SoftTransform

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Window

Panels > SoftTransform

The SoftTransform command opens the Soft Transform panel that allows editing object grips with different falloff types within a specified range.

Mesh and SubD sub-objects, NURBS control points or edit points, and Cage points are supported.
Soft transform works with mouse dragging, Gumball editing, and transform commands, such as Move, Rotate, and Scale.
Locked SubD components remain unchanged.

Steps

Run the SoftTransform command.
In the Soft Transform panel, turn Enable on.
Select supported object grips or sub-objects.
Adjust the Radius to define the influence range.
Choose a Shape type to control the falloff effect.
Use Gumball, mouse dragging, or transform commands to editing the selection.

Soft Transform panel

Enabled

Turns soft transform on or off.

Radius

Sets the size of the influence range.

Set radius from sphere

Defines the radius by drawing a sphere in the viewport.

Slider actions

Double-click the slider to enter a number.
Drag the slider past the right end to extend the range.
Drag the slider while holding the Shift key to snap to whole numbers.

When supported grips or sub-objects are selected, Rhino displays a visual cue for the affected area and the grips display as solid points.
In shaded display modes, influence strength is shown with a color gradient.

Distance Measure

Controls how neighboring grips are found.

Spherical

Uses the radius from the selected grip.

Along object

Expands or shrinks the influence range toward adjacent object grips or sub-objects.

This mode enables the Count U and Count V sliders in the Surface section, which control the influence range of surface control points.

Shape

Controls how nearby grips are influenced within the radius.

Smooth

Influence strength decreases slowly near the center and near the edge.

Linear

Influence strength decreases at a constant rate.

Round

Influence strength decreases slowly near the center and quickly toward the edge.

Sharp

Influence strength decreases quickly near the center and slowly toward the edge.

Falloff Color

Sets the display color used for influence strength, which can be visualized with a color gradient on the objects.

Surface

These settings are only available when editing surfaces.

Count U/V

Controls the influence range separately in the U and V directions when Distance Measure is set to Along object.

Surface boundary constraints

Control whether control points near the U Min, U Max, V Min, and V Max surface edges are moved to preserve the desired continuity.

None

Do not constrain control points along the surface boundary.

G0

Locks the first row of control points along the boundary.

G1

Locks the second row of control points along the boundary.

G2

Locks the third row of control points along the boundary.