Join Shaun Bryant for an in-depth discussion in this video Creating a region from 2D objects, part of AutoCAD: Tips & Tricks.
- [Narrator] We're now in another AutoCAD tip and trick from Lynda.com. We're going to start looking, now, at moving from 2D drafting into 3D drafting. And one of the commands that you can utilize for that is the REGION command. So, we got a whole new drawing for you here. You can download that from your Lynda.com Exercise Files, as usual, to follow along with the video. And what we're going to look at is converting a group of 2D objects into what they call a region.
And then, a region can be utilized in a 3D environment to develop 3D solids that you might want to use in a 3D model. So, in this particular 2D drawing, you can see that we've got various objects. Got a rectangle, rectangle, and some circles there. And what we're going to do is we're going to create regions from all of them, and then use a particular 3D solids editing command called Union to join them all together and form one region, which we can then use to convert into a 3D solid at a later date.
So, how do we use this REGION command? Well, it's very, very easy. You can just type it, if you want to, and type the word region. Before we do that, though, we're going to have a look at our layers first, in the home tab on the ribbon. So, if I go to Layers, you'll see that we've got an Objects layer and a Region layer. So, what we're going to do is we're going to put the region onto the region layer, once it's been created. So, we'll do that in a moment. So, let's go and find the REGION command. Now, you can find it on the home tab, on the draw panel here, and I'll just pin that open quickly.
And region is just there, there's the REGION command there. And as you can see, it converts an object that encloses an area into what they call a region object. And it's a two-dimensional area that you create from closed shapes or loops. And you can combine several regions into a single, complex region. That's what we're going to do using the UNION command in a moment. And then, what you can do with that region is put it into a 3D environment, use commands like Extrude, and so on, and actually generate a 3D solid.
So, let's look at creating our region first. I'll click on the region command, come into the drawing area, and it prompts me to select the objects. Now, I'm going to select everything. I'm just going to click there, put a crossing selection all the way across all of the objects, like that, and just press enter. Now, it doesn't actually look any different. But look at the command line. 11 loops extracted, 11 Regions created. So, if I hover over any of these circles now, tells me it's a region, it's not a circle.
That rectangle there is a region, it's not a circle. So, what we're going to do now is we're now going to use the UNION command, which is a 3D solids editing command, to convert all of these in a Union, all of those regions together. Now, you wouldn't be able to use this UNION command if they weren't regions. If they were circles and rectangles, it wouldn't work. You have to convert all of the circles and the rectangles, which have to be closed loops, to regions first. So, I now just type union, like so. There's the UNION command there.
And I just select that from the suggestion menu. And it says select objects. Now, you might get one of these funny, little pop-up menus come up here, on the help screen. It's telling you how to combine 3D objects into surfaces and things. Just ignore that for now. So, if I click here and do the same crossing selection on my regions, watch what happens when I press the enter key. It's now unioned all of those regions together to form the one region. And there's my one region, created on the objects layer.
So, I just need to select that now, go up to my Layers panel, click on the little pull-down, and put that on the Region layer to make sure that it's a region and not an object anymore. And that's how quick and easy it is to convert a group of 2D objects into a region ready to be used in a 3D drafting environment.
Skill Level Intermediate
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