Unity 3d Model Format. You can import only the parts of the model you need instead of importing the whole model into unity. Unity can read fbx dae collada 3ds dxf and obj files.
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Unity can read fbx dae collada 3ds dxf obj and skp files. Unreal engine 3d modeling. Meshes make up a large part of your 3d worlds.
The process of creating a 3d model for unity.
Refer to your 3d modeling software documentation for information about exporting 3d files. Instead of importing the whole model into unity you can import only the parts of the model you need. In the project view the main imported object is a model prefab. For information about exporting 3d files see exporting from other applications or read the documentation for your 3d modeling software.