Hi,
i am writting an ogre exporter. One of my test file seems to be loaded well by Ogre, but not by Irrlicht 3D (using the mesh viewer, nothing is displayed).
Here you can find the .mesh and the .mesh.xml (maybe it can help), and also the .material
http://texel3d.free.fr/bugs/ogre_bug.zip
PS: I am not an expert in the ogre file format, maybe my file is not well exported, but it seems to work with Ogre.