通常,stl/obj/asc格式的3D数据是最常用的3D数据格式。stl格式没有颜色纹理,obj格式有颜色纹理。保存obj文件时,会同时保存3个文件:obj、mtl和png。没有mtl和png,obj等于stl,是没有颜色纹理的。mtl 文件就像一座桥梁,连接obj和png。
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