请问怎么优化模型

我发现3D里有很多不错的模型，并且有不错的软件可以吧3D的专为SketchUp的软件。但原本几KB的模型转换后变成几十KB的，请高手指点如何优化转换的SketchUp模型。


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好的随便一转几十M看着头痛