The BlendEdge command creates a curvature-continuous blend surface between polysurface edges with varying radius values.

The polysurface is trimmed and joined to the blend.


1. Select edges.
2. Select a handle.

Command-line options


Controls the display of the current radius in the viewport.


Specifies the radius for the next handle.


Automatically selects curves that are touching the selected curve.


In cases where the command is canceled or ended prematurely, the PreviousEdgeSelection option re-selects the previously selected edges. Supports multiple sets of previously selected edges for up 20 previous edge sets.

Radius/Distance options

The Radius and Distance options appear on the command line when you drag a handle grip.


Select a curve. The radius of the curve at the picked location will be used.


Pick two points to show the radius distance.

Handle options


Adds a handle along the edges.


Adds a new handle using the distance from the selected handle.


Visible only when at least one handle has been added.


Sets the distance or radius for all handles.


Editing a single handle updates all handles.


Only added handles can be removed.
The default handles at the ends of each open edge segment cannot be moved or deleted. This is the minimum information the command needs in order to work.
The handle at the end of a single closed edge can be moved but not deleted.

RailType options

Three rail types control the intersection.


The distance from the edge curves determines the intersection.


The radius of a rolling ball determines the intersection.


The distance between the edge rails determines the intersection.


Always blend from the largest radius to the smallest radius across a model.
Use MergeAllFaces or other modeling method to remove as many edges as possible. Fewer intersected edges = Fewer problems.
Make sure there is enough room for the blend surface to trim and join with adjacent surfaces.
The success of the blend operation depends on the angle relationships between surfaces, the sharpness of the bend in the rail around corners, and rail type.

See also

Fillet, blend, or chamfer between curves and surfaces

Rhinoceros 5 © 2010-2015 Robert McNeel & Associates. 17-Sep-2015