Add randomness to a property with the Wiggler

通过wiggler工具来为一个属性增加随机性

You can add randomness to any property as it varies over time by using the Wiggler.

你可以通过Wiggler工具为任何一个随时间变化而变化的属性增加随机性的效果。

You can also use the wiggle expression method for this purpose. In most cases, it is easier to use the expression than to use the Wiggler.

当然你可以通过wiggle表达式来达到同样的目的。但在大多数情况下，使用表达式要比Wiggler工具更加容易。

Depending on the property and the options you specify, the Wiggler adds a certain number of deviations to a property by adding keyframes and randomizing interpolations coming into or out of existing keyframes. You need at least two keyframes to use the Wiggler.

根据你所指定的属性和选项，Wiggler工具会通过添加关键帧和随机化进入或离开已有关键帧的插值，来将一定的偏移量添加到属性中。你至少需要两个关键帧才能够使用Wiggler工具。

Using the Wiggler, you can more closely simulate natural movement within specified limits. For example, add randomness to an animated butterfly to produce fluttering. Add it to brightness or opacity to simulate the flicker of an old projector.

通过使用Wiggler工具，你可以在指定的限制内更加逼真地模拟自然运动。例如，为一个动画蝴蝶添加随机性来产生飞舞的效果。为亮度或者不透明度添加随机性来模拟老投影机的闪烁效果

1. Select a range of keyframes for the property.

1，选择某一属性一定范围内的关键帧

2. Choose Window > Wiggler.

2，选择窗口-Wiggler

3. For Apply To, select the type of curve you want the Wiggler to change. If you selected keyframes for a property that varies spatially, you can select Spatial Path to add deviations to the motion, or Temporal Graph to add deviations to the velocity. If you selected keyframes for a property that does not vary spatially, you can select only Temporal Graph.

3，在点击“应用于”前，选择你想让Wiggler改变的曲线类型，如果你选择了“空间变化”属性的关键帧，你可以选择“空间路径”来为运动添加偏移量，或者选择“时间图表”来为速度增加偏移量。如果你选择属性的关键帧是非空间变化的，那你只能选择时间图表

4. Select a Noise Type option to specify the type of deviation due to randomly distributed pixel values (noise):Smooth Noise Produces deviations that occur more gradually, without sudden changes.Jagged Noise Produces sudden changes.

4.选择“杂色类型”选项来指定随机分布的像素偏移量的类型：平滑杂色所产生的便宜更加平缓，没有突兀的变化。锯齿状杂色生成的更加突兀。

5. Select the dimensions of the property you want to affect:X, Y, or Z Adds deviations to only one dimension of the selected property. Choose the dimension from the menu.

All Independently：Independently adds a different set of deviations to each dimension.

All The Same：Adds the same set of deviations to all dimensions.

5.选择属性中你想影响的维度：选择X，Y，或Z偏移将会只影响所选择的维度，可以从菜单中选择维度。

全部独立：为每一个维度添加独立的偏移

所有相同：为所有的维度添加相同的偏移

6. Set Frequency to specify how many deviations (keyframes) per second After Effects adds to the selected keyframes. A low value produces only occasional deviations, while a high value produces more erratic results. A value less than 1 creates keyframes at intervals of less than one per second. For example, a value of 0.5 creates one keyframe every 2 seconds.

6.设置频率来指定Ae向所选的关键帧中每秒添加多少偏移，较低的数值会产生偶尔的偏移，较高的数值则产生更不规则的偏移，小于1的数值所产生的关键帧间隔会小于1秒一次，例如，频率0.5意味着两秒产生一个关键帧

7. Set Magnitude to specify the maximum size of the deviations. After Effects sets the specified magnitude to the units of the selected property, so a value for one property may produce very different results in another property.

7.设置量级来指定偏移的最大值，Ae为所选的属性设置指定的量级，所以同样数值的不同属性会有不同的效果

8. Click Apply and preview the results.

8.点击“应用于”并预览结果

9. If necessary, choose Edit > Undo Wiggler to reset the keyframes, adjust the values for Frequency and Magnitude, and then reapply the Wiggler.

9.如果有必要，选择编辑-撤销Wiggler以重置关键帧，调整频率和量级的数值，然后重新应用Wiggler.

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