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In this course, Chris Meyer demonstrates the most common techniques for adding selective transparency to layers in After Effects through the use of masks, track mattes, and stencils. In addition to explaining the tools and basic theory behind transparency, the course covers several practical applications for these techniques, including isolating objects, creating vignettes, and filling text with visual texture. Tutorials on crafting custom transitions and other treatments are also included. Exercise files accompany the course.
The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.
In the previous chapter we used the mask shape tool to drag out some simple mask shapes to create transparency for a layer. However, if we need a more complex shape, for example to cut out a flower such as this, we need to use a different tool, the Pen tool. Its shortcut is G. I select the Pen tool and make sure the first option is currently selected. You can go ahead and switch to these other options in context while you're editing. So make sure that first one is the currently active one. And for now we're going to turn off the RotoBezier option.
We'll demonstrate RotoBezier a little bit later on. If you have the exercise files that came with this project, open up the comp 02a-Bezier*starter. Bezier is the name of the type of curve you'll be creating with the Pen tool. And just as before make sure your layer is selected before you start drawing out a mask. Otherwise you'll just creating a brand-new shape layer rather than cutting out your desired layer. We're going to initially just click around to get familiar with using the Pen tool then we'll use it more carefully to try to cut out this flower.
If you just click the mouse, move it, and click again, you'll draw straight line segments for your mask shape. However, if you move to another location to press the mouse button and before you release start to dragging, you'll get curved mask shapes. Now you go ahead and drag on this handle to create its length, which is its influence and its angle. I'll click and drag on another point, then drag at another point, at another point. Now it's quite common while you're dragging out a mask shape that you realize may be you made a mistake with one of these previous points.
You can wait till you're done creating a mask. This little O by the Pen tool says you're about to close the mask. And then edit it later. That's what I am going to show you in the next movie. Or if you just can't stand looking at your mistakes you can go ahead and edit it before you've finished a mask. If you want to delete a previous point, one that's not currently selected, just hover your cursor over it. You'll see a little minus symbol appear next to your cursor. Click that and it will delete that point. If you want to add a point along an existing line segment place the cursor over that segment and now it'll turn to a plus symbol.
And now you have a brand-new point. If you want to move the location of a previous mask point or vertex or re-drag one of the handles, you need to hold down Command on Mac or Ctrl on Windows and watch the cursor change to this solid black arrow. Once you have that, you've got the Selection tool which means you can select and relocate your mask points as well as drag out the handles again. When you release the Command or Ctrl key, you get this upside down V cursor. That is the Change Direction tool.
If you were to drag on a handle in this condition you would break the handle and create a discontinuous curve through that segment. Now you don't always get that Change Direction tool just by hovering your cursor over it. If you do want to change direction of a vertex hold down the Option key on Mac or Alt key on Windows and then you'll get that inverted V. Clicking on a straight line segment point will convert it to a rounded segment. Clicking on a rounded segment point we will convert it back to a straight corner again. If you have discontinuous points like I have here where I've dragged out the handle, you'll need to convert it back to either a straight line segment or a curved segment.
Again you'll hold down Option or Alt, get the Change Direction cursor. Click once to get a straight segment; click again to go ahead and get now your Bezier handles. And if you want to edit those Bezier handles, hold down Command on Mac or Ctrl on Windows. In general hover your cursor over existing points or handles. Observe the cursor shape. For example, this inverted V is the Change Direction tool. And then on Mac, use Command and Option or on Windows use Ctrl and Alt to change the purpose of that tool. Solid arrow is the Selection tool.
Inverted V is the Change Direction tool. To continue drawing your mask, you need to reselect your last point that you drew along your mask shape, which means to holding down Command or Ctrl, clicking on it, and now you've selected it again. And now you can go ahead and continue clicking at your mask shape. To close your mask path hover the cursor over your first mask point. It's the one with 2 boxes around it instead of one. You'll see a little O appear next to the Pen tool and that indicates you're about to close your mask path.
Click and now you've got a closed mask shape that reveals just the portion of the layer that's inside that mask. By the way, you don't need to create closed mask shapes. We'll show you later on. A good reason is to create open that mask shapes. To do that, when you're almost ready to close, just switch back to the Selection tool and now you have an open mask path. So now that you have a general idea, I am going to give you a quick demonstration of how to do masking for real. And I'll go ahead and select the mask and delete the whole shape.
I am going to go ahead and zoom up to 200% so I can see my flower in greater detail. Hold down the spacebar to temporarily switch to the Hand tool and center it up. Select my Pen tool and start dragging. Okay. Let's say I want to start here. I've got a sharp corner so I only need to click once to create a sharp corner there. And I'll start dragging out some little curves right along this edge as I go.
If I have a sharper corner I'll have very short handles. If I have a more sweeping corner, I'll go ahead and drag out longer handles. If I have a discontinuous edge like a corner, I'll just do single click to add a point without any handles. Let's just keep dragging here out. That's kind of smooth. It has kind of a square edge there. Once I get these longer segments, I'll go ahead and drag out much longer handles for longer influence, like that.
Hold down spacebar to temporarily get the Hand tool and keep dragging along the edge of my tulip. Sharp corner there, sharp corner there, and continue to draw around the shape. I am not going to make you sit there and watch me draw all the rest of this mask shape. However, it would be educational to see how I correct this mask shape and that's what I am going to do in the next movie.
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