The theme of the movies in this chapter will be sketch-based objects. What I mean by sketch-based objects, is any object in Revit that you have to create a two-dimensional sketch in order to indicate the shape or overall form of the object. There are certain objects that Revit can automatically assume the shape or the form for you. When you draw walls or doors or windows you really only need a click or two and Revit can do the rest, but when you want to draw elements like floors or roofs or stairs and railings, these objects require a little bit more input from you in terms of what the shape and form of that overall object is.
So in this movie, we're going to look at floors as our first example of a sketch-based object and I'm in a file here called Adding Floors. So on the Architecture tab we'll find the Floor tool over here, I'm going to simply click on that. If you use the dropdown portion, make sure you're choosing Floor Architectural for this example. I'm just going to click the button here, that's actually the default Floor button, and this takes me into Sketch mode, this mode that I'm talking about here. Now I know I'm in Sketch mode because a few things happen on screen. The drawing window grays out and kind of becomes like an underlay.
The Ribbon tab tints in this greenish color and right here on the ribbon we get this Mode panel with these two big buttons, we get the big red X and the big green check box. Those buttons are important, because those are the only ways out of Sketch mode. So if you change your mind about being in Sketch mode, you use the big red X and that cancels the command. If you want to complete your sketch, you use the big green check box and that finishes your command. There is no other way to get out of here, you can't press Escape, you can't click the Modify tool, those are the two tools you use.
So as a general rule of thumb, stay on the Modify tab when you're working in Sketch mode, because if you click on one of the other tabs here, you'll see those buttons aren't available and you kind of get lost and you're not really sure what to do next. So make sure you stay over here on the Modify tab, everything you need to do in a sketch is going to be right here on this tab. Now usually it starts with the Draw panel over here and the various tools that are available to us. With the Floor object we can draw Boundary Lines, Slope Arrows or we can change the Span Direction.
Boundary Line is the default that's already chosen for us, so I'm going to keep that selected. Over here we can draw any shape we like; lines, rectangles, circles. There's a default selection here Pick Walls, we're going to stick with that. This is a really handy tool because it allows us to just click on the underlying walls in the background drawing area and it will create sketch lines that match the shape of those walls. It can be really helpful. Now on the Options Bar we have one other really helpful setting, Extend into wall core.
Now that's only available if you choose Pick Walls, if we had line or rectangle or any of the other shapes, that check box goes away. But when I have Pick Walls, this Extend into cores here and here's how that works. If I click on the wall you'll see that I get a sketch line, that sketch line matches the overall extent to the wall. Let me zoom in and take a look at where that sketch line occurred. Now I'm going to click my Modify tool here to cancel out of the command so that I can actually select the sketch line.
You see that, that sketch line is right there on the edge of the interior line in the wall. That interior line is the face of the core. Now if I slide this over just a little bit, I'm holding in my wheel and dragging. There is a Flip Grip right here, if I click that, that will actually flip to the other side of the core, but if I zoom in just a touch more, you can see that it is actually the other side of the core. The dry wall line which is this gray line here still occurs a little bit further away from that.
So when you've got the Extend into wall core, that's what you're doing, is you're either on the inside face or the outside face of the core. Now I'm going to zoom back out and continue adding sketch lines here, so I'll go back to the Pick Walls option and I'm going to make sure I'm clicking exterior walls, I mean you can click interior walls too, but in this case that's not what I want. Keep going around like so. This front wall is actually in two pieces, so I'm only to pick one of those pieces there, I don't need to click both, you could click both but my preference is to have a cleaner sketch where I have a single line going across. So I'm going to use my Trim/Extend to Corner command, we looked at that when we were drawing walls in an earlier movie, and I'm going to click these two sketch lines here and clean them up to a corner.
One of the rules of a sketch is, the sketch has to be enclosed, you won't get a valid floor object if the sketch is not enclosed. So I'll come up here and I'll click my green check box, my Finish Edit mode, and that will complete the floor object. Now I'm getting a message here from Revit, it says would you like the walls that go up to this floor's level to attach to the bottom? We're going to cut a section in a few minutes to look at what it's really talking about here, but what it's saying is the walls underneath this floor, do I want those to come up and attach to this floor? Now in this case I'm actually going to answer No here, because the walls that it's talking about are around the perimeter of the building, they are foundation walls and that's not really the result that I want.
But we'll say Yes to that question in the next floor that we draw and you'll see we'll be able to contrast the two behaviors. Okay now the floor remains selected, and of course, if I wanted to I could make modifications to it. Now to do a modification you could actually use this Edit Boundary button right here, that would take you back into the sketch and then you could make any changes that you wanted to. If I change my mind about the shape of this floor and I want to make it some other shape, in this case I'm just going to cancel though and discard those changes. So let's go up to Level 2 and let's add a second floor object here on the second floor.
So I'm going to go back to the Architecture tab, click the Floor button again. All the same defaults apply, so I'm going to accept all of those, and I'm going to pick these exterior walls right there, but then I'm going to stop and go to my Trim tool, because in this area here I have a double volume space, so that's open to below, so I'm just going to trim this to this to make it a nice corner and so I'll get an edge over here. However, if we zoom in, in this little area here, that would make it a little difficult for this stair to take us up to that floor area, so we need to create a little extension over here and I'm going to do that by just drawing the shape that I want.
So here's an example where Pick Walls wouldn't really help me, so I'll just draw a line here, draw another line there, and then I'll just trim it up. This one to this one, remember to pick the lines you want to keep, if I undo that and I do this, I don't get the result I want. So you pick here and then this is the side I want to keep, so remember to do that, and then this one to this one, that makes a nice corner there and there. I click Finish. I'm going to get that same question again, and this time I'm going to say Yes, and then it asked me a second question.
Here you could see it's highlighting the exterior walls here, so I'm going to say Yes again, and now I'm going to cut a section and I'm going to show you what all of that did. So I'm going to zoom out here a little bit and up here on my Quick Access Toolbar, I have my Section button, so I'll go ahead and click that and I'll just draw a section through this area right here. Now you can see that when you draw a section it's just two clicks, this dashed box is telling you which part of the building will be included in the Section. We're to be standing here at this line looking this way and if I deselect it and just double-click on there, it will open up that section.
Now let's go ahead and zoom in on these two floors that we just created. The first question said do you want the walls that go up to this floor's level to attach to the bottom? They were talking about these walls right here, so you can see that this wall is attached to the underside of this floor. Over here the second question asked, do we want the Floor object to join geometry and connect to the exterior walls? Now we said No to the question when we did the first floor slab, because what it would have done is, like here where it cut these walls down to attach to this floor, it would have done the same thing with these foundation walls and we'd have a funny little notch here.
Now if I don't like that condition right there, I can manually clean that up by going to Modify, clicking Join Geometry and I go this object should join to that object and it will clean that up for me. So to create Floor slabs in your model, say sketch-based object, sketch-based object objects are generated from two -dimensional sketches, in this case drawn in a floor plan. You can generate that sketch from the surrounding walls or you can draw it line by line. When you complete the sketch, Revit will create the 3D geometry that's needed for your floor slab.
- Introducing building information modeling (BIM)
- Adding levels, grids, and columns to set up a project
- Creating building layouts with walls, doors, and windows
- Modifying wall types and properties
- Working with DWG files and CAD inserts
- Adding rooms
- Adding curtain grids, mullions, and panels
- Using cutaway views
- Generating schedules and tags
- Adding callouts such as text and symbols
- Understanding families
- Outputting files, including DWF and PDF files