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Change A Material Parameter During Game Play

Is it possible to change a materials parameter like the applied wind speed to grass while the game is being played? If so how?

It requires exposing parameters and creating material instances. Here are a few tutorials on it that may help you out a bit.
https://youtube.com/watch?v=i2XmTbfIJ3shttps://forums.unrealengine.com/showthread.php?1403-Material-parameter-animation-Matinee-not-working

ok. thanks.