I’ve looked and compared both xml files, or the options of the ogreXML (I’m pretty sure I exported both the same way) and I can’t figure out what is the difference. I didn’t create the mesh myself in blender so I don’t discard there’s a difference in blender but it should be visible in the xml file
Yep, normals are part of a mesh data. In blender you can have blender calculate normals interpolated (smooth) or constant (flat). The normals are used in the lighting calculation in the standard shader.