thanks for the reply, the one which is attached with the pole is a static mesh i just simulated it with 3ds max as a cloth it didn’t moves, but the other one is the flag with the apex cloth i tried to make a new project ,imported the flag then make a Matenne nd it worked and i got an output video with the moving flag but in my main project i still got the same problem i think that i ll copy the hole scene to a new project and by the way im using 4.7 thanks