Animator Modifier

An Alternative to Keyframe Animation

The Animator is a bit special because it is halfway between a Generator and a Modifier. Just like every Modifier, it can be added to the data embedded in a parameter or on the result of a Generator, but it has two options:

The Animator allows you to generate a 100% procedural animation on a single parameter (1D/2D/3D/4D), defined by an interpolation type, a start time, and a duration or end time.
In the following example, an Animator Modifier is added to a logo's Position parameter:

Unlike keyframe animation, which allows you to specify several states over time, the purpose of the Animator Modifier is simply to create a transition between two states, as if the animation were created by just two keyframes. Although this may seem more restrictive, the advantage is that this animation is defined solely by numerical parameters that can be exposed in a composition's custom parameters, to create a Template/Package for example.

Interpolation Type and Additional Parameters

The first parameter defines the interpolation type for moving from one state to another. Elastic mode is used by default.
Depending on the interpolation type used, additional options will be added to the list:

End Value Mode

Moving from the initial to the final state is done by setting a value, which can be used in two different ways depending on the End Value Mode.

If Target Value mode is used, the Offset parameter will now be called End Value:

The following examples use a Duration value of 1 second

The Offset mode adds an animation relative to the original position, so the layer can be moved even after the Modifier has been fully applied after the first second.

Since Target Value mode completely replaces the original position values, moving the layer after the first second won't change anything visually, although it will modify the original values.

By default, the Offset/End Value parameter is in Single mode, but can be switched to Unified or Separated mode.

Animation Duration and End Time Mode

The animation duration for switching from one state to another can be set in different ways.

The End Time Mode allows you to choose between a duration relative to the Start Time, or a precise Timecode.
This will change the name of the Duration parameter to End Time:

Start/End Time-Space

The End Time Mode offers two ways of setting the animation duration. But since a layer can be subject to a time offset, the question is whether or not this should be taken into account when defining the animation.

The Start/End Time-Space parameter defines whether the time information is based on:

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