Setting Extrapolation

Animation and Expressions > Animation > Creating Animations >

Extrapolation defines the shape of an animation curve before the first keyframe and after the last keyframe of the curve. The following table describes the extrapolation modes and illustrates the resulting curves. You can set the default extrapolation mode used when creating animations in the Preferences menu. The default extrapolation is initially set to Constant.

Extrapolation Mode	Resulting Curve
Constant—Applies the channel value in the first keyframe to all frames before the first keyframe. The value of the last keyframe is applied to all frames after the last keyframe.
Linear—Continues the curve in a linear fashion before the first keyframe and after the last keyframe.
Cycle—Creates cycles in the curve. The period of each cycle is determined by the first and last keyframe.
Reverse and Cycle—Repeats, reverses, then cycles the curve.
Mixed—You cannot select Mixed. This option is shown automatically when you select two or more channels that have different extrapolations.