Here’s an even easier way!
-
Make your clothsim the way you want.
-
Select your object and go to
File > Export > Alembic (.abc)
. Make sure to selectOnly Selected Objects
-
Go to
File > Import > Alembic (.abc)
and import your file you just exported. -
Select
Override Frame
and add a keyframe on frame 0, setting the Override Frame to 150. add a keyframe at frame 150 as frame 1.
-
In the dope sheet (found in the Animation workspace tab by default), set the keyframe interpolation to Linear. Disable Only Show Selected button (is this a bug?)
-
Enjoy your reversed animation!