input.getClips().setMissCallback(new MissingCallback<String, AnimationClip>() {
public AnimationClip getValue(final String key) {
if (!animationStore.containsKey(key)) {
try {
final ColladaStorage storage1 = new ColladaImporter().load("collada/skeleton/" + key + ".dae");
animationStore.put(key, storage1.extractChannelsAsClip(key));
} catch (final IOException e) {
e.printStackTrace();
animationStore.put(key, null);
}
}