这个真实地点生成效果为什么值得看
Manhattan, New York, United States 作为“标志性高密度城市”案例展示：用 OpenStreetMap 数据重建真实地点，让用户先看到效果，再生成自己的区域。
The grid makes navigation and orientation obvious.
Dense city data produces a rich 3D preview.
The familiar skyline context makes the result easy to understand quickly.
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