This specific 3D model, "Curtain Low-poly 3D model 100", is an asset made available by "Unknown author".
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OBJ (OBJ, filesize: 4.38 MB), FBX (Autodesk FBX, filesize: 4.77 MB), BLEND (Blender, filesize: 5.68 MB), GLTF (glTF, filesize: 3.21 MB)