Edit NURBS > Surface Fillet

Edit NURBS > Surface Fillet > Circular Fillet >

Create Curve On Surface: Turn on Create Curve On Surface to create curves-on-surface when the fillet is constructed. The curves are placed on the surface at the point where they intersect with the fillet.

When Create Curve On Surface is off, curves-on-surface are not constructed on the original surface. The default is off.
Reverse Surface Normals: During the fillet construction, the surfaces are offset in the direction of the normals by the Radius value you specify. By reversing the surface normals, you can construct the desired fillet. Click the Show Manipulator icon to see the surface normals.

Before you create the fillet, choose to reverse either the primary surface normal (the first selected surface), or the second surface normal (the second selected surface). The following examples show both primary and secondary reverse methods with a radius value of 0.75.

You can also reverse surface normals by selecting points on the surfaces and constructing the fillet. For example, the normals on the secondary surface are reversed if the point selected on the primary surface does not lie on the same side as its surface normal.

To reverse surface normals by selecting surface points:

Select a point then Shift-select another point.
Select either Reverse Primary Surface Normal or Reverse Secondary Surface Normal, then click the Fillet button. Click the Show Manipulator icon to see the surface normals.

Editing the circular fillet normals using manipulators

To display the surface normals and radius manipulator after you create the fillet, select the fillet surface and display the Show Manipulator Tool.
Drag a radius manipulator handle.

Use Tolerance

The Use Tolerance options let you apply a circular fillet within a specified tolerance value. You can apply tolerance globally or locally.

Global tolerance causes Maya to use the Positional and Tangential values from the Settings part of the Preferences window.

Local tolerance lets you enter a new value to override the values in the Preferences window.