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In the prior lessons, Trish and I talked about how useful the work area is in After Effects. Among other things it says rather than having to preview your entire composition, which is what I'm doing now, you can go ahead and drag the beginning of the work area, the ending of the work area, and now After Effects will preview just the duration of your comp underneath that work area bar. Kind of convenient! Double-click it to reset it to being the entire length of the composition and then trim it as necessary.
Not only does the work area control your preview duration, it can also optionally control the length of your renders and it also has some impact on some keyframes in some instances. For example, this sets the duration that we use for motion sketching. But there's a lot more you can do with this work area bar. As you may remember, the keyboard shortcuts are B to set the beginning of the work area and N for the end of the work area. If you move the Time Indicator to some point after the work area and type B, it will slide the entire work area bar intact at its current duration.
That's nice if you want to move along the comp say in 10 second increments and keep trying out different parts of it. Another trick you can use to focus on a specific area comp, let's say you have a layer that's been trimmed already to not be the entire length of your composition and you want to preview just that duration, just the duration of the selected layer or layers. Well, if you hold Command+Option on Mac or Ctrl+Alt on Windows and then type B, that shortcut for the beginning of the work area, After Effects will automatically set the work area to equal the duration of the selected layers.
To reset it, again you can either double-click it or pick a layer that's the entire duration of the comp, use the same shortcut, Command+Option+B, and now the work area will be the entire length of the comp. Let's say you have a long composition and after working with it you realize you really don't need the entire composition. You really don't need everything earlier in time and maybe you don't need things later in time as well. Well, if that's the case, set the work area to the area you want to keep and you know this is the only area you want to keep. And then either go up to the Composition menu and select Trim Comp to Work Area or right-click directly on the work area bar and select Trim Comp to Work Area.
This will automatically reduce the length of your comp and slide and trim all your layers to begin at where the work area bar previously started in the older longer composition. That's another handy thing to trim down a large scratch project you might have been working on. But this other commands you can use as well. Let's say after working for while on a particular comp you realize, you know, there is this whole dead section in the middle. It's slowing things down. I really want to just trim that out. You can do a couple of different things.
Again, I'll type B for the beginning of my work area, N for the ending of my work area. I'm going to be careful as to what layers are selected. I'm going to start by deselecting all layers. In other words, they are all equal. If I say look, I need to get rid of this whole area underneath the work area bar, I'll right-click on it and say Extract Work Area. What Extract does is say delete everything underneath the work area bar and slide up everything afterwards in time to fill the gap.
Extract and there is my new trimmed down animation. You noticed that After Effects actually had to split the layer, which made it appear to be duplicated to show one segment here, then jump to this other segment later in time. Now, it did all of the layers because I had none of the layers selected. It would have done the same thing if I had all the layers selected. However, if you have only a specific layer selected, if you say, you know, this snowboarder, it's just the beginning part here that's really dull, so I'm going to go ahead and set my work area here.
I am going to select just that Snowboarding movie, maybe set the beginning here a little bit after the start just so you can see what I'm about to do, then say Extract Work Area. Since I only have one layer selected, it's going to extract, trim out, just that portion of that movie, so now we'll have a jump between this two different sections. Well, that was handy. I'm going to Undo for now. But let's say rather than slide up all the later segments, instead I want to create a gap in my project.
Say I want to leave that gap there because I'm going to fill it with something different. Again, I'll go ahead and set my work area and let's go ahead and say put it down there for now, right-click again, instead of saying Extract, I'm going to say Lift Work Area. What Lift does is remove just the sections underneath the work area and leave everything else as it was. So I have just one layer selected. Lift Work Area. It creates a gap just in that one selected layer and now I can insert something else in that period of time. I'll Undo.
I'll deselect so nobody is selected, right- click on the work area bar, say Lift Work Area. Now you see it had created a gap in all of the layers so I can insert as much material as I need to fill in that gap later on. I'll Undo. So the work area bar is actually more powerful than you think. Rather than just control the amount of times that you are previewing, rendering, or doing something like Motion Sketch, you can also use it as an editing tool to go ahead and trim and slide up portions of the layers in your composition.
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