void ExportModel(string file_name)
        {
            ModelInfoInternal model_info = new ModelInfoInternal();

            List <int> added_permutations = new List <int>();

            // create an info object with all of the registered infos combined
            foreach (int index in registeredInfos)
            {
                ModelInfoInternal info = internalInfoList[index] as ModelInfoInternal;

                if (!added_permutations.Contains(info.Permutation))
                {
                    added_permutations.Add(info.Permutation);
                }

                for (int i = 0; i < info.GetShaderCount(); i++)
                {
                    model_info.AddShaderDatum(info.GetShaderDatum(i), info.GetShaderName(i));
                }
                for (int i = 0; i < info.GetGeometryCount(); i++)
                {
                    model_info.AddGeometry(info.GetGeometryName(i), info.GetGeometryIndex(i));
                }
            }

            if (added_permutations.Count == 1)
            {
                model_info.Permutation = added_permutations[0];
            }
            else
            {
                model_info.IsMultiplePermutations = true;
            }

            ColladaExportArgs arguments = new ColladaExportArgs(Overwrite, RelativeFilePath, BitmapFormat);
            var exporter = new Halo1.ColladaModelExporter(arguments, model_info, tagIndex, tagManager);

            ExportSave(exporter, RelativeFilePath + file_name + ".dae");
        }