NURBS Curve / Surface Output

Слиты nikitronn запросил слияние nurbs_surf_out в master

Created by: portnov

This adds two nodes:

  • NURBS Curve Output
  • NURBS Surface Output

The nodes create Blender's NURBS objects. Note that NURBS support in Blender is limited; for example, there is no way to specify the knot vector explicitly.

Also there is some problem in Blender (to be reported later, I think), due to which I have to avoid creating an object during scene update events. Updating existing object works fine.

Screenshot_20200229_113920 Screenshot_20200229_214359

Preflight checklist

Put an x letter in each brackets when you're done this item:

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Manual testing done.
  • Unit-tests implemented.
  • Ready for merge.