Time Loop in Friction

1. Create a pendulum animation (10 frames).
2. Create a new scene.
3. Link Scene 0.
4. Add Frame Remapping.
5. Position playhead in the frame where you want the loop to end (10) and add key.
6. Right click frame and Set Expression.

Bindings:

fr=$frame;

Calculate (fr):

return fr%10;

The value after the % symbol is the end frame of the animation (10).

It is a perfect loop because frame 11 = frame 1.