Subtitles of the Movie

OK, so now we've worked with the World UCS, we've looked at Origin UCS, and we've Named our UCS's as well. Now what happens now if we want to Rotate a UCS? We might want to rotate it to a specific direction, or specific angle. Now that all depends on what we're doing in our drawing, but obviously if you're working in your drawing you've got Named UCS's to work with anyway, but it may be that you just need to rotate a UCS to a known object, just to do a quick piece of editing work and then go back to the World UCS. Let's have a look now at doing that with the corner of our Summerhouse here. Now, I'm looking at this corner here, not the other corner where we placed the Named UCS. Now what I'm going to do, I'm going to go to Origin UCS here and click on this point here. Now all I'm going to do now is it says: Specify a point on the X axis; I'm just going to press Enter this time to accept. I'm not going to pick a point, and as you can see that is sitting there horizontally and vertically just with the Origin at that particular corner of the Summerhouse. What happens now if I want to Rotate it? Now what you've got to think about here is we're working in 2D, so we're only going to be able to Rotate about that point where the X and Y axis intersect. Now if you think about it, if you imagine an axis coming out of the drawing at you, that is your Zed axis, so you can rotate this X and Y about your Zed axis. One of the best ways to think about this is, if you take your right hand and clench your fist and then put your thumb out in a thumbs-up sort of gesture imagine your fingers are wrapped around the axis. So if you imagine your fingers are wrapped around that Zed axis, yeah, coming out of the page at you, your thumb will be pointing toward you. That indicates the positive direction of the Zed axis. If you put your hands around the X axis and cup the X axis and bring your fingers up and around it, your thumb should be pointing to the right indicating that your X axis to the right is positive. If you take your fingers and cup them around the Y axis your thumb should be pointing upward indicating that upward is the direction for the positive Y axis. OK, theory over. Let's have a look now at Rotating about the Zed axis with this UCS. So, our UCS is sitting there at the moment. We go to our View tab in the Ribbon and our Coordinates Panel and you'll see that we've got three Icons: X, Y, and Zed. You can rotate in any of the three directions. We want Zed, so we're going to rotate the User Coordinate System about the Zed axis. So we click on Zed there and we come into the Drawing Area. That prompts you to specify a Rotation Angle about the Zed axis. What I'm going to do is pick two points. I'm going to pick a point here and then come up to this Midpoint, just there, and left-click, and lo and behold, it rotates about the Zed axis in the direction I've specified. Can you see there? The Origin has been maintained because that was the first point I selected. The second point I selected was a point along the X axis to rotate about the Zed axis, so you can see that my X is not pointing in this direction, that way, and my Y is pointing in that direction. So if I was measuring coordinates now, positive is in this direction for X, and Y it's in this direction. It all depends on what you're drawing in and what your environment is in which you're drawing. But as you can see there I've been able to rotate my UCS Icon albeit that it was set to World Coordinates anyway, X and Y, I've rotated that about the Zed axis and I've placed it in line with, again, an object, similar to doing Origin and UCS like before.