Help in mixed SubD / NURBS workflow

Grasshopper
,
1

Created this setup for a special SubD/Nurbs workflow:

imported a level0 mesh from another app
1 converted the mesh with toSubD in Rhino
2 converted the SubD with toNurbs in Rhino
(all three objects on layers in the Rhino file)
3 referenced the NURBS Brep to Grasshopper
4 build a ridge line in Grasshopper based on referenced Rhino points
5 built the Grasshopper def to get control over the tangents of the ridge with sliders for each ridge segment.

Now to get e real relational SubD workflow i would need to perform the first two steps (toSubD, ToNurbs) in Grasshopper. This would give me the possibility to easily change the overall geometry by dragging the vertices of the original level0 mesh (same as the referenced ridge poits).
Unfortunately i am still on Rhino 6.

Any help or idea is highly appreciated, thanks in advance!

SDS_2_NURB.3dm (339.4 KB)
SDS_2_NURB.gh (39.1 KB)

SDS_2_NURB
SDS_2_NURB1762×1277 355 KB

2

Not in 6?

image
image1920×917 75.9 KB

3

thanks for the information, this looks very straight forward and promising. does the Brep component really make the conversion from SubD to NURBS?
And as in the SubD component I dont see any options (as in the toNURBS and toSubD command line).

to answer your question:
no, not in V6 … but definetely a good reason to upgrade.