This component belongs to the category of the MeshLoaders.
The MeshOBJLoader loads a mesh from a file under the format *.obj. Such a mesh file only supports surface meshes. The *.obj meshes can be generated using softwares like Blender.
No pre-requisite in your scene to use a MeshLoader.
This component is used as follows in XML format:
<MeshOBJLoader name="ObjLoader" filename="mesh/floor3.obj" />
or using SofaPython3:
node.addObject('MeshOBJLoader', name="ObjLoader", filename="mesh/floor3.obj")
An example scene involving a MeshOBJLoader is available in examples/Component/IO/Mesh/MeshOBJLoader.scn