- [Instructor] Under the surface tab, there's a couple
of ways you can get a base NURBS element as a primary
surface as well.
Well, those is what's called a four-point surface.
And with this, you can come out and pick four points.
In this case, this is just a mesh.
And it'll string a surface through those four points.
That's one way to get that.
Once I select okay, you'll notice it creates a body
in the tree.
And that is a NURBS surface.
It doesn't have any history or anything like that.
I'll just undo that.
And another way that you can get a NURBS surface
is to use a tool called fit surface under the more gallery.
With fit, it allows you to create planar, spherical,
and so on type surfaces.
In this case, I want to freeform.
What's the object that I want the fit surface to go through?
That's my object.
And with this, I can also specify if I want to use
a CSYS or best fit or whatever that may be.
But in this case, I'm just going to use best fit.
And it's going to go ahead and put this surface in
through that mesh.
And here I could increase or decrease the parameterization,
the degree of the surface.
If I decrease it like I just did, you'll see
it deviates further.
If I increase it, it's going to get a little tighter.
If I increase this, same thing, a little tighter.
I want closer so now I'm really close to that surface.
So when I select okay, in the tree it creates
this fit surface.
And you can see it's called freeform.
And I can go in and begin manipulating the control points
off of this, matching surfaces and so on and so forth.
So this is a really good way to create surfaces
off of an STL.
If you don't have an STL or if you just need to create
some random surfaces through points out in space
you use the four-point surface.