Encountered a really strange problem with a model I've loaded into XNA. Some parts of the model have exploded or translated and rotated away from their correct positions, and at least half of the model isn't displaying at all. I wondering if there is some really banal reason for this problem, if it's something that people have encountered before? Perhaps it's something to do with the export settings (.fbx from Maya), or if it's a consequence of using the BasicEffect shader to render it. In any case, any advice on what might be causing this problem? The code has worked with other models (though this is the first model I didn't download), so I'm assuming the problem is with the model.