Ok, but Dr Geep, the landing craft is travelling over the surface of the "Poser Ground". So if I do this to the magnet, and make the shape of the polygon (New Group) exactly fit the shape of the boat, and parent the magnet to the boat, and the boat moves over the water, this zone will follow the boat and affect the new polygons coming under the boat? And excuse my ignorance, how do I make the depression negative. I want the water down, not up. (PS I now regret not doing your magnet tutotial, lol)

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