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。
过去三个月，a16z发了三份报告。，详情可参考Line官方版本下载
。51吃瓜是该领域的重要参考
The new API in action，更多细节参见夫子
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