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Surface Tools


Blend Surface

 History enabled

The BlendSrf command creates a blend surface between two surfaces.

With Record History on, the result can pay attention to changes in the input objects and have its own input settings changed using the Edit command line option.


  1. Select a surface edge.
  2. Select adjacent edges or press Enter.
  3. Select the edges to blend to and press Enter.
  4. Select adjacent edges or press Enter.
  5. Select and adjust control points or press Enter.
Command-line option


Automatically selects surface edges that are touching the selected edge.

How to chain select edges.


For blend surfaces created with history, edit the blend settings and handles. The original settings are maintained and you can change individual settings.

Keys for control


By default the shape curves are separately edited at each end, Hold Shift to retain symmetry. With symmetry, point editing is mirrored to the other end of the curve.


Hold Alt while dragging the handles to change the angle between the shape curve and the surface edge.

  • By default the shape curves are perpendicular to the surface edge or parallel to the surface isocurves.
  • If the edge is trimmed, the shapes are perpendicular to the surface edge.
  • If the edge is untrimmed, the shapes are parallel to the surface isocurves.

To drag seams (closed cross-section curves only)

  1. Select a seam point marker, and move it along the closed curve.
  2. Continue to adjust the seam points until they line with each other and the closed curves all have the same direction, and then press Enter.

Adjust seam options


Reverses the curve direction.


Attempts to align the seam points and directions without intervention.


Moves the seam points to the way they were at the beginning of the command.

Adjust Surface Blend options


Maintains the relationship between the two curve ends.


Determines the distance of influence the surface has on the edge curve.

Sliders (2) control each surface end.
Lock sliders icon (1), surface end bulge controls (2).
Continuity options

Sets the continuity for each surface end.






Add Shapes

Adds additional curve profile shapes to increase control over the blend surface shape. This is especially important if the input shapes are complex and you want to control the shape in more locations.

When you snap to a point and add a shape, the command automatically creates a shape that connects to the corresponding point on the other side, which attempts to keep the blend simple.

Remove Shapes

Remove curve profile shapes.

Interior shapes

Turns on or off including all of the shapes at Greville points for simple blends. The use of interior shapes takes the entire surface edge selection taken into account for continuity.

Planar sections

Forces all shape curves to be planar and parallel to the specified direction.

Same height

If the gaps between the surfaces vary, this option maintains the height of the shape curves throughout the blend.



See also


Visually evaluate surface smoothness and continuity using a stripe map.

Fillet, blend, or chamfer between curves and surfaces

BlendSrf History




Rhinoceros 6 © 2010-2020 Robert McNeel & Associates. 21-Feb-2020