I'm going to hit escape twice to get back out, so we now see that a mesh is fine for reference and NURBS are much better for modeling. This is much more useful, if it's a reference, you're going to leave it somewhere and then design on top of it. So back to this editing idea, if we want to pick several of these to practice moving and editing just for fun, although I don't recommend it, we can turn the control points on and you can see right away, that that's not a very useful type of operation to edit. Then I typically will rebuild a NURB surface, right on top of it, trying to match it as closely as needed. In that case, I recommend you bring them in and get them into position, put them on their own layer and lock that layer. Now it's not always useless and frustrating, these can be great for reference geometry, if you have no other source of information.
We'll do that when we get into prototyping, more commonly though, it's an import from other types of software. There are several ways to make this, you can actually convert a NURB surface to a mesh inside of Rhino. So you can see right off the bat, much sharper and angular, even though the ones in the back look a lot smoother due to these tiny small edges. And so therefore more complex surfaces can work well, if you need smaller details, I'm going to hit escape twice to turn off all the control points and zoom back out, so we now compare our mesh friends here. So with closer spacing here, you can drag a box around a small group and push and pull them in or out. However, sometimes you need smaller detail on an otherwise clean and smooth surface. So if this shape described what you wanted, including further editing, this would be great. So I'm going to select both and we'll explore this idea. Now these are actually very similar surfaces, they just have higher degrees of resolution. We've got two NURB surfaces created by the loft from earlier and their best uses are again, simple, clean modeling and easy editing. So it's going to be very challenging, to make anything with these sharp edges. So it's hard to get anything very smooth or clean using a mesh. The reason is, these edges are actually separate little planes, either triangles or rectangles joined along these common edges. And as far as editing, I recommended, don't even trying. Over on the mesh side, we notice right away, it's very jagged. They're used mostly for reference so that we know the complexity of the surface and for visual feedback.
The curves going across the surface are actually isocurves. A NURB surface typically is very smooth and clean and is easy to edit, which is why we love them. We're going to discuss the difference between NURBS and mesh. We just talked about the different types of curves, so now let's cover surfaces.
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