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- Today, I want to talk about Join and Cut Geometry. These are modification tools that allow you to merge together the solids of walls, floors, roofs and create interesting conditions where the geometry connects to one another. So, you can either cut one piece of geometry all the way through the other, or you can merge them together in more of a union sort of situation. I've got some really simple objects here onscreen. Let's take a look at a few scenarios. So, I'm going to start over here, with these two overlapping walls. Now, if I click either one of these walls and look at Show Warnings, the two walls are overlapping, which, generally, we try and avoid, and it's telling us that we can use Cut Geometry to embed one in the other, so that's the first thing I'll show you is the Cut Geometry.
So, if we go to the Modify tab, we've got the Cut tool right here, and it matters what order you pick these in. So, if I pick the big wall first and then the small wall, you can kind of see what happened. Let me just go ahead and select this, hold my Shift key and drag the wheel to spin around. But the smaller wall cuts through the bigger wall. So, if I undo that, and I do it again, then I go to Cut Geometry and I pick the small wall first and then the big wall, the difference is, now, the big wall is cutting through the small one, and really, it just looks like you shortened the wall, so that one isn't, maybe, as interesting as the first one.
But with Cut, it will cut all the way through. So, that's important to understand there. Now, let's contrast that to Join Geometry. So, Join is right below Cut, and again, it matters what order you pick them in. So, if I pick the big wall, and then the small wall, initially, what you're going to see is the same. Regardless of what order you pick them in, you're going to get these nice, resolved edges there. But what happened here if I select the small wall, and I isolate it, and then I spin around, what you're going to see is, the big wall took a notch out of the small wall.
I'm going to reset that. We could either unjoin the geometry, undo, or, there's actually a Switch Join Order that we can use here, so I can just sort of pick these two things and they'll flip, and now the difference is, this wall is the one that remains intact, and if we hide that, we can see that it took a notch out of the big wall this time. So, depending on the order that you pick these things in, you're going to get a slightly different effect, right? So, that's part of the value of using these tools.
What I've got over here is some situations where, maybe, I want to use these techniques to convey different kinds of materiality on these walls. So, I've got this mural on the wall, and I've got this floor pattern down here. The floor, I've already done, so let's just go right to Join or Cut Geometry. You could use either tool here, you'd get basically the same effect, but I'm going to use Join, and, again, it matters what order you pick them in, but a lot of times, I get lazy about that, so I'll just sort of pick them, and if I get an error, then I go, "Oops, I guess I picked them in the wrong order." So, what this is telling me is, is that the smaller one is completely inside the bigger one.
If you click OK here, you wouldn't see anything, right? It would just look like the floor was missing. So, I'm going to undo that, and pick them in the opposite order, here to here, and that's the effect I was looking for. So, again, not a big deal if you accidentally pick them in the wrong order, because it's easy to correct. But now, you can see that I've got these two objects showing different materials through, and just like we saw with the other object, it is literally cutting through that object, and kind of changing its shape a little bit.
I did that by editing the floor sketch, and we're going to do something similar here by editing the wall profile sketch. You can actually edit the shape of walls. They start off as rectangles, but using Edit Profile, you can change that shape. That's what we're going to do here. To get started, in the file, I've created just some really simple wall types. So, I've got this big, blue wall here, which is 24 inches thick, and it's got this blue paint on it, and you can see that right there, if you do Edit Structure. So, I'll just cancel out of there. And then, I've drawn these model lines on the surface of that wall, just to make the sketching a little bit easier, and that represents that sort of mural there.
So, I'm going to select the wall, and I'm going to copy it and paste it right on top of itself, which is normally considered a bad idea, and again, it's telling me you can use Cut Geometry. Interestingly, though, it doesn't say anything about Join Geometry, which is what we're going to rely on here. I want to make a couple modifications to this pasted wall. Notice, it's still selected. The first is, I'm going to change the location line to Finish Face Exterior, and that pulls those grips forward to the front surface, which is what I want, because I want these two walls to stay flush with one another.
Then, I'm going to go to the type selector here and chose one of my other wall types that I already have in this file. So, I've got several generic walls of different colors. So, I'm going to chose the generic five inch green wall. Now, you can kind of see that it's a thinner wall now, and it's using this green paint. Now, we can't really see the green paint yet, until we're done. So, now we're going to go to this button here on the ribbon, which is Edit Profile, and this is what I was just talking about. This is what's going to allow us to change the shape of the sketch. So, I'm going to take the sidelines here, click them, use the grip and stretch that down until it snaps to the endpoint of those curves I drew on the surface.
I'll take this line here and delete it, and then I'll use Pick Lines and just sort of pick right on these model lines to trace those curves. And when you click finish here, that actually creates a little, short wall now, and if we go to Temporary Hide, Isolate and isolate that element, you can see that we've got this little, short green wall now. So, the next step is to just merge that into the big blue wall, using Join Geometry. Now, it might be difficult to select the faces of these things in 3D.
So, what I recommend that you do is, on your selection dropdown here, make sure you've turned on Select Elements by Face, and you can also do that down here, with this little icon in the lower right hand corner. So, whichever one you want to do. So, I'm going to pick the green wall, and then the big blue wall, and that will merge it in to that geometry, and as we've seen now, on a variety of times, if we hide that, it's literally cutting itself into the the thickness of that blue wall. So, let's repeat that, by selecting the green wall here, copying it, pasting it to the same place.
Go right to Edit Profile, take these vertical lines, stretch them up until they snap to the diagonal lines representing those mountains there, delete this line at the bottom, use Pick Lines to grab the shape of the mountains, and then click Finish to finish creating that wall, and then, I don't want it to be green, so I'm going to change it to this purple color, and then, finally, do Join Geometry, pick the purple mountains, and then the blue wall, and that merges that in. So, we've got one more to do.
Select the purple, copy it, paste it to the same place, Edit Profile, don't need the curves anymore, don't need these little straight lines, do Pick Lines to pick these curves now, and then trim and extend to a corner to clean it up. So, I'll click Finish. This time, just for a little bit of variety, let's use Cut Geometry. Now, you may recall, with Join Geometry, it only joins in and kind of merges together, but with cut, it's going to cut all the way through.
So, if I go to Cut Geometry, and I select the big wall and then the small wall, you'll see it kind of merged in. Now, it's still using that purple color, so let's change it to this white one. Okay, so that looks a little bit better. And, if we spin this around, you can see that that wall has cut all the way through. So, the interesting thing about using Cut here is, we can take that white curve there, and just go to our Move command, pick a point, and I'm just going to move it straight back, maybe about one foot, and that just kind of introduces some depth, now, into that surface of that wall, maybe makes it slightly more interesting.
Now, at this point, we don't need the model lines anymore, so I'm going to make a selection here, make sure that I've only got model lines, and then, you can either delete them, or in this case, I'm just going to hide them, just in case, and that gets rid of those. Now, the last thing I want you to see here is that you can actually put doors or windows into this assembly now, and it will cut all the way through all of the merged geometry. So, if we go to Architecture and Door, and kind of place a door there, you see how that door is actually cutting through both walls? And it does cut all the way through and creates a proper opening.
Now, we could do the same thing over here. So, if I place one in this wall, and just sort of move it over a little bit, notice that that's actually cutting through both of the joined walls. So, that's another nice benefit of using these Cut and Join tools. Cut and Join Geometry are useful tools to help you create more complex geometrical conditions. It's great for creating sort of these more robust forms or just for simply rendering different materials on the same surface.
NOTE: The exercise files for this course can only be opened in the most recent version of Revit (Revit 2017).
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