Scripting FreeCAD from Rhino: FilletEdge case

I recently started working on a Rhino.Python script that accesses another CAD application / modeling engine via scripting without leaving Rhino’s GUI. The script is an alternative to _FilletEdge for when Open Cascade, via FreeCAD, can solve some constant radius, rolling-ball problems like those reported to the forum and/or are currently listed as Bugs in YouTrack.

I’m using Rhino 7, 7.13.21348.13001 and FreeCAD 0.019.24267 on Windows.

The following are a couple of examples of _FilletEdge vs. FreeCAD’s Part Fillet. Both FreeCAD/OCCT’s solutions include a patch-like surface at intersection of the edges. (Notice the setback fillets in the last GIF. They were not specified.)

(Stubborn Corner)

(4 Corner fillets)

I’m going to work on the script more before publishing it.

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