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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 review the first of Rhino's modeling aids, in order of location on interface, called Snap. It's important to note that this modeling aid is snapping to the grid, so actually it might have been better called Grid Snap, but it's not and don't ask me. The point is, do not be confused between Snap to the grid and the Osnap, a couple of options down. That is snapping two objects, which we'll cover a little bit later. We're also going to check the control panel, and see where you can make changes to the grid's appearance.
Let's start off by maximizing the Front viewport. I'm seeing a lot of extra grid lines here, so I'm going to modify those settings by going to tool's options, and we have the minor grid lines set to 1 unit. I'm going to change that to 10. The grid will automatically update. A little tip here: you want to have the Snap spacing the same number. Otherwise it's snapping to lines you cannot see. Hit OK to accept. I've got some reference geometry in the scene to help guide me building this robot head.
So, let's start off with a Polyline command, and I haven't turned the Grid on, so I'm not able to Snap to any of those intersections. Let's turn that on. We can go down to the toggle, and if it's bold, it will now Snap to those points. The shortcut for that is F9. I'm just going to draw the head, so this should end up being symmetrical if we count an equal number of grid spaces each direction of the axis. Now note we can still do further editing if we highlight it.
Turn the control points on with F10 and just drag those two other points on the grid, put it back to the original position, turn it off with F11. Let's continue with another polyline and draw the robot mouth. So, we've only drawn few lines, but we've made several important first steps. First, we know how big the model is, since we set each grid square to 10 units, as opposed to some other number. So we've avoided surprises later.
Secondly, we made our symmetry accurate since we just counted equal number of grid units to each side of the origin, and finally, we created geometry that's clean and closed.
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