Making surface from flatten list of points

Grasshopper
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Hello I have a Sub D surface and I referenced it to the grasshopper. Now I want to make a surface out of this geometry. I got it components from deconstructing brep, but I am unable to create a surface from those points. Can anyone help me on how to do it? I think I am confused on how the component surface from point works.

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21498×667 72.6 KB

shape surface from points.gh (12.7 KB)

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I won’t say it’s impossible but I gave up on points and settled for Loft using SubDEdges:

surface_from_subd_2020May22a
surface_from_subd_2020May22a1682×492 172 KB

surface_from_subd_2020May22a.gh (20.2 KB)

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Come to think of it, SubDEdges isn’t necessary as DeBrep ‘E’ works fine:

surface_from_subd_2020May22b
surface_from_subd_2020May22b1682×492 174 KB

surface_from_subd_2020May22b.gh (19.6 KB)

In both cases, however, the volume of the capped surface (12856) isn’t precisely the same as the capped SubD (12820). 100.28%.

1 Like
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i think if we can put the points tree in a fashion as followed by divide surface, then we can achieve surface from points too.

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Prove it! :sunglasses:

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No takers yet? What I found is that the SrfGrid (Surface From Points) has two problems:

  1. It’s smaller than the original ‘SubD’ surface.
  2. It’s not closed. This can be fixed in the cyan group by duplicating the first point of each cross-section and then Shift List.

surface_from_subd_2020May22c
surface_from_subd_2020May22c1612×507 318 KB

surface_from_subd_2020May22c2
surface_from_subd_2020May22c21612×507 317 KB

surface_from_subd_2020May22c.gh (23.8 KB)

2 Likes
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That is amazing !!

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hi
am getting and error some thing like this !
sub d error

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You need to work on Rhino WIP 7 for SubD surfaces. It is the feature only provided for Work in progress versions.

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thanks am using 6!

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Do you mind explaining how you created this SubD surface? Did you use Grasshopper or create it manually in Rhino?

Here is a variation on lofting, using the points to create curves in the other direction. The volume of the capped surface (12969) is even larger than before, compared the capped SubD (12820). 101.17%

surface_from_subd_2020May23a
surface_from_subd_2020May23a1333×369 185 KB

surface_from_subd_2020May23a.gh (19.3 KB)

1 Like
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Hello thank you for your reply. Yes I used the sub D tools of wip version of rhino. Then I referenced that surface to GH later on