Use the After Effects expression elements along with standard JavaScript elements to write your expressions. You can use the Expression Language menu at any time to insert methods and attributes into an expression, and you can use the pick whip at any time to insert properties.
On Windows, After Effects uses the V8 open-source JavaScript engine. This provides a more modern version of JavaScript than available in ExtendScript, which only supports the third edition of the ECMA-262 Standard.
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Represents thelayer containing the expression. Because thisLayer isthe default object, its use is optional. For example, you can startan expression with thisLayer.width or width andget the same result.
The framesPerSecond value becomesthe frame rate from which the rest of the expression operates. Thisexpression allows you to set the frame rate for a property to belower than the frame rate of the composition. For example, the followingexpression updates the property value with a random value once per second:
Convertsthe value of t, which defaults to the currentcomposition time, to an integer number of frames. The number offrames per second is specified in the fps argument,which defaults to the frame rate of the current composition (1.0 / thisComp.frameDuration).The isDuration argument, which defaults to false,should be true if the t value represents a differencebetween two times instead of an absolute time. Absolute times arerounded down toward negative infinity; durations are rounded awayfrom zero (up for positive values).
If you want more control over the look of the timecode in your footage, use the timeToCurrentFormat method or other timeTo methods to generate the timecode instead of using the Timecode or Numbers effect. Create a text layer, add an expression to the Source Text property, and enter timeToCurrentFormat() in the expression field. With this method, you can format and animate the timecode text. In addition, the timecode uses the same display style defined by the current project settings.
Vector Math functions are global methods that perform operations on arrays, treating them as mathematical vectors. Unlike built-in JavaScript methods, such as Math.sin, these methods are not used with the Math prefix. Unless otherwise specified, Vector Math methods are lenient about dimensions and return a value that is the dimension of the largest input Array object, filling in missing elements with zeros. For example, the expression add([10, 20], [1, 2, 3]) returns [11, 22, 3].
The argument fromPoint is the location in world space of the layer you want to orient. The argument atPoint is the point in world space you want to point the layer at. The return value can be used as an expression for the Orientation property, making the z-axis of the layer point at atPoint. This method is especially useful for cameras and lights. If you use this expression on a camera, turn off auto-orientation. For example, this expression on the Orientation property of a spot light makes the light point at the anchor point of layer number 1 in the same composition: lookAt(position, thisComp.layer(1).position)
The random and gaussRandom methodsuse a seed value that controls the sequence of numbers. By default,the seed is computed as a function of a unique layer identifier,the property within the layer, the current time, and an offset value of0. Call seedRandom to set the offset to somethingother than 0 to create a different random sequence.
If minValOrArray and maxValOrArray areNumbers, this method returns a random number. Approximately 90%of the results are in the range from minValOrArray to maxValOrArray,and the remaining 10% are outside this range. If the arguments areArrays, this method returns an Array of random numbers with the samedimension as the argument with the greater dimension. For each component,approximately 90% of the results are in the range from the correspondingcomponent of minValOrArray to the correspondingcomponent of maxValOrArray, and the remaining10% are outside this range. The results have a Gaussian (bell-shaped)distribution.
For all the Interpolation methods, the argument t is often time or value, though it can have other values, instead. If t is time, the interpolation between values happens over a duration. If t is the value, then the expression maps one range of values to a new range of values.
Converts a color in RGBA space to HSLA space.The input is an Array of normalized red, green, blue, and alphachannel values, all in the range of 0.0 to 1.0. The resulting valueis an Array of hue, saturation, lightness, and alpha channel values, alsoin the range of 0.0 to 1.0. Example:
Retrieves the layer by name. Names are matched according to layer name, or source name if there is no layer name. If duplicate names exist, After Effects uses the first (topmost) one in the Timeline panel. Example:
Retrieves the layer that is relIndex layers above or below otherLayer. For example, thisComp.layer(thisLayer, 1).active returns true if the next layer down in the Timeline panel is active.
You cannot access a composition marker by marker number. If you have a project created in a previous version of After Effects that uses composition marker numbers in expressions, you must change those calls to use marker.key(name) instead. Because the default name of a composition marker is a number, converting the reference to use the name is often just a matter of surrounding the number with quotation marks.
Returns the MarkerKey object of the marker with the specified index. The index refers to the order of the marker in composition time, not to the name of the marker. For example, this expression returns the time of the first composition marker:
Returns the MarkerKey object of the marker withthe specified name. The name value is the nameof the marker, as typed in the comment field in the marker dialogbox, for example, marker.key("1"). For a compositionmarker, the default name is a number. If more than one marker inthe composition has the same name, this method returns the markerthat occurs first in time (in composition time). The value for amarker key is a String, not a Number. For example, this expressionreturns the time of the composition marker with the name "0":
Returns the Camera object for the camera through which the composition is rendered at the current frame. This camera is not necessarily the camera through which you are looking in the Composition panel.
To use a footage item from the Project panel as an object in an expression, use the global footage method, as in footage("file_name"). You can also access a footage object using the source attribute on a layer whose source is a footage item.
Return type: JavaScript object with four attributes: [top, left, width, height]. Extents apply only to shape layers, increasing the size of the layer bounds as necessary, and paragraph text layers (After Effects 15.1 and later), where it returns the bounds of the paragraph box. Example: myTextLayer.sourceRectAtTime().width.
After Effects finds the effect by its name in the Effect Controls panel. The name can be the default name or a user-defined name. If multiple effects have the same name, the effect closest to the top of the Effect Controls panel is used. Example:
Use the hasParent attributeto determine if a layer has a parent layer. You can use this attributeeven if the layer has no parent layer at present. For example, the followingexpression indicates that the layer to which you apply it wigglesbased on the position of the parent. If the layer has no parent,then it wiggles based on its own position. If the layer is givena parent later, then the behavior of the layer changes accordingly:
In general, the value of outPoint is greater than the value of inPoint. However, if a layer is reversed in time, the value of inPoint is greater than the value of outPoint. Similarly, the value of startTime can be greater than the value of inPoint.
Samples the color and alpha channel values of a layer and returns the average alpha-weighted value of the pixels within the specified distance of the point as an array: [red, green, blue, alpha]. If postEffect is true, the sampled values are for the layer after masks and effects on that layer have been rendered; if postEffect is false, the sampled values are for the layer before masks and effects have been rendered. The input value point is in layer space; the point [0,0] is the center of the upper-left pixel in the layer. The input value radius specifies the horizontal and vertical distance from the sample center to the edges of the sampled rectangle. The default value samples one pixel.
When you add masks, effects, paint, or text to a layer, After Effects adds new properties to the Timeline panel. There are too many of these properties to list here, so use the pick whip to learn the syntax for referring to them in your expressions.
Returns the position value of the layer, in world space if the layer has no parent. If the layer has a parent, it returns the position value of the layer in the coordinate system of the parent layer (in the layer space of the parent layer).
Returns the value of the Audio Levels property of the layer in decibels. This value is a 2D value; the first value represents the left audio channel, and the second value represents the right. The value isn't the amplitude of the audio track of the source material. Instead, it's the value of the Audio Levels property, which may be affected by keyframes.
Returns the MarkerKey object of the layer markerwith the specified name. The name value is thename of the marker, as typed in the comment field in the markerdialog box, for example, marker.key("ch1"). Ifmore than one marker on the layer has the same name, this methodreturns the marker that occurs first in time (in layer time). Thevalue for a marker key is a String, not a Number.
Projects a point located in composition space to a point on the surface of the layer (zero z-value) at the location where it appears when viewed from the active camera. This method is useful for setting effect control points. Use with 3D layers only.