Joining Nurbs-Vertices

Support Modeling
1

Hi everyone

I guess this was maybe asked before and I’m using the wrong terminology, so i can’t find any solution by myself.
I’m in the process of evaluation, if blender can be a replacement for CAD, so i started working with curves.
One thing I cannot figure out is: How do I join vertices of a Nurbs-Curve. I do not want to join two separate curves, but the start and end-points. If I do cyclic U, the curve disappears. If I press F, same thing.
So, how do i connect vertices of a curve, so that i becomes a closed curve?

Thanks for your advice!

2

Hi,

I answered something similar before:

3

Thanks for your reply. Thats solves one issue. But how can I create a surface from a surface curve? Is this even possible, or do i have to start with an actual nurbs surface?

4

Select all the vertices while in Edit Mode, press A and hit F to fill the surface.

You would need to use Nurbs Curve for that one.

5

Thank again, I think i can work with that :slight_smile:
Do you also know, how I can patch the curve afterwards, so It becomes a surface?

6

What do you mean?

7

So if I first draw a curve with the surface curve, there is no actual surface, it’s “empty” like in the example of the StackExchange Link.
In Rhino or other Cad there’s a command called “Patch” or “Loft” to create an actual surface from a curve.

8

To fill them, just select all the last vertices and hit F, and there you go:

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Or, select them all, RMB and choose “Make Segment”

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9

Oh, wow thanks. That works great. I just tried it out.

Maybe for my original question. this clarifies it. I have my curve, but if I press F, it means “too few selections to merge”. I there a way to fill a singular curve?

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10

I don’t think it’s possible with Nurbs Curves, but if you would be possible if you convert your Nurb Curve into a Mesh.

Just select your Nurb while in Object Mode, hit RMB and select Convert To → Mesh, then select your Curve again, switch to Edit Mode, you’ll see that the amount of your vertices has been increased. Now you can select two neighbors vertices and connect them with each other.

Something like that:

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11

OK, thanks a lot for clarifying. That was really helpful!

12
  1. Select TWO vertices if you want to just make a straight line.
  2. If you want to fill out the FACE then do the step 1 above, then select all the neighbors vertices as shown in the screenshot up above and hit “F” to fill out the face.
  3. If you want to be able to fill out the face after converting your Nurbs Curve into a mesh, never make a duplicate of your Nurbs with the next filling out its face as I have showed above, otherwise, you won’t be able to fill out the face after converting it to a Mesh, because, if you do so, after converting it to a Mesh and when you go to a Edit Mode, you’ll see that your face has already been filled out.

Hope that helps

Cheers,
Sergey