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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.
Next up, we'll review the second of Rhino's modeling aids in order of its location on the interface called Ortho. The Ortho modeling aid or Ortho Snap is simply an angle constraint that is used to verify that any geometry being created or moved is done so along a specified angle. Let's take a look where it's located. Here is the label Ortho. We click it to activate it and click it again to turn it off, so it's just toggle. You can also use the shortcut F8 key. It's the same result.
I'm going to leave the settings from the file to file and go ahead and just try to draw lines and see what happens. So, I'm going to go over here and draw a Line Segment with a right-click, and I'm going to check one more setting over here at the Osnap. I want to start it at this point, so I'm going to verify that that is currently set to a Point object snap, which we'll discuss later in the chapter. So I am snapping to the point. Since Ortho is not on, I can freely draw at any angle.
I'm going to hit the F8 key to turn it back on. Now I'm snapping every 90 degrees, and that's the default setting. So, I'm going to escape out of this command and go change that. I'm going to go to the Options Button, and under Modeling Aids, you can see the 90. I'm going to change that over to 45 degrees, see if that helps. Go back to Line Segments, which is a right-click. We're snapping to the point. Now as I go up it's constrained to vertical and jumping every 45 degrees, so that can go in any direction.
I'm still not happy with that angle. I'm going to escape out of this command and go one more time back to the Options, type in 30, hit OK, and then do one more line segments That looks about right. Now you could additionally change that to a smaller increment, which would be very tempting, such as every five or ten degrees, but I don't recommend going any smaller than about 30 because it's way too easy to make a mistake.
20 degrees will look almost like 25 degrees. You won't notice it till much later. One more shortcut tip. I'm going to draw another segment, just as a test, turn the Ortho snap off. Now I can activate it any time just by holding down the Shift key. So notice it activates without going down to click on the Ortho button, and escape out of that. So, the Ortho Snap is a great example of a very simple and sometimes easy to forget modeling aid that's often overlooked.
Another nice feature of the Ortho Snap is you don't even need to turn it on when needed. Similar to many 2D programs, you can always hold down the Shift key when drawing or moving and the Ortho Snap will be enacted just for that command. It's a nice shortcut that will greatly speed your workflow.
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