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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, let's take a look at the Group command and how it can be used to organize your geometry. If you've used other editing software, either for 2D or 3D, then you should be familiar with this command and how it works. One nice addition is that Rhino lets you add objects to the group, subtract objects and even give the group a name. So, let's take a look. Most of the Grouping commands are available through the Edit menu and Groups, although there's a few options missing. So, let's skip that and then say we're going to go over to the Group icon in the main toolbar.
I'm going to click and hold to get the flyout and then drag the Titlebar over, so we'll see a few extra commands this way. I'm going to go ahead and group all of the objects into the head, from the neck up, so I am just drawing a box around it, click on the Group icon, or I can hit Ctrl+G for a shortcut. Now let's go ahead and give it a name as well. We'll call this the head. I'm going to go ahead and select the rest of the objects below the neck, group them, click on the Name button, call them body.
And I have just realized I don't want to include this antenna inside the head group. So let's remove those from the set. I'm going to select Remove from Group, and we'll just pick each object one at a time, hit Enter when done or right -click, so those are now removed. And if I select on the head anywhere, you'll notice that the antenna objects are not included in that group, everything else is and remains that way.
Let's try to use our group names to select it that way. I am going to go to Edit > Select Objects > By Group Name. It will give me as default the last group name created. I'm going to type in head and notice the head group now lights up. Okay. I'm going to go ahead and undo both of those groups, so I can just select by clicking on them, and this icon here is for Ungrouping, and I can select on the body group.
To ungroup, I can use this shortcut, which is Ctrl+Shift+G. So, I'll just to double check I'll select them in separate items. Those are now all individually separated. I'm going to show you my favorite use of this command. I'm going to zoom out, select everything, put them into one group, and then do a Copy/Paste with Ctrl+C, Ctrl+V, take that extra copy and move it away, and do a quick rotate, and it rotates exactly 180 degrees. Maybe just scoot it back a bit.
So, what I like about this command is I'm able to share both the front view and the back view of an object, either finished or in progress, and share that with other people. So, grouping is one quick and easy way to organize objects in the scene, but in my opinion, it works best for only short-term operations. Like the example of the quick copy and move we just saw. If I need some geometry to be separated from the rest of the 3D scene, it usually makes more organizational sense to me to put that same bunch of stuff on its own layer.
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