FreeCAD Sverchok & Subd To Nurbs

Coding Released Scripts and Themes
51

Hello
finally I found the time for freecad R&D )))
Please help me to convert subdiv to solid
I try your script, but have a trouble

Screenshot_20200831_141301
Screenshot_20200831_1413011920×1080 263 KB

Traceback (most recent call last):
  File "/home/bm/.config/blender/2.83/scripts/addons/FC_Subd_to_Nurbs.py", line 86, in invoke
    self.execute(context)
  File "/home/bm/.config/blender/2.83/scripts/addons/FC_Subd_to_Nurbs.py", line 82, in execute
    SUBD_TO_NURBS()
  File "/home/bm/.config/blender/2.83/scripts/addons/FC_Subd_to_Nurbs.py", line 177, in SUBD_TO_NURBS
    triad = [op[0],b,op[1]]
IndexError: list index out of range

location: <unknown location>:-1

In 2.9x script just crash blender

I try sverchok nodes too

Screenshot_20200831_141807
Screenshot_20200831_1418071920×1080 314 KB

But can’t find a way to export to freecad
(exept json, but i don’t know what is it cube.json (415.6 KB) )

Please help)