OgreAssimp is a command-line tool to convert models to OGRE format
Download :
https://ci.appveyor.com/api/projects/AnotherFoxGuy/ogre-assimp/artifacts/OgreAssimp.zip
Usage:
1. Download and unzip OgreAssimp.zip somewhere
2. Export the 3D model from your favourite 3D editor in one of the following formats:
AMF 3DS AC ASE ASSBIN B3D BVH COLLADA DXF CSM HMP IRRMESH IRR LWO LWS M3D MD2 MD3 MD5 MDC MDL NFF NDO OFF OBJ OGRE OPENGEX PLY MS3D COB BLEND IFC XGL FBX Q3D Q3BSP RAW SIB SMD STL TERRAGEN 3D X X3D GLTF 3MF MMD
3. Drag and drop your 3D model onto the OgreAssimpConverter.exe executable
4. That's it! OgreAssimp now should have created a mesh file and a material that you can use in RoR