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Floatland structure is vertically-compressed 3D noise. Uses a lacunarity of 1.618 (the golden ratio) for high quality noise. Floatlands appear between user-settable Y limits, with smooth tapering at each limit. Simple user-settable density adjustment. Shadow propagation is disabled in and just below floatlands, no shadows are cast on the world surface. Can be reconfigured to create a solid upper world layer between the Y limits, lakes/seas can be optionally added to this.