这个真实地点生成效果为什么值得看
Hamburg, Germany 作为“港口城市”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。
Waterfront edges create a clear visual boundary in the generated world.
Dense roads and blocks make the area readable from above.
The port-city mix makes the preview feel different from an inland downtown.
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