关键帧与动画Keyframes & Animation

难度LEVELL3 · 高级L3 · Advanced 领域TOPIC视觉特效

先学：Prerequisites: 节点编辑器

学习目标LEARNING OBJECTIVES

学完你能给 Fusion 节点的参数打关键帧（Keyframe），让数值随时间自动变化，并在关键帧编辑器里把动作调柔。

概念说明CONCEPTS

关键帧（Keyframe）是记录"某帧参数值"的标记——同一参数打上两个不同的值，Fusion 自动在中间插值（Interpolation），生成平滑动画。

  • 键打在检查器里：Inspector 中每个可动画参数右侧都有灰色菱形按钮，点一下就在当前帧落键。
  • 红了就是本帧有键：按钮变红表示当前帧已有关键帧，再点一次即可移除。
  • 激活动画后改值自动落键：参数一旦打过键，移动播放头再改数值，新关键帧自动出现。
  • 帧号可以精确跳：查看器下方时间标尺（Time Ruler）右上角的 Current Time 框可直接输入帧号定位。
  • 关键帧编辑器做粗调：点界面右上 Keyframes 打开关键帧编辑器（Keyframes Editor），框选关键帧按 F 让键前后减速变柔。

操作步骤STEPS

  1. 在节点编辑器选中要动画的节点（如 Transform），在 Inspector 找到目标参数
  2. 在 Current Time 框输入起始帧号，点击参数右侧灰色 Keyframe 按钮落下第一键Inspector 里给参数打关键帧
  3. 移动播放头到后面的帧，直接修改参数值——第二个关键帧自动落下
  4. 按空格播放，看两键之间的自动补间效果
  5. 点击界面右上 Keyframes 打开关键帧编辑器，框选关键帧按 F 让动作变柔关键帧编辑器里压平曲线

练习PRACTICE

  1. 给 Transform 节点的 Size 打两个关键帧，做出从 0.5 放大到 1.0 的动画并播放自检。
  2. 在关键帧编辑器里框选全部关键帧删除，再重做一次三个关键帧的版本。

常见问题FAQ

改了参数，播放时怎么不动？

只有打过关键帧的参数才会动画，且至少要有两个不同值的关键帧。先落键、再移动播放头改值，顺序别反。

关键帧打错帧了怎么删？

把播放头移回那一帧，再点一次红色的 Keyframe 按钮即可移除；也可以在关键帧编辑器里框选后删除。

播放头后面的帧预览不到？

渲染范围（Render Range）之外的帧不渲染、不播放。把动画做在渲染范围之内，或先调整范围的入出点。

Learning Objectives学习目标

After this card you can set keyframes on Fusion node parameters to animate values over time, and soften the motion in the Keyframes Editor.

Concepts概念说明

A keyframe records a parameter's value on a specific frame — set two keys with different values and Fusion interpolates between them, building smooth animation automatically.

  • Keys live in the Inspector: every animatable parameter has a gray diamond button on its right; click once to drop a key at the current frame.
  • Red means a key sits here: the button turns red on frames holding a keyframe; click again to remove it.
  • Change a value, get a key: once a parameter is animated, moving the playhead and editing the value adds a keyframe automatically.
  • Jump by frame number: type exact frames in the Current Time box at the top right of the Time Ruler below the viewer.
  • Rough polish in the Keyframes Editor: open it with the Keyframes button at the top right; lasso keyframes and press F to slow the motion down around each key.

Steps操作步骤

  1. Select the node to animate (e.g. Transform) in the Node Editor and find the target parameter in the Inspector
  2. Type the start frame in the Current Time box and click the gray Keyframe button next to the parameterSetting a keyframe in the Inspector
  3. Move the playhead to a later frame and change the value — the second keyframe drops automatically
  4. Press Spacebar to play and watch the automatic tweening between keys
  5. Click Keyframes at the top right, lasso the keyframes, and press F to soften the motionFlattening curves in the Keyframes Editor

Practice练习

  1. Keyframe a Transform node's Size from 0.5 to 1.0 and play it back to check.
  2. Delete all keyframes in the Keyframes Editor, then rebuild a three-keyframe version.

FAQ常见问题

I changed the value — why doesn't it move?

Only keyframed parameters animate, and you need at least two keys with different values. Drop the key first, then move the playhead and change the value — order matters.

How do I delete a keyframe on the wrong frame?

Move the playhead back to that frame and click the red Keyframe button again, or lasso and delete it in the Keyframes Editor.

Frames later in the comp won't preview?

Frames outside the Render Range are not rendered or played. Keep the animation inside the range, or adjust its In and Out points first.

本卡术语Terms in this card

渲染Render 检查器Inspector 关键帧Keyframe 标记Marker 播放头Playhead 滑动Slide Edit 曲线Curves Fusion 合成Fusion 节点Node 变换Transform