Altering Objects / The STRETCH Command - Crossing Polygon
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Again, we're looking at the Stretch Command but what we're looking at now is a complicated area that might want us to avoid certain objects to be stretched. So we're going to pan and we're going to zoom in on the bottom half of the house here now and what we've got here, you can see we've got a room over here on the left, which is probably our bathroom but over here we've got some door frontages and so on. Now, what I want to do is I want to stretch this end of the house. Now, what I could do there is I could do my normal crossing selection, a rectangular selection like so. I could do that at risk of obviously selecting bits that I don't want to stretch like so as you can see. The only bits I want to stretch are the walls themselves. So I'm going top an upwards a little bit further here so that we've got some room down here to stretch. I'm just going to pan up a little bit more and what we're going to do is we're going to use the crossing polygon selection. Now, what this allows us to do is it actually allows us to do a polygon selection, a multi-sided selection and go around the objects that we want to select. So it's the same process and it's still a crossing window as such. So we go again to the Stretch Command here on the Modify Panel. Click on Stretch and come into the drawing area. At the Select Objects Prompt now we type CP, for crossing polygon and press Enter. It'll ask for our first polygon point. Now, a good hint here is to switch off Polar, O Snap and O Track; therefore you don't snap to any objects because they will get stretched. That's the thing. If they're selected by way of the crossing polygon with a snap, they will also get stretched. So I'm going to start over here on the left and I'm going to left click and I can have as many points on this polygon as I like. Notice the polygon is beginning to take shape. So I can come up and around my doors like that. I don't want them to stretch so I don't cross them. I go around them. I come out now. As you can see, now look. There's the polygon taking shape. I'm going to come out to the right here like so. It looks like it's crossing over itself. It's not. If I pick that point there and move downwards, you can see I'm starting to take the polygon outside the house. So I left click again and I drag all the way across here to the left like that and left click again. There's my polygon. As you can see, multi-sided and going along various different lines. It's not a regular shape. Again though, you press Enter to confirm the polygon this time and then press Enter again. There's two Enters there, unlike the crossing selection where there's only one. So there's an Enter to confirm the polygon and there's a second Enter to confirm the objects. Then you get the prompt for the base point. Then we go down to the Status Bar, switch on Polar, O Snap and O Track again because we're going to need the Polar Tracking and the Object Snap. So we're now going to pick an internal point again like so, I left click and I'm going to drag vertically downwards this time, down to the 70-degree Polar Tracking line. You can see that there on the screen, to 70 degrees and again I want to take it downwards by 2,000. So Direct Distance Entry, type in 2,000, 2000 millimeters or two meters. I press Enter to confirm the distance and my house has now been stretched. Now, you'll notice there the windows and the front doors have moved in the plane of the stretch. It's only the walls that have actually stretched in this instance. Let me show you what I mean. I'll just pan downwards a little bit. I've got a door here in the middle of some walls. If I go to the Stretch Command and just quickly do a crossing selection like so, like that, and press Enter to confirm, if I click on any part of that door, left click and just drag, look. The door moves and the walls stretch. So as long as I'm following my Polar Tracking line downwards like that, I can go in any direction I want. Look. If I go down this way like that, I can type in a distance of let's say 1500 and Enter. The door moves by 1500 and the walls stretch to accommodate. So that's using your crossing polygon and also looking at how the plane of the stretch works.
Tutorial Information
| Course: | Autodesk AutoCAD 2009: Certified Professional |
| Author: | Shaun Bryant |
| SKU: | 33947 |
| ISBN: | 1-935320-14-9 |
| Release Date: | 2008-11-26 |
| Duration: | 4 hrs / 56 lessons |
| Work Files: |
Yes |
| Captions: | Available on CD and Online University |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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