Could NURBS surface be changed to plane surface?

Rhino Rhino for Windows
1

Hello,

I created one complex geometry of plane surface, but it had a lot of gaps between each plane surface. So I converted the geometry into mesh, and I filled the gaps. But I wanted the filled mesh geometry to have surfaces rather than mesh. So I converted the mesh geometry into NURBS surfaces. However, the geometry has had a lot of NURBS surfaces rather than plane surface. I was just wondering if the NURBS surfaces could be changed to plane surface without the gaps.

Thank you

2

Hi Zas,

I bet there is way to fill those gaps without converting to a mesh. Could you share some screenshots and/or a 3dm file?

With that said, it’s easy to go from NURBS to Mesh but it’s much more difficult to go from Mesh to NURBS. The new Rhino 7 release has a command called QuadRemesh which makes it easier to convert meshes into NURBS. Here are some articles on this topic.

https://wiki.mcneel.com/rhino/meshtonurb

3

MergeAllCoplanarFaces will merge all coplanar surfaces of a polysurface into single trimmed surfaces. Note that this command only works on a polysurface. Individual surfaces need to be joined into a single polysurface to use it.

It is almost always better to stay working with NURBS surfaces rather than convert to meshes if the final result needs to be NURBS.

4

Thank you for replying.
A file has been attached. The file has contained two surfaces which need to be joined appropriately.

File .3dm (1.3 MB)

5

How did you create the surfaces?

What are the constraints on the surfaces?

6

image
image1294Ă—772 70.1 KB

You can untrim the two edges where you want to join, extend both surfaces and trim again.

7

Hello,

Thank you very much for replying.
I tried to to do what you had told me, but it did not work straightforwardly
Could you elaborate your explanation, please?
Did you use actual “untrim” to either of Surface 1 or Surface 2, or both of them?
“Untrim” worked to Surface 2, but it did not work to Surface 1, when I tried.

Did you also use “Extend Surface” or “Trim”? I would like to get the details of how you did it.

Thank you

image
image1228Ă—813 74.1 KB

8

I untrimmed both edges and extended them by 400. I tried 200 too but that didn’t work

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9

Hello,

Thank you very much for making the video.
Extending the surfaces by 400 worked, interestingly.
However, how could the two edges be selected at the beginning?

Thank you

10

ctrl+shift+LMB

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11

Thank you very much for providing the helpful advice.
The problem has been solved.
Thank you

File (2).3dm (1.4 MB)

1 Like