# 函数曲线修改器¶

F-Curve modifiers are similar to object modifiers, in that they add non-destructive effects that can be adjusted at any time and layered to create more complex effects.

Modifiers are evaluated from top to bottom. You can change their order by dragging the dots in their top right corner.

## 界面¶

By default, modifiers are named after their function, but this can be changed.

Click the checkbox in a modifier's header to disable it.

Click the cross in a modifier's header to delete it.

Lets you blend between the original curve and the modified one.

The number of frames, relative the start/end values above, it takes the modifier to fade in/out.

## 添加修改器¶

Modifiers can be managed on the Modifiers tab of the Sidebar. Select an F-Curve (in the channel region or by selecting one of its keyframes), then click the Add Modifier dropdown and choose the modifier to add.

## 修改器的类型¶

### 生成器修改器¶

Creates a polynomial function. These are basic mathematical formulas that represent lines, parabolas, and other more complex curves, depending on the values used.

Equation in the form $$y = A + Bx^1 + Cx^2 + ... + Dx^n$$.

Add the polynomial to the curve rather than replacing it.

The highest power of x for this polynomial.

The constants A, B, C... in the equation.

### 内建函数修改器¶

Add the function to the curve rather than replacing it.

### 封套修改器¶

Lets you reshape the curve. First, you define an envelope, which consists of two horizontal lines that more or less match the curve's lower and upper bounds. Then, you add control points, where each point can push, squeeze, and stretch the envelope (and the curve along with it) at a certain frame.

The value which the envelope is centered around.

The offset from the reference value to the envelope's initial lower/upper bound.

Adds a control point at the current frame.

The offset from the reference value to the envelope's adjusted lower/upper bound at this frame.

### 循环修改器¶

Makes the curve repeat itself.

Note

"循环" 修改器只能是第一个修改器。

Do not repeat the curve before/after the original.

Repeats the curve, keeping the values of each copy the same.

Repeats the curve, offsetting each copy vertically so that its first keyframe matches the previous last keyframe.

Repeats the curve, flipping every other copy horizontally.

The number of copies to create. A value of 0 means infinite.

#### 简单循环曲线¶

• 自动贝塞尔控制柄放置可识别循环并进行调整以实现平滑过渡。

• 可以启用 循环感知插帧 选项，以在插入新关键帧时考虑循环。

### 噪波修改器¶

Modifies the curve with a noise formula. This is useful for adding subtle or extreme randomness to animated movements, like camera shake.

Adds noise in the range [-0.5, 0.5].

Adds noise in the range [0, 1].

Subtracts noise in the range [0, 1].

Multiplies by noise in the range [0, 1].

Changes the horizontal scale of the noise. Higher values make for less dense oscillation.

Changes the vertical scale of the noise.

### 限制修改器¶

Limits the curve to specific time and value ranges.

X 最小值/最大值

Removes the original curve data to the left of the minimum frame and to the right of the maximum, replacing it by Constant extrapolation.

Y 最小值/最大值

Clamps the curve values, never letting them go below the minimum or above the maximum.

### 步进插值修改器¶

Gives the curve a stepped appearance by sampling it every N frames and making it hold its value after each sample. In a sense, this lowers the curve's frame rate by letting it change its value less frequently, producing choppy movement as a result.

The number of frames to hold each step.

The number of frames to offset the sample points.

The frame where to start applying the effect.

The frame where to stop applying the effect.