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In this chapter, we're going to look at groups and blocks and the difference between the two.

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Some people get a bit confused between the two, but each one has a specific use case and we'll look

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at those now and compare them.

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So for this chapter, if you want to follow along, we're going to be using a built in zero one model

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that's included in the resources.

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We've used this before.

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And as I said before, if you open it and it looks something like this.

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If you haven't gone over layouts and viewports and things yet, don't worry about it.

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Just click on down here where it says model.

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You want it to be a black background and look like this.

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Okay?

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So once you've got this open, you can follow along if you wish these basic modules.

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Again, as I've said before, you can just sit back and watch them.

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They are about teaching the concepts, not necessarily creating something.

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So feel free to sit back and watch these.

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And in in your actual modeling lesson, you'll put it into practice.

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Okay, so let's look at groups first now.

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Supposing I wanted to change these lights.

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These are lights, by the way, these orange components in this building layout.

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So in each room, you've got a set of lights.

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Now, maybe I wanted to do something with them.

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And every time I wanted to change them.

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I had to select every light.

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Okay.

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Now we've looked at selection tools.

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There's quick ways of doing it.

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It might be you could just right click it, select similar.

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That's worked in this case.

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So each time we wanted to do it, we could do that, select similar, but that doesn't always work.

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And sometimes it's more complex than that, or sometimes you might not want every single light, so

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it might be another building with lights and it select those as well.

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So how can we get around that if every time we want to do a command on all these lights, we have to

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select them all?

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Well, we can create what's known as groups.

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Okay, so if I just do select similar ones to select them.

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So once I've selected all the objects I want, if I know I'm going to select those again multiple times

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to do different commands on there.

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Now, probably best creating a group out of them.

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And I can do that by right clicking and going down.

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You'll see group and it is just a group command.

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Okay, so I can select that.

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And now it will stay down here.

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22 found.

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An unnamed group has been created.

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Okay.

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And now when I click just one of them, it selects them all.

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And I can do I can change things.

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I can do various things on here and I can put them on different layers.

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I can change the colors and it affects all those objects in one go because I've made them a group.

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And I can leave them like that.

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I can leave them in the drawing as a group if I know I'm going to use it over and over.

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I could just leave out and if I right click now and go to group, I can get other options so I can ungroup

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them, which will put them back to individual items.

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I can click on Add to group.

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Maybe I wanted to add that to the group for some reason.

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I don't know.

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I'll just get that I can add objects to it.

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Okay.

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Or I can remove if I wanted to remove these two, say I can remove them from the group.

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And you end up with this group that stays in my drawing.

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And every time I want to check to select those same objects, I can do it.

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Maybe I wanted to do it with the doors, so I'll try to select similar.

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Okay.

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And I'll add those to a group.

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Okay.

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And now each time I want to select the doors, I can just click one and it's a group.

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But it's not a permanent thing.

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It's not an item that remains.

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They all remain individual items.

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It's just a selection, a way of selecting multiple objects.

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And you'll see up here, if I was to click on the doors, they're all are.

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It's only selected these arcs, by the way.

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It's not selected select some of didn't select these.

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Okay.

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But it's saying there is nine arcs in this group.

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And if I wanted to do things like change the color of them, I could I could change them all to yellow.

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I could put them on different line types, all sorts of things.

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So that's group.

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It's just a way of quickly selecting multiple objects over and over again without selecting them.

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And if they remain individual objects, that's the important thing to remember.

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They remain individual objects themselves.

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And it's just a group really is a temporary thing you would do.

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Okay.

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And you can ungroup them at any time.

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So that's groups is there just to help you select multiple objects.

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So what they're now blocks.

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Okay.

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We've got some blocks in this drawing.

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These lights here, these are blocks.

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If we look at a light and I'm just going to copy one out so we can play about with it.

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If I was to click this object, if you look at it first, you can see it's four lines.

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We've got two short lines on the end and then the two longer lines.

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But if I click on one of these lines, it selects a whole thing.

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Okay?

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That's because it is a block.

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Now it looks like it's doing the same as what our group did.

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Maybe we've just grouped these four lines, but a block is different.

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A block is an actual one object.

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If I click this, it doesn't say four lines, but it would if we'd grouped them.

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It says block reference.

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It's turned into one object and you do this If there is an item that you want multiple instances of

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in your drawing.

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Okay, Then you create a block.

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And the beauty of a block is you can double click that block, okay?

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And it'll ask you to edit it.

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So this is a list of all the blocks in the drawing.

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You can select the light.

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And what I'm going to do now is I'm just going to draw a circle.

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I'm just going to put a circle like that.

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Okay.

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For whatever reason, I'm going to put a circle there and I'm going to close that and it will ask me,

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Do you want to save it?

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So I'm going to save it to the block.

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Okay.

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And now when we click it again, it's just selecting all the objects as a block.

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We've edited that block and we've added that circle.

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But if we look at all these now, okay, it's done the same and you can see where we've mirrored the

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block is where it's put it on the other side.

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So you can see a block is a is one object that you use multiple times and by and if you want to change

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it, you can just change one instance of it and it will change all the other blocks.

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So that's the power of blocks and we tend to use blocks for things like this where it's symbols.

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If you add some tables or chairs, they would be a block, for instance, and you'd have multiple instances

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of that block.

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So a group to recap is a collection of objects.

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It's just an ease of selection thing, really.

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It's just allows you to select the same groups of objects over and over just by gathering them together

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or grouping them together, should I say.

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Whereas a block is an actual physical item.

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It's one item that you've created and saved as a whole.

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So you've put all those lines and circles together as one object and it is just one object.

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And if you were to select four, it would say you've selected four blocks.

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It wouldn't say you've selected 18 lines, for instance.

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So that is the difference.

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And there's all sorts of things you can do with blocks.

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But the purpose of this is just to outline what they are and the difference between blocks and groups.

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And again, the best way you're going to learn this is just by using them, which you will do in the

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courses.

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So this is an overview and then you'll see a use case for it as you're doing the modeling.

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But that's it basically for this lesson, it's just an overview of what a block is and what a group

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is.

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And hopefully you now know the difference.

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If not, you might need to watch again.

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But hopefully that was clear enough.