想象一下，你用饼干模具在面团上按了一下，这就是 ExtrudeGeometry 做的事。
这里用的是 平行光，模拟太阳光。
。Line官方版本下载对此有专业解读
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The library project, on the other hand, contains the actual core gameplay logic. In the inventory service's case, this includes the C# classes that model the request and response for every API operation as well as the underlying logic for handling the countless inventory related systems such as crafting, quests, loot, etc. As a separate project, the library can be imported in other services when we need to reuse that logic without pulling in any of the web project's code.