Commands
Fillet Surface
Fillet Surface
The FilletSrf command creates a constant-radius round surface between two surfaces.

Steps
-
Select the first surface.
Click the surface at the side you want to keep after filleting.
-
Select second surface.
Click the surface at the side you want to keep after filleting.
Command-line options
Radius: Sets the radius of the fillet surface. It will be the initial value of the Radius slider in the options dialog.
Options
Radius: Move the slider to change the radius, or double-click on the slider to enter a value.
Range: Click a number button to change the range of the slider for smaller or larger adjustment.
Blend Type
- Arc Creates a fillet surface with arc sections and tangent (G1) to the input surfaces.
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- Deformable: Adds more control points to the fillet sections for adjusting tangency and bulge.
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- Deformable degree: Sets the degree of fillet sections from 3 to 5
- Tangent: Moves the second points on both ends in the tangent direction.
- Bulge (For degree 4 and 5): Moves the point(s) in the middle to make the fillet sections sharper or flatter.
- G2 Blend: Creates a blend surface connecting to the input surfaces with curvature (G2) continuity.
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Trim: Uses the output surface to trim the input surfaces when possible. History is supported when the Trim checkbox is disabled.

Extend: When one input surface is longer than the other, the fillet surface is extended on the longer edge.

For more information, please refer to the Rhino documentation.