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In Rhino 4.0 Essential Training, author Dave Schultze shows how the 3D NURBS-based modeling tools in Rhino 4.0 are used to engineer products from toy robots to full-sized aircraft. This course concentrates on using Rhino 4.0 for industrial design and rapid prototyping, with a review of common 3D terminology using specific examples. Along with a comprehensive exploration of the Rhino interface, the course includes an introduction to building 3D objects with Rhino's three primary entities: the curve, the surface, and the solid. Exercise files are included with the course.
In this video, we'll explain how important modeling aids are by showing two examples. The first model uses clean and simple curves, thanks to the use of various modeling aids, so that their accuracy is guaranteed. The second model was built without the modeling aids. We'll see just a few of the kinds of problems that can crop up early and only get worse. So, our goal here is to create clean curves and close curves. Let's take a look at these two examples. I'm just going to select them both, and then hit F10. It's a shortcut, but we're just turning on the control points.
So, in our good example, you'll note that the control points are nicely spaced and are a bare minimum of those needed to define the form. Let's take a look at the bad example. It pretty much looks the same overall, but up close, there's some serious problems. Now I want to get even tighter here, so I'm going to do a little trick. I'm going to highlight these three control points, and then use the Zoom Selected command, so I can really pull in. Now here you see a little kink, which is going to be a problem later.
So, let's leave that alone for a minute, and the other problem we have on the opposite side is a gap. These are both very easy mistakes to make. So, let's see what kind of problems they cause a little bit later, and then we'll do the fix. I'll zoom back out, turn the control points on, and for example, I'm going to make a solid out of both shapes, which will be capped and a fillet placed on the edge. So, I am going to select the shape, go to the Solid menu > Extrude Planar Curve > Straight up, go ahead and type in 50 , and looks like we have a nice clean solid as a result, just double check here.
I'm going to go ahead and Fillet the edge, so same menu Solid, lower level, Fillet Edge. I am going to select that edge along the top and type in a Radius of 2, hit Enter, a little bit of a preview, hit Enter one more time, and it looks very clean. So, we've got a solid which is closed, no gaps anywhere. Let's try the same command with the bad curve. Now select it, go to Solid > Extrude Planar > Straight, type in 50, notice there's no cap.
It cannot be capped with these two problem areas. We have a gap and the loop. So, let's go ahead and undo this. I'm just going to delete the surface, select, hit the delete key, turn the control points on, see if we can do a little cleanup work on here. I'm going to select them and Zoom Selected, so we get in close. Now on most curves we can go ahead and select the points and just hit the Delete key to get rid of them. So, we basically simplify the curve, which is our ultimate goal, and it is so close, so good news.
The other problem area where we had the gap, a couple of ways to close it, but I'm just going to drag and snap to the other side. The Rhino knows that this is closed everywhere else, so when I have the two endpoints connected, it is now closed everywhere. Hit F11 to turn control points off. I'm going to go ahead and try to make a Solid out of it. Type in 50. Looks good. Let's try the Fillet. Select the edge.
If you select the wrong edge, you can just hit the Ctrl+Click to deselect and then pick another curve. That happens a lot, right-click to accept, and it looks like we've fixed the problem. So, the quality and accuracy of your curves directly affects the model for a long, long time afterwards, actually forever. So, it's always worth to slow down a bit and make sure that every point is connected to where you assumed that it was being connected. A few minutes of care upfront using the modeling aids will potentially save hours of repair work later on the final model.
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