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Geometry Fix


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The Smooth command averages the positions of object points or vertices. This command is useful for removing unwanted detail, and for removing loops in objects.

When mesh vertices are selected, you may have to use the WeldVertices command before smoothing in order to prevent the mesh from pulling apart.


  • Curves, surfaces, meshes and SubDs

  • Control points, edit points and mesh vertices

  • SubD control net points and edges

  • SubD surface points (Turned on by EditPtOn)

  • Mesh vertices, edges and faces (select with Ctrl+Shift)

  • SubD surface points, edges and faces (select with Ctrl+Shift)


To smooth part of a curve or surface

  1. Make a supported object type points on.

    Or, select object points, edges or faces with Ctrl+Shift.

  2. Start the Smooth command.

  3. Click the check boxes for the coordinate directions and adjust the Smooth factor.
    The selected object points will move slightly to smooth the object.

To set one check box and clear the others

Smooth Options

Smooth X / Y / Z

Smooths only in the specified x, y, or z direction.


Fix Boundaries

Prevents naked edges or endpoints from being moved.

Meshes: Vertices along naked edges will not be modified.

Curves: End control points will not be modified.

Surfaces: The control points along the boundaries of the surface will not be modified. The edges and trims of trimmed surfaces will be modified if they do not coincide with the surface boundary.

SubD: Surface points or control net points along the boundaries will not be modified.


World / CPlane / Object coordinates

Use world or construction plane or object u, v, and n coordinates to determine the direction of the smoothing.

Smooth factor per step

Sets an amount of smoothing.

0 to 1

Object points move toward the average.

Greater than 1

Object points move past the average.


Object point move away from the average (roughing).

Number of smooth steps

Specifies the number of steps to iterate the smoothing factor through.


See also

Edit curves

Edit surfaces




Rhinoceros 7 © 2010-2024 Robert McNeel & Associates. 10-Apr-2024