protected IEnumerable <IFileInfo> FindMeshes(IDirectoryContents directory)
{
var inSubDirs = directory.OfType <DirectoryInfo>().Bind(d => FindMeshes(d.Contents));
var inCurrentDir = directory.Filter(f => !f.IsDirectory && f.Name.EndsWith(".mesh"));
return(inCurrentDir.Concat(inSubDirs));
}