Join Paul F. Aubin for an in-depth discussion in this video Wall properties and types, part of Revit 2018: Essential Training for Architecture (Imperial).
- [Voiceover] When working with a program like Revit, precision is very important. So there's going to be lots of ways that we can ensure that we get precision with the models that we create. And in this movie, I'd like to talk about snapping behavior. Now, snapping behavior just simply refers to the softwares anticipating the increment or the geometrical locations that you want your cursor to jump to. So we have really two kinds of snap behavior. We have increment snapping, where the snapping of your cursor is going to be tied to a distance, and then we have object snap behavior, where it will actually snap to key geometric points on those objects.
Like end points, or mid points, or intersections. So let's look at both types of snaps here in this file. This is just an empty file that I created from the default template, just for us to have a place to work. Now, I'm gonna start the wall command, but in order for me to demonstrate the first snap, I actually need to zoom out a little bit. So, you can do that over here on the floating toolbar here, using any of these zoom commands. There's one here called zoom out 2x. Now the way this little toolbar works is if it's already checked, and you pick it off the menu, nothing happens.
So if you want to run it again, you just click the icon there, and it will run it again. If you choose it from the menu the first time, then it will run the command that first time, but then after that you'd have to click the icon. So it's zoom out 2x, or I could type ZO as the keyboard shortcut. And that's gonna zoom me out far enough away for you to see the first snapping behavior. And the way that's gonna work is I'm gonna click any start point. Now, wherever you click, Revit's just going to label that as zero, okay? That's just the arbitrary start point.
But watch what happens when I slowly start to move my mouse. Notice that it's not moving fluidly, it's actually jumping in a fixed increment. And that fixed increment is every four feet. Now if I were to click a point, that wall that I just created is exactly 40 feet long. If I go in another direction, that one is exactly 20 feet long. And in fact, it works in any angle, so if I go off at an angle, this one is exactly 76 feet long.
So you can trust those values, they are precise, but it's just snapping to those automatically. Now, if I stay in the command and I zoom in, at some point, that snap increment is going to change and become a little bit more refined. So I don't know if you've noticed, but it's no longer snapping to every four feet, it's now snapping to every six inches. And it's subtle, you have to look carefully at it, if I zoom in a little closer you can see it better. But at some point, if I continue to zoom, it will no longer be every six inches, it will be every one inch.
And then if I zoomed in even further. And this, I'd have to zoom in quite far. And I'm just using my wheel for this. Notice that it's now every quarter of an inch. And again, if I click, that is one foot eight and a quarter inches. It is precise. Now, what I like most about this feature is just the simple act of zooming changes how precise the snapping behavior is. Now let me cancel all the way out of the command, I'll use my modify tool, and let me show you where the length increment snaps are configured. Let me do ZF to zoom to fit.
And then go to the manage tab, and I'm gonna click the snaps button. Here at the top, you have your length dimension snap increments. And you can see four feet, and then a semicolon, and then six inches, and a semicolon, the semicolons seperate each of the steps. Now you could come over here and put in a new increment, if you wanted to. So if I type two and click okay, first of all, you don't have to even type it in order. 'Cause when I go back to snaps, notice that it moved two over here to the appropriate location.
And now what will happen is, if i go back and I start drawing a wall, it'll first snap to every four feet, and then at some point, you can see the zoom level I'm currently at, it actually can see the two foot increments, so I'm really getting every two feet right now, if I zoomed out far enough, it would jump to only every four feet. But also notice, that regardless of what level of zoom you're at, Revit is always trying to line up with existing geometry. And when you do, it will snap to it wherever it is, down to the 256th of an inch.
It's exceedingly precise. And if I were to click right now, the length of that line is whatever it needed to be to line up perfectly with that object. So that's another kind of a snap that's always on, it's always trying to align with other geometry. Now, while you're drawing, sometimes you want to snap to something that already exists, like maybe the end point of that line. An end point is indicated by the small square. Or perhaps the midpoint of this wall. And that's indicated by the small triangle.
Or, perhaps the intersection here between these objects, and that's indicated by the small X. So to see the settings for that behavior, you also go to the manage tab and click the snaps button, and here in the middle of the screen you see the object snaps. You've got your end points, mid points, intersections, centers, and you can actually uncheck any of them that you don't want to use, but by default they're all turned on, and I think in most cases that's a pretty good idea. The other thing I wanna point out to you is these letters in parentheses over here.
Those are the keyboard shortcuts for these snap commands. So if I want to force Revit to snap to an end point, I can do it even though it would rather do a midpoint. The way that I do that is type SE. And now it forces it to an end point. And then I'm drawing, and even though it wants an end point, I could do SM, and now it would want a midpoint. And as I move around, it can find the midpoint of anything just by moving the mouse, but it will only look for midpoints.
So as you practice with these, and get familiar with the different snap options, you'll find that it's pretty easy to remember them, especially the keyboard shortcuts, because they all begin with the letter S, but I do encourage you to experiment a little bit with the snapping behavior, both the increment snaps and the object snaps, because they will become second nature very quickly, and as you're doing layout tasks, you'll be taking advantage of this snapping behavior all the time.
First, get comfortable with the Revit environment, and learn to set up a project and add the grids, levels, and dimensions that will anchor your design. Then author Paul F. Aubin helps you dive into modeling: adding walls, doors, and windows; using joins and constraints; creating and mirroring groups; linking to external assets and DWG files; and modeling floors, roofs, and ceilings.
Paul also shows advanced techniques for modeling stairs and complex walls, adding rooms, and creating schedules. Finally, discover how to annotate your drawings so all the components are clearly understood, and learn how to output sheets to DWF, PDF, or AutoCAD.
- Understanding BIM and the Revit element hierarchy
- Navigating views
- Creating a new project from a template
- Adding walls, doors, and windows
- Adding plumbing fixtures and other components
- Linking AutoCAD DWG files
- Rotating and aligning Revit links
- Working with footprint and extrusion roofs
- Adding openings
- Adding railings and extensions to stairs
- Creating stacked and curtain walls
- Hiding and isolating objects
- Adding rooms
- Creating schedule views and tags
- Adding text and dimensions
- Creating new families
- Using reference planes, parameters, and constraints
- Plotting and creating a PDF