Now, you can't apply a drop shadow because it would apply it as an effect and the effect would render before the track matte. Now, one solution for this problem is instead of applying the drop shadow to the matte, you apply a layer style to the fill. Again, I'm digging my hole even deeper because now I have to find another solution. If you remember, when we looked at the alpha channel, while the apple was 100% solid, it's creating a drop shadow that's semi-transparent and this transparency, these gray levels, are being used to make the fill movie semi-transparent. It's getting its color from the fill movie. However, I think my client is going to notice that the drop shadow is no longer black, it's pink. And since I can't think of an easy solution, I'm going to have to compromise here and hope that the problem isn't too noticeable. But remember that the Wigglerama behavior continues to randomly animate the apple and because Wigglerama is an effect and effects are not transferred from parent to child, the fill movie doesn't wiggle around as well. So the fill movie will follow the scale animation at the beginning. Now, any transformations applied to the apple will also be applied to the fill. I can partly solve this by opening the parent column and parenting the fill movie to the animated matte layer. And as it wiggles around, it's also wiggling independently of the fill movie. My first problem is that the apple is scaling up and as it scales up, the fill movie is not scaling with it. Because it's using the gray values, some of the apple is getting a little transparent, so I think I will use it as an alpha matte. And I have a choice, really, on whether or not I want to use the alpha matte, which uses the alpha channel, or whether I want to use it as a Luma Matte, and that will take the gray values of the apple as a matte. I'll click on toggle switches and modes and that will bring the track matte pop-ups forward. There's my apple, so let's just see which part of the movie. It just lines up a different part of the movie to the apple. And you might think well, it's starting at time zero and my matte starts at one second, so it must be important to move it in time. If you remember from the track mattes lesson, the fill always needs to be below the matte. My first problem is that the movie is sitting on top of the matte. I'm adding the fill movie to a composition where the matte is already animating. So let's add this movie to the composition. In the project panel, under sources, I have a nice movie called Light Illusions and it's got some areas that are red and pink, particularly on the left-hand side, that I think would look good filling the apple. Now that we understand what the apple is doing, let's look at the movie we'll be using to fill its alpha channel with. So that will be important in just a second. It's adding a black transparent shadow, so that's adding gray values to the layer's alpha channel. The drop shadow, by the way, is being applied and it looks black. So after the apple scales up, it has some random animation, thanks to Wigglerama, and that makes it look a little bit more interesting. Also notice that there's a drop shadow and that renders after Wigglerama. If you're wondering where I found this, it's actually an animation preset you'll find underneath behaviors. The 3D animation itself is rotating, but it's also doing a little bit of a wiggle and that's thanks to an effect, if I select the layer and press F3, an effect called Wigglerama. At one second, it starts fading up and it also scales up to 100%. First off, notice the layer does not start until one second in. I'll select the apple layer and I'll click the solo button just so we can focus on just this one layer. But first, let's understand a little more about how the apple is actually animating. Now I could show you how to do it in an efficient way, but I thought it would be helpful if I first walk you through how not to do it because actually how not to do it is how most people would approach the problem. So we had the great idea of why don't we take the gray apple, this wireframe apple, and use it as a track matte, that way we can fill it with a colorful movie. This comp uses some of the same elements as the previous chapter, but the titles are animating and the apple is just a plain gray color. There's only one composition, the Red Apple comp. If you have the exercise files, go ahead and open Precompose_2-Leave.
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