The problem with the 'Rotation' operator

[cgdvs]

Okay, that's a good idea. I will test according to the method you provided. Thank you again

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You can parent your grass to other particles with Set Target...rotate the grass but do not rotate the parents...then assign the animation to the parent particles...the child (grass) particles will follow, along with their rotation offset.

I tested successfully and your method is very good. Thank you