Ik hoop dat je hier wat mee kan. Het is helaas in het engels maar het wijst zich vanzelf in combinatie met de afbeelding.
Ik wist dat ik het al eens tegen was gekomen.
Instead of using one Ocean Modifier, use two identical ones. The following values are the ones used in this example.
Key Frames on frame 1 and frame 21. Since these frames will be identical, the loop will only include frames 1 to 20.
First Ocean Modifier:
Animate the time from 15 to 20
Animate the scale from 0.0 to 3.0
Second Ocean Modifier:
Animate the time from 20 to 25
Animate the scale from 3.0 to 0.0
Since both Modifiers are identical, one starts exactly with the shape the other one ends with. And the scale is used to blend between them.
Set the interpolation in the F-graph Editor to Linear (T) to get a constant motion.
The Geometry of the second modifier must be set to Displace, to avoid overwriting the first.