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Surface Variable Fillet/Chamfer/Blend > Variable Blend Surfaces 
The VariableBlendSrf command creates a blend surface between edges of intersecting surfaces with varying radius values, trims the original surfaces faces, and joins the resulting surfaces.
The Radius and Distance options appear on the command line when you drag a handle grip.
Radius/Distance options  

FromCurve 
Select a curve. The radius of the curve at the picked location will be used. 
FromTwoPoints 
Pick two points to show the radius distance. 
Handle options  
AddHandle 
Adds a handle along the edges. 
CopyHandle 
Adds a new handle using the distance from the selected handle. 
RemoveHandle 
Visible only when at least one handle has been added. 
SetAll 
Sets the distance or radius for all handles. 
LinkHandles 
Editing a single handle updates all handles. 
RailType options  

DistFromEdge 
The distance from the edge curves determines the intersection. 
RollingBall 
The radius of a rolling ball determines the intersection. 
DistBetweenRails 
The distance between the edge rails determines the intersection. 
TrimAndJoin 
Trims and joins the resulting surface to the input surfaces. 
Preview 
Displays a dynamic preview. You can change the options and the preview will update. 
Fillet, blend, or chamfer between curves and surfaces
Rhino Wiki: Advanced Filleting
Rhino for Mac © 20102017 Robert McNeel & Associates. 24Oct2017