9

1148 Chapter 9: Surface Modeling
Inter face
Soft Selection—When on, point or CV transforms
affectaregionofthecurveorsurface.
Affect Neighbors—When on, the transform affects
points or CVs not only on this curve or surface
but within the entire Falloff region of the NURBS
object.
Same Ty pe Only—(for point curves and surfaces
only) When on, the transform affects only
neighboring p oints of the same t ype; that is, either
curvepoints,surfacepoints,orindependent
points.
Soft Selection Curve—This curve display shows
how Soft Selection will work. You can experiment
with a curve setting, undo it, and try another
setting with the same selection.
Fa lloff—Distance in current units from the center
totheedgeofaspheredefiningtheregion.Use
higher falloff settings to achieve more gradual
slopes, depending on the scale of your geometry.
Default=20.
Left: Falloff=20 (the default)
Right: Falloff=40
Pinch—Raises and lowers the top point of the
curve along the vertical axis. Sets the relative
"pointedness" of the region. When negative, a
crater is produced instead of a point. At a setting
of 0, Pinch produces a smooth transition across
this axis. D efault=0.
Left: Pinch=.5
Right: Pinch=2
Falloff and Bubble have their default values.
Bu bble—Expands and contracts the curve along
the vertica l axis. Sets the relative "ful lness" of
the region. Limited by Pinch, which sets a fixed
starting point for Bubble. A setting of 0 for Pinch
and 1.0 for Bubble produces a maximum smooth
bulge. Negative values for Bubble move the bottom
of the curve below the surface, creating a "valley"
around the base of the region. Default=0.