Join Paul F. Aubin for an in-depth discussion in this video Creating groups, part of Revit 2018: Essential Training for Architecture (Imperial).
- [Instructor] In this video I'm going to talk about creating and using groups. Now, groups are collections of elements within your model that you've gathered together into a single unit and given a name. The purpose of a group is that you can place several instances through out a project and if you change any one of those instances, the changes will be reflected in all instances throughout the project. It becomes a great way to manage any repetitive design element within a project. So, for the example we have here on screen, I have this two-bedroom condominium unit, and if I wanted to repeat this apartment unit several places throughout the building by grouping it, first, I maintain the ability to be able to make changes to just one instance and to see those changes propagated to all instances of the two bedroom unit.
It just becomes an easier way to manage that design condition. Let's go ahead and create a group from the geometry we have here onscreen and then we'll talk about some of its features. What I want to do is select everything on screen, so do a crossing window and make sure you're completely surrounding the entire floor plan. And then on the ribbon, we will find the Create Group button. The keyboard shortcut for that is G, P. Now when I click that, you're going to see that it actually displays the Create Model Group and Attach Detail Group dialog.
It's actually going to create two groups. The reason for that is that if we think back to one of the earlier videos where we talked about the hierarchy of elements in Revit, we discussed how there were different kinds of categories of information in Revit. We had model categories, data and view categories, and we had view-specific categories. Well, Revit understands the difference between the different categories at the fundamental level. So in this case, because we've selected elements of both kinds, it can't put both of them in the same kind of group. A model group can only contain model geometry, and a detail group can only contain view-specific geometry.
So what we're going to do get in this case is a model group that I'm going to call two bedroom unit. That will contain the walls, the doors, the appliances, the floors. Then we're going to get a second group that contains just the detail elements, which in this case is the room tags, the door tags, the window tags. I'll just call them this one Tags. When I click okay, I now get two group elements. Now what I'm going to do is click off to the side to deselect, and move my mouse back nearby and notice that when it gets near the model group, it will highlight and show a dashed box all the way around.
If you click, notice it's only selecting the model geometry. Now if I move near one of the tags, like this window tag, notice that that highlights a separate dashed box and that says that that's an attached detail group. If I click to select it, it will deselect the model group and select the detail group instead. There'll be the presence of this little paper clip icon to let you know that it's an attached detail group. Now the other place where you can see the groups is on the project browser, so if we scroll down in the project browser, and look at the bottom you'll see a groups category, then there'll be a model category.
If I expand both of those, you'll see your two bedroom unit. You can actually expand the two bedroom unit one step further and indented beneath it, you will see floor plan tags. That's Revit's way of showing you that there's a hierarchy there, and that the model group two bedroom unit has an attached detail group for floor plans called Tags. What we can do is select the two bedroom unit and either right-click and choose Create Instance, or we can simply drag and drop that two bedroom unit into the model canvas.
Now when I do that, let me zoom out slightly. Notice that the insertion point of this group is actually right in the middle of the group. I'll click to place an instance. Now I'm going to click the Modify tool and cancel out of there. I'll select either instance of the model group. If you don't like the insertion point being right there in the center, notice that there's a little icon right here that is labeled X and Y. If you grab the intersection of that icon and begin to drag it you can move that insertion point anywhere you like.
I'm going to drag it over here to the end point of this exterior wall. That might be a nicer place to use for the insertion point. Notice that if I select this instance of the group, it's changed there as well. Any change you make to one instance applies immediately to all other instances. Let me pan this over a little bit, right-click this group, create an instance just to show you the alternative way to do it. Notice now that it's using that new insertion point. I'll click to place an instance over there.
Now I have three instances of the model group. So what is it about a model group, what can we do with it? Let's make a really simple modification, just so we can see what will happen. I'm going to select any instance of the group. I'll just pick the one in the middle. Up here on the ribbon you get an edit group button. E, G is the shortcut. That takes you to an edit group mode. You know you're in the edit group mode because it tints the background in this yellow color and it displays this little floating toolbar. Now what I'm going to do is select this window element over here.
Go to the Copy command, click any old start point and copy it down to this other bedroom. I'll press Escape to deselect that. Now at the moment, that change only applies to the group that I'm editing, but if I click the Finish button right here, F, G is the shortcut, notice that that change will now apply to both of the other instances of the group. Imagine how powerful that is if we had dozens, if not hundreds, of instances of this group across the entire building.
By making one simple change in edit group mode, we can apply that change globally across the entire project. What about the attached detail groups? This instance is the only one currently that has that. What I'm going to do is just simply select these other two instances using my Ctrl key and then notice that up here on the ribbon you have an Attached Detail Groups button. You can simply click that and it will show you all of the attached detail groups. We only have one in this case. We'll check it and click OK.
Then both of those model instances will now get their own version of the attached detail group. Those are attached detail groups but they actually behave like model groups. Notice that our new window doesn't have a tag. What I can do is select an instance of the attached detail group, click Edit Group, go to my Tag by Category command, T, G is the shortcut. I want to uncheck Leader because I don't need a leader for my window tags and I will tag this window and click Finish.
Notice that when I do, it will add that tag to both of the other instances of the attached detail group. The attached detail groups will behave in exactly the same way as the model groups. They're actually very smart though. If I zoom in right here by the entranceway of the first instance of the group, notice that this is door number one, door number six, and door number 14. Just kind of make a mental note of those numbers. I'm going to zoom back out, come over here and zoom in to the corresponding area of this instance of the group.
Because those tags are actually referencing an instance property, in other words, each door has its own individual number. Even though they're inside the groups, that numbering continues to be instance-based. You can now see that we have door 15, 20, and 26. Same is true with the room numbering. Notice that the room names are preserved. We still have entryway, utility closet, coat closet, but the door tags will continue to increment. It's pretty smart about the way that it applies the changes to both the model groups and the detail groups.
Let me show you one more example. What if you wanted to actually make a slight variation to this apartment unit? Let's say that you wanted to do the two window unit but you wanted to preserve an original that didn't have the two windows. I'm going to select this instance over here. Let's zoom in a little bit. Go over here and choose Edit Type. This is the same process you could do with a family but right now we're doing this on a group. I'll click Duplicate. Instead of two bedroom unit number two, I'll call it two bedroom unit one window.
It's not necessarily a great name, but it will at least remind me of what the difference is. I'll click OK. This is the only instance of the group called one window. I'll edit that group, select this window, delete it, and then finish the group. Notice that that change did not apply to these other two instances because these two instances are still using the original one called two bedroom unit. But now here's where this becomes really useful. I can change my mind about this instance of the group, select it, come over here, and I now have two choices.
When I choose that second choice, not only will it remove the window, but it actually swaps out the different instance of the attached detail group as well and it removes the extra tag. If I change my mind and I put it back to the other unit, it brings the window back with the tag. Both the model group and the attached detail group are going to behave intelligently and you'll be able to have various instances that you can swap in and out. So groups provide a great way for you to manage any repetitive design element that you have throughout your project.
You simply make a group of it and then by making a change to one instance, it applies all across the model to all instances automatically.
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