Array<ModelLoader> loaders = ModelLoaderRegistry.loaders.get(extension);
if (loaders == null)
throw new GdxRuntimeException("no loaders for extension '"
+ extension + "'");
Model model = null;
StringBuilder errors = new StringBuilder();
for (int i = 0; i < loaders.size; i++) {
ModelLoader loader = loaders.get(i);
model = loader.load(file, hints);