of the fountain
basin
In NURBS modeling, the lattice described by
theCVsthatspecifyaCVCurveorCVSurface.
In viewports, this appears as a dotted yellow
framework when you edit the curve or surface at
the CV sub-object level. You can also choose to
display the control lattice in viewports at all times.
Con trol P oint
In Physique, a vertex used to control the cross
sections of envelopes, bulges, and tendons.