The soft selection controls
for NURBS models are like the soft selection controls for
editable mesh objects.
Soft selection controls make a point or CV behave as if surrounded
by a "magnetic field." Unselected points or CVs within the field
are drawn along smoothly while you move the selected one.
With this feature, you
can sculpt the points or CVs of a curve or surface. For example,
you can draw a sphere into an egg, or gently curve a flat surface
into hills and valleys.
With soft selection,
transforming a single vertex can move others.
The Soft Selection rollout
for point and CV sub-objects contains the controls for this feature.
The Soft Selection check box is turned off by default.
Before you begin, you
might need to increase the number of CVs or points on the surface.
This allows smoother and more complex reshaping effects.
A single point or CV
works well for many purposes. Moving a point or CV along a single
axis is the most useful for smoothly raising and lowering surfaces.
For multiple points or CVs, you can also use Rotate or Scale.
- Soft Selection
When on, point or CV transforms
affect a region of the curve or surface.
- 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 Type Only
(for point curves and surfaces
only) When on, the transform affects only neighboring points of
the same type; that is, either curve points, surface points, or independent 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.
Distance in current units from
the center to the edge of a sphere defining the region. Use higher
falloff settings to achieve more gradual slopes, depending on the
scale of your geometry. Default=20.
Left: Falloff=20 (the
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. Default=0.
Falloff and Bubble
have their default values.
Expands and contracts the
curve along the vertical axis. Sets the relative "fullness" 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
Falloff and Pinch have
their default values.