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There are several ways to cycle animation in Houdini. For this example we will explain how to cycle the first 25 keyframes through the remaining 125.
Channel Before/After extrapolation
The simplest way to cycle animation is to set the Before and After Extrapolation to Cycle or CycleOffset.
One way to do this is by using the
cycleoffset() expression in the Animation Editor.
Add the parameters that you want to cycle to the Channel List.
Set a keyframe at frame 125 in the Graph view of the Animation Editor.
Select the channel segments from frame 25 to 125.
In the Function menu, choose
cycle() will continue from the starting value of your channels.
Add the parameters that you want to cycle to the Animation Editor.
Switch to the Dopesheet view.
Select frames 1 to 25 (inclusive) in the All Displayed Channels row.
In the Edit menu, choose Copy.
Select frames 26 to 125 (inclusive) in the All Displayed Channels row.
In the Edit menu, choose Paste Special ▸ Cycle (or Repeat).
For more procedural cycling of animation than the
cycleoffset() expressions, you can use Motion Effects.
Add the channels that you want to cycle to the Channel List.
Click the playbar and choose Motion Effects ▸ Cycle.
In the Extend CHOP parameter window that pops up, you can change the Right Behavior from Cycle to Repeat if you want to repeat the animation instead.