ModelInstanceParticleBatch modelInstanceParticleBatch;
public void create () {
if (ui != null) return;
int w = Gdx.graphics.getWidth(), h = Gdx.graphics.getHeight();
modelBatch = new ModelBatch();
environment = new Environment();
environment.add(new DirectionalLight().set(Color.WHITE, 0,0,-1));
worldCamera = new PerspectiveCamera(67, w, h);
worldCamera.position.set(10, 10, 10);