9

878 Chapter 8: Modifiers
Tw ist Parameters rollout
Twist group
Angle—Determines the amount of twist around
the vertical axis. D efault=0.0.
Bias—Causes the twist rotation to bunch up at
either end of the object. When the par ameter is
negative , the object twists closer to the gizmo
center. When the value is positive, the object twists
more away from the gizmo center. When the
parameter is 0, the twisting is uniform. Range=100
to -100. Default=0.0.
Twist Axis group
X/Y /Z—Specify the axis along which the twist will
occur. This is the local axis of the Twist gizmo.
Default=Z.
Limits group
Applies the twist effect only to vertices that lie
between the lower and upper limits. The two
spinners represent distance a long the gizmo’s Z
axis (Z=0 is at the gizmo’s center). When they are
equal, it is the same as disabling the twist effect.
Limit Effect—ApplieslimitconstraintstotheTwist
modifier.
Upper Limit—Sets the upper limit for t he twist
effect. D efault=0.
Lower Limit—Sets the lower limit for the twist
effect. D efault=0.
Unwra p UV W Modi fier
Select an object. > Modify panel > Modifier List >
Object-Space Modifiers > Unwrap UVW
Select an object. > Modifiers menu > UV Coordinates >
Unwrap UVW
The Unwr ap UVW modifier is used to assign
planar maps to sub-object selections, and to edit
the UVW coordinate s of those selections. Existing
UVW coordinates on an object can b e unwrapped
andeditedaswell.Mapscanbeadjustedtothe
proper fit on a M esh, Patch, Polygon, HSDS, or
NURBS model.
The Unwrap UVW modifier can be used as
a self-contained UVW mapper and UVW
coordinate editor, or in conjunction with the
UVW Map modifier (page 1–922).Ifyouuse
Unwrap UVW in conjunction with the UVW
Map modifier, it is usual ly so you can use a
mapping method unavailable in Unwrap UVW,
such as Shrink Wrap. You can animate UVW
coordinates by turning on the Auto Key button and
transforming the coordinates at different f rames.
Note: After applying the Unwrap UVW modifier,
open mapping edges, or seams, appear on the
modified object in the view ports. This helps you
visualize the locations of mapping clusters on the
object surface. You can toggle this feature and set
thelinethicknesswiththeDisplay setting (page
1–885).