Interpolation Curves

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Timeline

An interpolation curve in a timeline specifies how each keyframe interpolates to the next.

Linear

The value uses linear interpolation to interpolate between the current key and the next key. The speed of change is constant.

A graph of "linear" interpolation.

Hold

The value returned between the current key and the next key is always current key's value.

A graph of "hold" interpolation.

In technical terms, if we have two keys in a color timeline:

[0:#0,0,0,1;H]
[1:#1,1,1,1;L]

and we attempt to get the value at time index [0,1), then it will always return the color #0,0,0,1. If time index == 1, it will return the color #1,1,1,1.

Ease In

The value eases in to the next key frame. The speed of change is fast at first, then slows towards the end.

A graph of "ease in" interpolation.

Ease Out

The value eases out of the current key frame. The speed of change is slow at first, then accelerates towards the end.

A graph of "ease out" interpolation.

Smooth

The interpolation algorithm can best be described as a combination of "ease out" then "ease in". The speed of change is slow at first, then accelerates in the middle, then slows again towards the end.

A graph of "smooth" interpolation.

If we have two keys in a color timeline:

[0:#0,0,0,1;H]
[1:#1,1,1,1;L]

and we attempt to get the value at time index == 0.5, it will return #0.5,0.5,0.5,1 as the color. Between time index [0.0,0.5), it will exhibit the properties of "ease out" interpolation. Between time index (0.5,1.0], it will exhibit the properties of "ease in" interpolation.

Twist

Same as Smooth, except the first half of the interpolation exhibits the properties of "ease in", and the second half exhibits the properties of "ease out". The speed of change is fase at first, then slows in the middle, then accelerates again towards the end.

A graph of the "twist" interpolation.

Camera

Interpolation curves are a string argument which specify how a camera should move.

Common options:

Less common options:

See also

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