hey I did it exactly this way, but the airfield doesn't affect the grass.. don't know.. And there's another Problem. I just don't get it how to move the plane with the grass and hair system. When I parent it I always multiple parenting problems (hair system moves faster), although theres just single parenting. Anothinger thing that's weird is, the grass is within a glass sphere, but when the camera is outside of the sphere you can't see the grass? Thank you!