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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 continue to talk about the final three options or modes that appear in the Osnap toolbar, which we will keep open and docked for the remainder of these lessons. The reason I'm calling them modes is that they work in conjunction with the ten other Osnap options. In fact, if you don't have any Osnap option selected, then neither the Project or Smart Track are of much use. So, we are closing in on the final design for this next shape, so there is less geometry in the way. I'm going to draw the first curve here, using the Project option.
So, this works by searching for an Osnap anywhere and then forcing that point to be drawn flat on the construction plane. Let's start by making sure the End point Osnap is selected, which it is, and we're going to draw a Polyline from this intersection, and I want to, in the Front viewport, just draw to that perceived center. So, notice that it is searching for an intersection. It goes to the back end of that line.
It looks fine from the Front viewport, but in the Perspective viewport, it's not exactly where I wanted it. So, I'm going to hit Delete, and we're going to select the Project option and do the exact same line from the same two points. Polyline from the intersection here, and then when I click on this point that I prefer, notice what the Perspective window is doing. It's finding the End point snap but then flattening it back out to the Front view construction plane.
Next up, we'll talk about the Smart Track. I'm going to maximize this Front view by double-clicking the name, and here is the final geometry. We'll just take a look for reference before we build our own. Notice how comes down from the end point and that it aligns with this reference geometry here, and the final edge aligns with the mouth up above. That's what we want to recreate. I'm going to go ahead and hit Delete. Turn on Smart Track, so this creates a series of construction lines that fly out in several different directions looking for intersections to align to.
Let's get this geometry out of the way. I'm going to select and hit Delete. I'm going to go to the Polyline command, and just start form this End point. Now it's going to search for typically Ortho's, which are at every 90 degrees. Without clicking just come over here and have it take a peak. By that, I'm just pointing it, the End point lights up, and I come back and now I found an intersection that's got an alignment. So, let's do it one more time. I'm going to move.
I've clicked, and I'm going to continue over here. Just found an angle. Now I'm going to go do the same thing up here and just let it rest without clicking to indicate that's my Reference point. So, I'm going to come straight back down. It will find the Ortho projection from those last two points. So, I can click again and then complete it here at the bottom. Right-click to exit. Now I'm going to turn off Smart Track and just to explore little bit of a free form neck shape by using the Control Point Curve over here.
I'm going to go ahead and turn on couple of these object snaps, probably way more than you ever would. But just to demonstrate that we can draw shapes and not have everything snap to Perceived Intersections or Osnaps. You can do that one way by clicking Disable button, and as I draw, it will not find any of those. It's probably not as helpful because I couldn't start from anywhere accurate. So, I'm going to go ahead and escape out of this.
Deselect Disable and try a better way to do it. So, I'm going to restart the Free Form Curve. I do want to snap to this point here, so I'm going to use that. Now if it ever pops up again, I'm just going to hold down the Alt key and it'll ignore any Osnaps in the vicinity. So, I've got the Alt key pressed. Then I can just release and let those turn back on. Alt key is back on, so it's going to ignore, ignore, and then release, so I can snap.
So, the wide variety of Osnap options use in conjunction with Project and Smart Track will provide quick and efficient means to keep your curves where you want them to go. A final note: all of the Rhino provided modeling aids are there to help you, but you are never forced to use any of them. Some people actually prefer to bypass the features of Smart Track and Project and draw their own construction lines. But if you prefer to see the construction lines, then by all means use whatever method that makes the most sense for your project.
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