AE common expression summary "suggestions collection"

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AE The order of expressions is from 0 Start calculating , Such as location （x,y,z,） The corresponding is （0,1,,2）

See how to add expressions

Expression tools

A. Expression switch B. Expression chart C. Expression correlator D. Expression language menu

because AE The parameters of different attributes are different , The commonly used ones can be divided into ： The number （ rotate / The opacity ）、 Array （ Location / The zoom ）、 Boolean value （true It means true 、false On behalf of false /0 On behalf of false 、1 It means true ） These three forms are used to write expressions . For the expression AE There are also many built-in function commands , You can call it directly in the expression language menu .

Next, let's take a look at the commonly used expressions ！

1. time expression

principle :

time Time , In seconds ,time*n = Time （ Number of seconds ）*n （ If applied to rotation attribute , be n Show angle ）

give an example :

If you set time Expression for time*60, Then the layer will pass 1 Second time rotation 60 degree ,2 Seconds to 120 Degrees and so on （ Rotate clockwise when the value is positive , Rotate counterclockwise when negative ）

matters needing attention :

time Data that can only be given one-dimensional attributes .( The position attribute can be separated by individual dimensions , Thus, it can be set separately X or Y Upper time)

2. shake / Swing expression

wiggle(freq, amp, octaves = 1, amp_mult = 0.5, t = time)

principle :

freq= frequency （ Set the frequency of jitter per second ）;amp= The amplitude （ The amplitude of each jitter ）;octaves= Amplitude （ On the basis of each amplitude, a certain amplitude will be carried out , Rarely used ）;amp_mult= Frequency doubling （ The default value is ok , The closer the value is 0, The less detail ; The closer the 1, The more details ）;t= The duration of the （ The jitter time is the synthesis time , Generally, there is no need to modify ）; Generally, just write the first two values

give an example :

If in one-dimensional attribute , Add wiggle(10,20), It means that the layer jitters every second 10 Time , The amplitude of each random fluctuation is 20; If in the two-dimensional attribute , Add n=wiggle(1,10);[n[0],n[0]], Represents the scaling of the layer XY Jitter every second 10 Time , The amplitude of each random fluctuation is 20; If in the two-dimensional attribute , Want to shake alone in a single dimension , You need to set the attribute to a separate size and add wiggle(10,20), Represents the scaling of the layer X The axis vibrates every second 10 Time , The amplitude of each random fluctuation is 20.

matters needing attention :

You can run directly on existing properties , Include any keyframes

3. index expression （ Index expression ）

principle :

For how many values per interval to produce how many changes

give an example :

If it is a layer 1 Add an expression to the rotation attribute of index*5 , Then the first layer will rotate 5 degree , Then press Ctrl+D When copying multiple layers , The first 2 Layers will rotate 10 degree , And so on ; If you want to keep the normal shape without rotation on the first layer , The copied figure is represented by 5 Degree increment , The expression can be written as (index-1)*5

4. value expression

principle :

Output the current attribute value at the current time

give an example :

If the expression added to the position attribute is value+100, Then the position will be aligned on the basis of the key frame value X Axial right offset 100（ Positive numbers to the right , Negative numbers are like left ）; If you want to control Y Position attribute of axis , Then the position attribute can be divided by a separate size , Thus, it can control Y Axis （ A positive number goes down , Negative number up ）

matters needing attention :

More usage scenarios are applied together with other expressions

5. random expression （ Random expressions ）

principle :

random(x,y) In numbers x To y Random sampling , The minimum value is x, The maximum value is y

give an example :

If you add an expression to the numeric source text random(20), Then the data will change randomly , The maximum value will not exceed 20;

If you add an expression to the numeric source text random(10,100), Then the data will be in 10< The number <100 Between random changes ; If you add an expression to the numeric source text seedRandom(5, timeless = false),random(50), Then the data will be in 50 Change randomly within （ Ahead 5 It's the number of seeds , For example, it is necessary to make random changes in the values of multiple identical intervals in a picture , We need to add different seed numbers for them , Prevent the two random changes from being the same ）, If you want the number to change randomly into an integer, you should add the expression Math.round(random(2,50)), It means that 2 and 50 Between random changes without decimals

matters needing attention :

Random expressions are not limited to the use of data , Other attributes can also be applied , If the value is an integer Math Of M Use capital letters

6. loopOut expression （ Loop expression ）

principle :

• loopOut(type=” type ”,numkeyframes=0) Cycle a set of actions
• loopOut(type=”pingpong”,numkeyframes=0) It's like a round-trip cycle like table tennis ;
• loopOut(type=”cycle”,numkeyframes=0) It's a cycle ;
• loopOut(type=”continue”) Last speed of continuous attribute change ,
• loopOut(type=”offset”,numkeyframes=0) Is to repeat the specified period of time for a cycle ;
• numkeyframes=0 Is the number of cycles ,0 For infinite cycles ,1 Is the last two keyframes infinite loop ,2 Is the last three keyframes infinite loop ,

And so on

give an example :

Here's the picture gif

7. timeRemap expression （ Frame extraction ）

principle :

timeRemap*n,n In frames

give an example :

Set the layer to timeRemap*10, Represents every 10 The frame is removed 1 frame ,( It depends on the rate of extraction )

matters needing attention :

Use timeRemap Time remapping should be enabled before expression , Otherwise, you cannot use this expression

8. linear expression （ Linear expression ）

principle :

• linear(t, tMin, tMax, value1, value2) Express linear(time, The time when the change began , Time to end the change , The value at the beginning of the change , End the changed value );
• linear(t, value1, value2) Said when time stay 0 To 1 Between time , from value1 Change to value2;
• ease(t, tMin, tMax, value1, value2) Meaning and linear equally , The difference is tMin and tMax point , Slow in and slow out , Make the data smoother ;
• easeIn(t, tMin, tMax, value1, value2) And linear It means the same thing , The difference is tMin It's about , Slow in , Make the data smoother ;
• easeOut(t, tMin, tMax, value1, value2) And linear It means the same thing , The difference is tMax point , Slow out , Make the data smoother

give an example :

See the figure below, all with (time,0,3,131,1000) For example , If you add this expression to the source text attribute of the number, you can make the countdown effect n=linear(time, 0, 3, 3, 0) From 0-3 The number of seconds is from 3 To 0, If you want the number as a whole, you need to add Math.floor(）

matters needing attention :

The usage of countdown is quite common , Integers M Use capital letters

9. Other Math（ Angle, radian ）

principle :

degreesToRadians(degrees) Turn to radian （degrees Variable or expression of degree ）radiansToDegrees(radians) Radian to angle （radians Variables or expressions of radians ）

give an example :

Some calculations in Mathematics sin,cos,tan,sec,csc,cot etc.

10. layer expression

principle :

layer(index) in index Numerical value , Retrieve layers by number ;layer(name) in name Is a string , Retrieve layers by name （ If there is no layer name , Then according to the source name ）;layer(otherLayer, relIndex) in otherLayer Represents a layer object ,relIndex Represents the value , Retrieve numeric layers belonging to layer objects

give an example :

• layer(index)—thisComp.layer(1).position;
• layer(name)—thisComp.layer(“ Shape layer 1”);
• layer(otherLayer, relIndex)—thisComp.layer(thisLayer, 1).active Will return true

11. marker expression

principle :

marker.key(index) in index Numerical value ;marker.key(name) in name Is a string

give an example :

thisComp.marker.key(1).time Indicates the time when the first composite tag is returned ;thisComp.marker.key(“ My name is annotation name ”).time Indicates that the return has a name ” My name is annotation name ” The time of the composite marker

12. comp( Composite properties and methods )width And height expression

principle :

width Represents the return composite width ;height Indicates that the composite height is returned

give an example :

[thisComp.width/2, thisComp.height/2] It means that the width and height are half of the composite, that is, the middle position

13. param expression

principle :

param(name) in name Representation string ;param(index) Represents the value

give an example :

effect(“ Gaussian blur ”).param(“ Ambiguity ”) Effect control points are always in layer space

14. Elastic expression

principle :

Copy and paste expressions can be used ,amp It means amplitude ,freq Frequency ,decay Indicates attenuation （ Make different adjustments according to different needs ）

give an example :

n = 0; if (numKeys > 0){ n = nearestKey(time).index; if (key(n).time > time){n–;}} if (n == 0){t = 0;}else{ t = time – key(n).time;} if (n > 0){ v = velocityAtTime(key(n).time – thisComp.frameDuration/10); amp = .03; freq = 2.5; decay = 4.0; value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t); }else{value;}

Copy and paste the above content to use

Be careful :motion2 Scripts also have this function , There's not only one way

15. Bounce expression

principle :

k Indicates the final result of the rebound ,a Indicates rebound resistance ,b Indicates the rebound change time

give an example :

k=500; a=8; b=30; x=k*(1-Math.exp(-a*time)*Math.cos(b*time));[x,x]（ Adjust according to different situations kab The value of ）

16. Numeric increment expression

principle :

StartNumber Indicates the starting value ,EndNumber Represents the value at the end ,StartTime Indicates the start time ,EndTime Indicates the end time , And the one in front linear The expression corresponds to

give an example :

StartNumber=1; EndNumber=20; StartTime=0; EndTime=3; t=linear(time,StartTime,EndTime,StartNumber,EndNumber);Math.floor(t)

17. Squeeze and stretch

principle :

spd Indicates the speed of extrusion and stretching ,maxDev Indicates the size of extrusion ,decay Indicates attenuation

give an example :

spd =20;maxDev =10; decay = 1; t = time – inPoint; offset = maxDev*Math.sin(t*spd)/Math.exp(t*decay); scaleX = scale[0] + offset;scaleY = scale[1] – offset; [scaleX,scaleY]

18. Sports tail

principle :

delay Indicates the number of frames to delay

give an example :

Add an expression for the location attribute delay = 0.5;

d = delay*thisComp.frameDuration*(index – 1);

thisComp.layer(1).position.valueAtTime(time – d);

If you want to achieve opacity tailing, you need to add an expression for the opacity attribute opacityFactor =.80;

Math.pow(opacityFactor,index – 1)*100( After adjusting a layer, copy multiple )

19、 Conditional expression

The way of writing ：if（ Conditions ） result else result

representative if（ When certain conditions are met ） Get a result else Otherwise, it is another result

give an example ： Give layers 1 Input the expression on the opacity of

x=thisComp.layer(“ Shape layer 2”).transform.position[1];

if (x>540) 100 else 0

It means layer 1 The opacity of is associated with the layer 2 Of y On the shaft ,（[1] It stands for 、 Axis ） As a variable x

That's the expression if（ When the above variable is x Greater than 540 when ） Layers 1 The opacity of is 100 else Otherwise, the opacity is 0

remarks , Write expressions if (x>540) 100 else 0 There should be a space in the middle of each, that is if Space （ Conditions ） Space result space else Space result

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