The FilletEdge command creates a tangent surface between polysurface edges with varying radius values then trims and joins the original faces to the fillet surfaces.


1. Select edges.
2. Select handles.


Moving a handle at the end of the edge will cause the fillet to extend beyond the surface. This will have to be trimmed by other means.


Always fillet from the largest radius to the smallest radius across a model.
Remove any edges you can prior to filleting with MergeAllFaces or by way of surfacing in a simpler manner. Fewer intersected edges = Fewer problems as the fillet rolls along any edges and tries to trim and join with the adjacent surfaces.
Make sure there is enough room for the fillet surface to trim and join with adjacent surfaces. The angle relationships between surfaces, sharpness of the bend in the rail around corners and rail type all play a part in any particular case.

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.


Trims and joins the resulting surface to the input surfaces.


Allows selecting more edges after the selection has been closed.

See also

Fillet, blend, or chamfer between curves and surfaces

Rhino Wiki: Advanced Filleting

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