Hi all, I have a little trick that I discovered just today and wanted to share it with you.
I found an easy way to convert the subdivision surfaces, in to nurbs surfaces.
To do this you need two free programs ’ FreeShip_Plus ’ and another to convert VRML format ’ 1 ’
First you need to export your files from Blender, eliminating the subdivision modifier and export to obj with the Z axis at the top, after using the program “meshconv” to convert from obj to wrl.
Open ’ FreeShip ’ and import the VRML format 1 of your object and go to export in IGES and you’re done you’ll have the nurbs surfaces generated from the cage of your mesh object.
Then import your IGES file with FreeCad and export it in STEP to others CAD
Usage: meshconv -c wrl -vrmlver 1 blender-file.obj
and if this has problem use that for Win FreeShip_win.zip (2.1 MB)
I wonder how many people were expecting this XD, I have been trying a solution to this problem for many years.