Once you have the basic geometry like walls, floors, and roofs in place in your model, you'll begin the steady process of refining the model as the design progresses. In many cases, you will find the need to cut holes in these elements like simple passageways through walls, shafts for floors, elevators and equipment in floors and skylights and dormers in roofs. In some cases, you'll find it easiest to edit the sketch of the element in question to represent such penetration. This approach would work well for floors which represent double volume spaces for example. In other cases, you might use an opening object to actually cut through the solid geometry.

Once you have the basic geometry like walls, floors, and roofs in place in your model, you'll begin the steady process of refining the model as the design progresses. In many cases, you will find the need to cut holes in these elements like simple passageways through walls, shafts for floors, elevators and equipment in floors and skylights and dormers in roofs. In some cases, you'll find it easiest to edit the sketch of the element in question to represent such penetration. This approach would work well for floors which represent double volume spaces for example. In other cases, you might use an opening object to actually cut through the solid geometry.

So in this movie, we're going to explore a few examples of opening objects, and I'm going to start with a shaft opening, and the file I have opened here on screen is called Shaft. Now the opening objects are on the Architecture tab. You can find them here on the Opening panel. We're not going to do all five opening types, but we are going to look at a couple of these. And again, I'm going to start with the shaft opening. Now let me set the stage here first. I'm in a view called Section 2 here and this section is cutting through the elevator shaft of my building.

Let's just get a closer look here. Let me zoom in a little bit on a couple of these floors here. What you'll see is the floor slab here goes all the way through on each level. Clearly, that would make it a little difficult for our elevator cab to travel through there. Our two options for dealing with that would be to select the floor, go to Edit Boundary. Because I'm not in a Floor Plan view, Revit would alert me of that fact, and ask me for a floor plan that I wanted to open up like Level 2.

And then, in that floor plan, I would have to draw the shape of the hole that I wanted to cut through that space, and I could do that with a simple rectangle for example. I'll just answer No for that question. When I finish that and I go back to the section, that would in fact cut the hole in there, but the trouble is that only worked for the one floor that I had selected. So what I'm going to do here is reverse all of that with my Undo command and I'm going to instead use a shaft opening.

The advantage that the shaft opening has is it's a separate sketch-based object that we draw it once and then we adjust the height of it, and it will cut through every object in its path. So let's go to the First Floor Plan here to get started, Level 1, and I'm going to zoom in on the elevator area. And I want to create the shaft in that area right there, so I'll click Shaft. That takes me to Sketch mode, we've talked about Sketch mode quite a bit already.

I can really draw this thing using any of the methods, I could use Pick Walls or just draw a rectangle. In this case, I'm going to just draw a simple rectangle and I'm going to start right here at the intersection of those two walls, and go over here to the intersection of these two walls. Now with these lock icons, I can even lock this sketch, and the advantage of that will be if any of those walls move, this sketch will actually adjust. The potential disadvantage of doing that is if one of those walls moves in such a way that the sketch can't stay attached, it might generate an error message.

So just be careful about locking your sketches, but in this case, I'll go ahead and do it. I'm going to click Finish here. And to see the result of that, I need to go back to the Section view, I'll go to Section 2 here. And interestingly enough, the shaft actually ended up sort of in the middle of the space there. Either using the settings here on the Properties palette, the level constraints and heights or these little grips, I can make adjustments to that height. So what I'm going to do is make the Base Constraint start at Level 1.

Let's apply that and see what that does, you see how that will pull it down there, and then the top constraint here is already up to Level 3. That seems to do the trick. If I deselect the shaft, you can see the result. We now have a nice clean space through here, the walls pass through cleanly, and the elevator can pass through that shaft there. So the shaft opening is void opening and it cuts through everything in its path. I'd like to look at another example. I'd like to look at the dormer example.

It is a similar kind of thing. So I've got another file open here in the background called Dormer. It's just a really simple little building here. I've got a hip roof, and then I've got a small little gable roof here, and then these three little walls right here which make up the dormer assembly. So the first step of creating a dormer is to just build the actual geometry that will represent the dormer. What I want to do now is actually create a hole. I'm going to select all of this stuff and temporarily hide it with my sunglass icon down here.

And you can see that there's no hole in the roof beyond. So let me reset the Temporary Hide/ Isolate and so that's going to be what this dormer opening tool is going to do for me. It is going to allow me to build that hole in the other roof. Now the first step is, this roof is not touching the back roof. So I want to join these two together. There's a tool for that. I'll go to the Modify Tab, and I click on the Join/Unjoin Roof tool. It's prompting me to select an edge at the end of the roof.

I can pick either one of these, and then the plane I want to attach it to, and it will just extend that roof back and attach it. Then I go to the Architecture Tab and I can create my dormer opening. So I'm going to click the tool and the first question that it's asking me is to select the roof that's going to be cut by this opening, and it's going to be this roof. Now that will take me into a kind of Sketch mode, and this is similar to other objects we've seen that it has this Pick option right here. I can pick the edges of roofs and walls.

So if I pick this roof, it draws that little V-shape. And if I pick these walls, you can see that it will create those little sketch shapes over here. Now if I zoom in slightly, this sketch line went to the inside face of the other wall there. So I'm going to click my Modify tool to cancel out of that mode, select this, and I'm just going to flip it to the other side, and then I'll use my Trim command to trim up these corners. So like other sketches, this has to be an enclosed shape.

When I click Finish, I'll get this error message. Now this can be a little scary looking message here, everything turned orange on screen, and it says it can't continue. But, what it's actually talking about is not really the dormer at all, what it's talking about is the wall out here, the exterior wall that's attached to the underside of the roof. The remedy is listed right here. I can unjoin the elements. I'm going to go ahead and do that. Now you could see the dormer is nice and clean, it's all done. If I select these elements here with the window selection like we did a few moments ago, and I do Hide Element, you can see we've got our nice little hole cut through the roof there. Let me reset that.

Where the trouble is, if I open up a section that cuts through this dormer, I'm going to open up Section 2, you could see the dormer condition over here. Let's zoom in on it. This was really where the problem was. So the wall up here is kind of in the same general location as this wall over here. So you could either join those walls together or what I'm going to actually do in here is I'm going to tab into this wall and select it, and I'm just going to use the temporary dimension here to make that about 3 foot 9.

That will pull that wall back slightly and then I can select this wall and reattach it to the underside of the roof, and it kind of takes care of the problem. If you want to, you could adjust the overhang of the roof, and so on. So there's a couple of quick examples of a few of the opening objects we have; a shaft opening will cut through any horizontal slab or roof that it finds in it path. You can adjust the heights in order to have its effect be more broad. A dormer opening is a very specific kind of opening specifically for cutting dormers into roof slabs and I encourage you to explore some of these other openings on your own.

We've got simple vertical openings and wall openings, they all kind of work the same way. They're a void object that intersects with the solid object and cuts the form away. But, the really nice thing about these void objects is because they're separate objects, you can modify them later, and they will reapply themselves automatically to the surrounding geometry.

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#### This video is part of

Revit Architecture 2013 Essential Training

96 video lessons · 12631 viewers

Author

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1. ### Introduction

1m 57s
1. Welcome
1m 2s
2. Using the exercise files
55s
2. ### 1. Core Concepts

14m 43s
1. Introducing building information modeling (BIM)
3m 0s
2. Working in one model with many views
4m 48s
3. Understanding Revit element hierarchy
6m 55s
3. ### 2. Getting Comfortable with the Revit Environment

54m 44s
1. Understanding the different versions of Revit
1m 19s
2. Exploring the Recent Files window and the application menu
5m 20s
7m 12s
4. Understanding context ribbons
4m 43s
5. Using the Properties palette
8m 31s
6. Using the Project Browser
5m 34s
7. Navigating views: Zooming, panning, and rotating
5m 57s
8. The basics of selecting and modifying
9m 49s
9. Accessing Revit options
6m 19s
4. ### 3. Starting a Project

47m 6s
1. Creating a new project from a template
7m 42s
2. Accessing a multi-user project with worksharing
4m 16s
3. Configuring project settings
6m 33s
7m 40s
6m 23s
6. Refining a layout with temporary dimensions
6m 58s
7m 34s
5. ### 4. Modeling Basics

1h 11m
8m 48s
2. Using snaps
6m 24s
3. Exploring wall properties and types
7m 37s
4. Locating walls
7m 27s
5. Using the modify tools
9m 32s
7m 39s
7. Using constraints
8m 27s
8. Adding plumbing fixtures and other components
8m 39s
9. Using Autodesk Seek
4m 19s
10. Using wall joins
3m 0s
6. ### 5. Links, Imports, and Groups

1h 11m
10m 59s
2. Creating topography from a DWG link
7m 43s
7m 56s
4. Import tips
6m 49s
5. Creating a group
7m 10s
6. Mirroring groups to create a layout
5m 3s
5m 16s
8. Rotating and aligning a Revit link
7m 6s
9. Establishing shared coordinates
6m 5s
6m 0s
11. Understanding file formats
59s
7. ### 6. Sketch-Based Modeling Components

1h 13m
1. Working with floors
8m 57s
2. Working with footprint roofs
6m 22s
3. Working with extrusion roofs
4m 59s
4. Attaching walls to roofs
3m 17s
5. Using the shape editing tools to create a flat roof
6m 33s
6. Working with slope arrows
6m 0s
8m 33s
8. Working with stairs
8m 4s
3m 40s
10. Working with ceilings
9m 36s
7m 20s
8. ### 7. Complex Walls

48m 34s
1. Creating a custom basic wall type
10m 18s
2. Understanding stacked walls
8m 12s
8m 17s
4. Adding curtain grids, mullions, and panels
10m 59s
5. Creating wall sweeps and reveals
6m 26s
6. Exploring model lines
4m 22s
9. ### 8. Visibility and Graphic Controls

47m 40s
1. Using object styles
4m 19s
2. Working with visibility and graphic overrides
7m 3s
3. Using view templates
6m 13s
4. Hiding and isolating objects in a model
6m 37s
5. Understanding view range
7m 7s
6. Displaying objects above and below in plan views
6m 35s
7. Using the Linework tool
5m 21s
8. Using cutaway views
4m 25s
10. ### 9. Rooms

21m 28s
8m 15s
2. Controlling room numbering
6m 13s
3. Understanding room bounding elements
7m 0s
11. ### 10. Schedules and Tags

33m 13s
1. Understanding tags
9m 58s
7m 55s
3. Modifying schedule views
7m 12s
4. Creating a key schedule
8m 8s
12. ### 11. Annotation and Details

58m 40s
7m 29s
9m 6s
4m 42s
4m 51s
5. Creating a detail callout
8m 31s
8m 52s
7. Using arrays to duplicate objects parametrically
7m 43s
7m 26s
13. ### 12. The Basics of Families

41m 29s
1. Understanding families
2m 37s
2. Creating a new family from a template
6m 29s
3. Using reference planes, parameters, and constraints
7m 52s
8m 40s
5. Cutting holes using void geometry
5m 9s
6m 2s
7. Completing the family
4m 40s
14. ### 13. Sheets, Plotting, and Publishing

38m 48s
7m 44s
2. Working with placeholder sheets
5m 24s
3. Aligning views with a guide grid
5m 57s
4. Outputting sheets to a DWF file
6m 39s
5m 42s
6. Plotting and creating a PDF
7m 22s
15. ### Conclusion

2m 38s
1. Next steps
2m 38s

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