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The Generate, Corner
Blend (Surface menu)
command allows you to create a rounded corner from three fillet
surfaces. All three fillets may have differing radii.
This example shows a corner blend generated from three surfaces meeting at 90 degrees to each other.
The surfaces do not have to meet along straight lines (see example).
To generate the corner blend, select three fillet surfaces. From this information, one or two blend surfaces are created. The fillets are then trimmed back to the edge of the blend surface(s).
This example shows a rendered corner blend where the surfaces meet at 120 degrees:

The parameters for the command are:
Trim Surfaces – Check this box if you want to trim the selected surfaces back to the fillet edge.
Tolerance – The maximum allowable distance between the corners of adjacent surfaces.
Search Grid Density – This is the density of the search grid used when searching for the fillet surfaces. In most cases a density of 2 x 2 will suffice (Search Grid Density = 2). However, for some fillets, a higher search density may be required to find all possible solutions. The higher the density, the longer the command's calculations will take.
Name – Enter a name for the corner blend, if required.
Display – Sets these surface display parameters:
U/V Patch – Enter the required number of patches in the U and V directions.
U/V Display – Enter the required number of display points in the U and V directions.