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Полезные выражения (Expression) в After Effects

Полезные выражения (Expression) в After Effects.

Выражение (Expression) AutoFade в After Effects (применяем к opacity)

Выражение (Expression) для таймера обратного отсчета в After Effects (применяем к Source Text)

Выражение (Expression) затухающих колебаний в After Effects

Выражение (Expression) в After Effects для Time Remap

Выражение (Expression) в After Effects для вращения с постоянной скоростью без ключевых кадров

Выражение (Expression) в After Effects для движения по спирали (применяем на position)

Выражение (Expression) в After Effects для перемщения с постоянной скоростью без ключевых кадров

Выражение (Expression) Wiggle в After Effects

Wiggle выражения хаотичного изменения значения. Это выражение может использоваться, чтобы сделать вашу сцену более органичной и естественной.

Первая цифра – количество сдвигов в секунду, а второе число – значение покачивания.

Выражение (Expression) Time в After Effects

Выражение Time идеально подходит для объектов с бесконечным движением. Например, если вы хотите, чтобы объект вращался бесконечно, вы можете просто добавить слово time в качестве параметра вращения, и ваш объект будет вращаться на 1 градус на длине всей композиции. Параметр времени также работает с основными математическими уравнениями, поэтому если вы хотите, чтобы слой вращался в 30 раз быстрее, вы можете просто написать выражение time*30.

Выражение (Expression) loopOut в After Effects для цикличной анимации

Цикличная анимация. Выражению loopOut() требуется наличия ключевых кадров. Так что если у вас есть слой, который вращается по кругу в течение 1 секунды, вы можете добавить выражение loopOut(), и движение будет повторяться зациклено.

Выражение (Expression) seedRandom в After Effects для рандома (случайности)

Выражение (Expression) Math.round в After Effects для рандома (случайности)

Math.round() – это выражение, округляющее десятичные числа до ближайшего целого числа. Он идеально подходит для выполнения обратных отсчетов или цифр в исходном тексте. Просто добавьте свое исходное выражение в круглую скобку выражения Math.round() в поле выражения source text, и все ваши числа будут округлены.

Выражение (Expression) Snap Zoom In/Out в After Effects

Применяем на текст. Применяем на Scale параметр. Это выражение создает масштабирование слоя в начале и конце слоя.

Если ты используешь ось Z, то примени это выражение

Выражение (Expression) Y Axis Jitter в After Effects

Создает случайное неустойчивое движение по оси Y. В переменную pos, пишем значения для определения силы Jitter.

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Timer

This After Effects script creates a simple animated timer HH:MM:SS, with controllable speed and start time.

USAGE

Select a text layer.
Execute the script and adjust parameters.

Free material license

These scripts are copyrighted by Motion Boutique.
They are free for personal and commercial use but come “as is” with no warranty nor any free personal support.
Redistribution in any form is not allowed, instead always link to www.motionboutique.com for correct files.
By downloading any of these scripts, you agree the above terms.

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Timer

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AE Rig Series: Countdown Timer

Learn how to build a Countdown Timer rig in After Effects using expressions, or download our ready to run script.

Read more posts by this author.

In this tutorial we’ll construct a Timer rig that can be easily controlled using expression control effects.

Running the Timer script in AE.

Quick Reference

Below is the complete expression for quick reference and a walkthrough on how to set up the Timer object. For a code breakdown or to learn how to build it from scratch jump to the Building the Timer Rig section.

Setup

Create a new text layer in a new or existing comp and rename it to Timer (or whatever you choose).

Next create the following expression controls:

Finally, paste the expression below in the source text attribute of the text layer.

Building the Timer Rig

We’ll be building the rig from scratch so we can understand exactly what’s going on. We can then adapt this knowledge to customize our Timer further or to build similar items. Most of the methods used throughout this tutorial will come in very handy when building any other rigs.

Setup

Basic Timer Functions

Since we’ll be working with Time, it’s important to understand some basics. In After Effects, you can use the time method to get the current time in seconds.

This could do for a basic Timer, right? To turn it into a countdown Timer we can simply subtract the time method from a predefined value.

Simple Countdown Timer.

Count twice as fast.

Now for every second, our Timer will display double the value. Basically count twice as fast. To count twice as slow we can use:

Count twice as slow.

There are different types of controls that we will cover throughout the tutorial. For now let’s create a new Slider Control by heading over to the Effects Panel CMD/CTRL 5 and searching for it in the search box. Double click to apply the effect to the layer.

Note: Make sure to select the Timer layer before Double Clicking on the effect to apply it.

Referencing the Rate Slider. Control the Timer speed with the Rate Slider control.

Note: We could use a negative rate value to have the Timer count down but we’ll create a checkbox control for that instead, later on.

Limiting the Slider range.

Let’s move on to adding features to our Timer.

Setting a Start Time

An essential feature is the ability to specify a start time. Let’s add some new expression controls so we can define this in Hours, Minutes, and Seconds.

Add 3 new Slider controls and rename them to:

Now reference them in the Timer source text expression box.

Referencing the Start Time Sliders.

Since time in AE is returned in seconds, let’s convert the Hours and Minutes and sum them up so we have a total time in Seconds.

There are 60 seconds in 1 minute, and 3600 seconds in 1 hour, so we multiply the number of seconds in each unit by their value.

Converting time to seconds.

Now let’s add the sum to our current time.

Timer begins at predefined Start Time.

If you change the values of any of the three Start Time sliders you’ll see the text displaying the sum of those, plus the current time, in seconds.

Count Up or Count Down

Let’s add the option for the Timer to count up or down.

Now reference it in our expression.

Referencing the Countdown checkbox control.

Conditional Statements

If you are unfamiliar with conditional statements in programming, here is an example:

Conditional Statement structure.

We want to check whether our checkbox is on | 1 | true or off | 0 | false so we can simply pass it as a variable inside the brackets.

Conditional Statement example.

Conditional Statement for counting up or down.

Shorthand Conditional Statements

There is a shorter way of writing a conditional statement, using Conditional Ternary Operators and we can assign the outcome directly to the t variable.

Shorthand conditional implementation.

Finally, let’s have the Timer start at the layer’s in point, so we can move the layer around in the Timeline to define when the Timer will start counting. We can access a layer’s in point using layer.inPoint and simply inPoint if we are referring to the current layer.

Timer starts at layer’s inPoint.

Here is the snippet in context.

Timer with countdown feature.

Let’s move on to formatting, so we can control the way the time is displayed.

Formatting Time

Converting Seconds into Hours and Minutes

Note: A more detailed explanation of the modulus operator is featured here: The Modulus Operator in Detail.

So the operations, in order, are (with t being the total seconds):

Note: The Substring method substr() is used to cut characters from a string based on their position. Using substr(3) would cut everything after the third character starting from the beginning of the string. Using substr(-3) performs the same cut, but starting from the end of the string.

Using an Array to Store the Conversions

Let’s store these conversions in a single variable ( f ), by using an Array.

Storing conversions into Array.

If time is less than or equal to 0, cap all values to 0 (with padding). Else, store the time conversion operations we defined earlier. Paste the following snippet at the bottom of the expression.

Capping negative values at zero.

If you press play now, you will notice a bunch of rather long numbers separated by commas. We still need to round those numbers down! (except for Milliseconds since we dealt with those earlier using toFixed() and substr() ).

Rounding Numbers Down

For rounding down we’ll use the Math.floor() method as discussed previously in the Basic Timer Functions section.

We could write something like this:

Rounding each item in the array.

Looping through Array Items

Paste this snippet at the bottom of your expression. We now have our numbers nicely rounded to whole numbers.

Using a for loop to round each item in the array.

Join Array Items

Using join() to combine all elements in the array.

Zero Padding

The padStart() method pads the current string with another string (multiple times, if needed) until the resulting string reaches the given length. The padding is applied from the start of the current string. — MDN Web Docs.

Since padStart() requires a String we have to first convert our Numbers to Strings. Then we can use the padStart() method by specifying the length that the new String should be, and by what character it needs to be padded by. For our purpose we’ll specify a length of 2 and the «0» character (quoted, as we are working with Strings, remember!).

We need to apply this to all our items in our Time array. Let’s include this method in the for loop we setup earlier (appended to the rounding method Math.floor() ).

Padding each item in the array.

Padding Milliseconds with the correct length.

Toggling Milliseconds Visibility

We may want to toggle on or off the Milliseconds display. Let’s add a new Checkbox control to our Timer layer.

Referencing the Milliseconds checkbox control.

For the toggle to work we are going to use a method named pop() on our array. This will remove the last item of the array and, conveniently, our Milliseconds item is the last item of the array.

Popping the Milliseconds if the checkbox is off.

Time Format Dropdown Menu

In this section we are going to add the ability to choose between 3 time formats using the Dropdown Menu control.

Note: The dropdown menu control is a new feature in The After Effects 2020 (17.0) version. If you are running a previous version you may want to use a Checkbox control for each format to toggle between them.

Add a new Dropdown Menu control to the Timer layer. Rename it to Time Format and reference it in the expression.

Referencing the Time Format dropdown menu control.

Now head over to the Edit. button next to the new dropdown we created and edit the values to have:

Once set, we can start writing the logic for our control. We could easily use a conditional statement to check which option is selected in the dropdown.

Conditional statement for the format options.

But let’s use another way to achieve the same thing, that may be better suited for checking multiple cases: using a Switch Statement.

Switch Statements

Let’s look at the structure of a Switch Statement first.

The switch statement evaluates an expression, matching the expression’s value to a case clause, and executes statements associated with that case, as well as statements in cases that follow the matching case. — MDN Web Docs.

Slicing and Joining Arrays

Let’s implement slice() and join() for each case. Remember that the Milliseconds are handled by our checkbox control so we don’t have to deal with that here.

Here we just need to join the array since we are displaying all the items.

So to retrieve all items but the first 2 we simply pass 2 as the start range.

The Completed Switch Statement

Paste the following snippet at the bottom of the expression. Make sure there is a break statement at the bottom of each case, and we are good to go.

Switch statement for the Time format options.

Negative Time

Referencing the Negative Time checkbox control.

Prepending the minus sign to the current time.

Conclusion

Here is the final expression.

Completed Timer Rig expression.

This concludes the tutorial! Hopefully you now have a fully functioning Timer rig and a solid understanding of how it was built.

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