How to Cycle only part of the frames in an animation

Question

How can I cycle only some key frames of an animation in graph editor?

Let's say I have an animation with 100 frames. When I apply cyclic F-Curve modifier, all the frames are made cyclic, i.e, after frame 100, frames 1-100 are again repeated and so on.

I want only the later part of the frames to be made cyclic, i.e, after frame 100, frames 75-100 should be repeated endlessly.

I have tried selecting only frames 75-100 and applying the modifier, but still it is applied on 1-100.

Any help would be appreciated.

The cycles modifier takes all your keyframes for a property and loops them, it doesn't allow you to loop part of your animation. If you want just a part to be repeated, you can select all the related keyframes and duplicate them with SHIFT+D then X to slide them on the x axis. Then, you can repeat that as many times as you want. — mqbaka mqbaka, Nov 09 '21 at 10:19

score 1 · Accepted Answer · answered Nov 09 '21 at 18:10

One way to do this is with actions and the nonlinear animation editor.

Create an action starting at frame 1 and do the animation you would do up to frame 75 inclusive.
Push it down to the NLA
Create a new action starting at frame 75. Start it by keyframing everything that was keyframed at 75 in the first action.
do the animation from frame 75 to frame 100.
Push it down to the NLA.

In the NLA you will have a track that looks something like this:

For my simple example, instead of 1-75, 75-100, I did 1-10, 10-20, so the actions aren't in the same places they'd be in your animation.

Select the second action, the one I called 'bounce' in my example, and open the side panel of the NLA (Shortcut N to toggle). Select the Strip tab and open all of the panels. You'll see something like this:

You can't set the repeat to infinite, but you can set it to a large enough number to cover your animation. In my 250 frame example, I set it to 24:

How to Cycle only part of the frames in an animation

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