Add randomness to a property with the Wiggler
通過wiggler工具來為一個屬性增加隨機性
You can add randomness to any property as it varies over time by using the Wiggler.
你可以通過Wiggler工具為任何一個隨時間變化而變化的屬性增加隨機性的效果镰烧。
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.
當然你可以通過wiggle表達式來達到同樣的目的。但在大多數(shù)情況下，使用表達式要比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.
根據(jù)你所指定的屬性和選項，Wiggler工具會通過添加關鍵幀和隨機化進入或離開已有關鍵幀的插值乐横，來將一定的偏移量添加到屬性中。你至少需要兩個關鍵幀才能夠使用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.
通過使用Wiggler工具放前，你可以在指定的限制內(nèi)更加逼真地模擬自然運動。例如糯彬，為一個動畫蝴蝶添加隨機性來產(chǎn)生飛舞的效果凭语。為亮度或者不透明度添加隨機性來模擬老投影機的閃爍效果
1. Select a range of keyframes for the property.
1，選擇某一屬性一定范圍內(nèi)的關鍵幀
2. Choose Window > Wiggler.
2撩扒，選擇窗口-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似扔，在點擊“應用于”前，選擇你想讓Wiggler改變的曲線類型搓谆，如果你選擇了“空間變化”屬性的關鍵幀炒辉，你可以選擇“空間路徑”來為運動添加偏移量，或者選擇“時間圖表”來為速度增加偏移量挽拔。如果你選擇屬性的關鍵幀是非空間變化的辆脸，那你只能選擇時間圖表
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.選擇“雜色類型”選項來指定隨機分布的像素偏移量的類型：平滑雜色所產(chǎn)生的便宜更加平緩，沒有突兀的變化螃诅。鋸齒狀雜色生成的更加突兀啡氢。
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.選擇屬性中你想影響的維度：選擇X，Y术裸，或Z偏移將會只影響所選擇的維度倘是，可以從菜單中選擇維度。
全部獨立：為每一個維度添加獨立的偏移
所有相同：為所有的維度添加相同的偏移
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.設置頻率來指定Ae向所選的關鍵幀中每秒添加多少偏移袭艺，較低的數(shù)值會產(chǎn)生偶爾的偏移搀崭，較高的數(shù)值則產(chǎn)生更不規(guī)則的偏移，小于1的數(shù)值所產(chǎn)生的關鍵幀間隔會小于1秒一次，例如瘤睹，頻率0.5意味著兩秒產(chǎn)生一個關鍵幀
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.設置量級來指定偏移的最大值升敲，Ae為所選的屬性設置指定的量級，所以同樣數(shù)值的不同屬性會有不同的效果
8. Click Apply and preview the results.
8.點擊“應用于”并預覽結果
9. If necessary, choose Edit > Undo Wiggler to reset the keyframes, adjust the values for Frequency and Magnitude, and then reapply the Wiggler.
9.如果有必要轰传，選擇編輯-撤銷Wiggler以重置關鍵幀驴党，調(diào)整頻率和量級的數(shù)值，然后重新應用Wiggler.
最后想說幾句：
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