What's the principle of matching nurbs surfaces in rhino?

To resurrect this old thread…

I’m really interested in the construction shown in image13.jpg above, and am trying to recreate it.
I can’t follow the process from this image though. @asdfsjal - Could you please describe the steps?
Or anyone else who has managed to reconstruct this?
I was able to do something similar to @Niels’ construction and gradually moving the point along the intersection of 2 planes, but it seems the earlier post implied an entirely constructive technique?

I’ve recently been trying some new stuff using relaxation with Kangaroo to maintain G2 between surfaces: https://vimeo.com/239818980

but so far only managed this when the edges are also kept G2, so it can’t do star points like this.
If I had a geometric construction based on intersections/reflections and so on, then I think it would be possible to include into the relaxation as a constraint to be enforced iteratively and bidirectionally.

Thanks,
Daniel

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