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Working with NURBS, seams, and avoiding the pinch

Working with NURBS, seams, and avoiding the pinch - Rhino Tutorial

From the course: Rhino 5 Essential Training

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Working with NURBS, seams, and avoiding the pinch

Before we start building organic surfaces, let's expand upon the fundamentals of NURBs. We've already discussed that all NURB surfaces have two directions, and a closed surface will have a seam. Let's take a look at a few examples to illustrate. I'm going to zoom in on this simple and open flat plane. You'll see right off the bat, we have two iso-curves going in each direction. Those are labelled as U and V by Rhino, and an open edge along the outside. Now these iso-curves are just meant as a feedback mechanism. They don't always necessarily indicate complexity. For example, we can turn them off. I'm going to the Properties here, and I deselect Visible, so it's gone completely, or I can turn it back on and just increase the density. So the surface itself hasn't changed, it's really just a personal preference of how much visual information you'll need. So if that's surface then wrapped, we'd end up with the seam internal, so that's kind of captured there and in all of these you'll see…

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