Tutorial: Using Shape Layers to Create Animated Lower-Thirds in Adobe After Effects CC
在本教程中，我们将学习如何使用形状图层进行创建, 定制, 并与Adobe After Effects CC 2015动画低三分之一的图形.
在本教程中 we’ll look at using shape layers to build lower-third graphics with Adobe After Effects CC 2015. I’m going to demonstrate how you can create custom lower-third graphics with some simple techniques.
创建一个新公司
让我们从打开After Effects并创建一个新的合成开始. Select and adjust your composition settings, so that they match your video project. 完成后，按OK.
绘制并定位一个矩形
接下来，我们将导航到工具栏并将鼠标悬停在矩形工具上. You might have another shape visible to you if you've used this tool in past projects. 要将此工具更改为矩形工具, 只需选择下拉箭头并选择矩形(下面的图1).
图1. 确保你选择了矩形工具.
激活形状工具, 现在你可以进入合成窗口，然后, 通过点击和拖动, 你可以开始画一个矩形. Moving your mouse left and right or up and down gives you complete control of how you want this rectangle to look. 如果你想保持你画的矩形或任何形状的比例, 然后你可以按Command+C (Mac OS)或Control+C (Windows)来撤消形状. 现在，在绘制形状之前，按住Shift键点击并拖动.
在本例中，我将绘制如图所示的自定义矩形 图2(下面).
图2. 我们将在本例中使用的自定义矩形.
一旦你画好了形状，选择选择工具来重新定位你的形状. In this example I'll move the rectangle to the bottom part of my Composition window, 因为这是我最后三分之一的人要住的地方.
选择填充颜色
现在可以开始进一步自定义形状. Open up the contents for the Shape Layer by selecting the triangle next to the corresponding layer name in the Timeline panel (下面的图3).
图3. 打开形状图层的内容.
选择Contents下拉菜单，然后选择Rectangle. 在这里你可以调整一些东西, 包括我们的形状的颜色，可以在填充(下面的图4).
图4. 调整矩形的内容
打开填充选项并选择颜色. 这将打开颜色对话框. 在这里你可以选择任何你喜欢的颜色. 使用滴管工具从标志或调色板中选择一种确切的颜色. 对于这个例子，我将选择一个更深的灰色，然后按确定.
添加描边
接下来，让我们在形状周围添加描边. 折叠填充选项并打开描边下拉菜单. Here you can choose a color for your stroke, but I'll skip past that and adjust the width. 在这里，我将输入一个值25. 现在，你可以看到 图5(下面)，该形状具有应用于其上的外部描边.
图5. 选择填充颜色并添加描边的矩形.
你可以在这里继续调整选项，真正微调你的外观.
添加一条线
我将停在那里，并快速添加一条线的形状. 这将有助于区分一个人的名字和头衔, 哪一种通常用于低三分之一的图形. To add a line, begin by navigating to Layer in the menu, and then choose New > Solid (下面的图6).
图6. To add a line, begin by choosing Layer > New > Solid.
“实体设置”对话框将打开(下面的图7). For this example, I’ll select a white color as that is the color I want for my line.
图7. “实体设置”对话框
现在，按确定，调整这个新的白色实体的比例. With the White Solid layer selected in the timeline, press the S key to open the Scale properties. 现在，取消选择“约束比例”选项(下面的图8) and adjust the scale values individually until they fit within the rectangle shape. 这可能需要一些微调，这取决于你如何绘制你的形状.
图8. 取消选择“约束比例”选项.
最后, I’ll adjust the opacity of the layer by selecting it and then pressing the T key to open the Opacity properties. 我将这个值从100改为20%. 这使得线条更加微妙, 但仍然提供了一些区分名称和标题.
下面是三分之一的人，如图所示 图9(下面), that we can add 文本 to either in After Effects or other editing programs such as Premiere Pro CC.
图9. 形状准备好了，我们可以添加文本.
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