---Game.java---

package com.yaakov.mars;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.g3d.ModelBatch;
import com.badlogic.gdx.graphics.g3d.Environment;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.g3d.Material;
import com.badlogic.gdx.graphics.g3d.Model;
import com.badlogic.gdx.graphics.g3d.ModelInstance;
import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute;
import com.badlogic.gdx.graphics.g3d.attributes.TextureAttribute;
import com.badlogic.gdx.graphics.g3d.utils.ModelBuilder;
import com.badlogic.gdx.math.Vector3;
import com.yaakov.mars.Martian;
import com.yaakov.mars.Render;

public class Game extends ApplicationAdapter{
	PerspectiveCamera camera;
	AssetManager assetManager;
	Render render;
	ModelBuilder modelBuilder;
	ModelBatch batch;
	Model box;
	ModelInstance boxInstance;
	Environment environment;
	Material material;

	@Override
	public void create(){
		batch = new ModelBatch();
		//assetManager = new AssetManager();
		render = new Render();
		modelBuilder = new ModelBuilder();

		//assetManager.load("badlogic.jpg", Texture.class);
		render.load("badlogic.jpg", Texture.class);
		while(!render.update()){
			float progress = assetManager.getProgress();
			System.out.println(progress);
		}
		//Texture texture = assetManager.get("badlogic.jpg", Texture.class);
		material = new Material(TextureAttribute.createDiffuse(texture));

		box = modelBuilder.createBox(2f, 2f, 2f, material, Usage.Position|Usage.Normal|Usage.TextureCoordinates);
		boxInstance = new ModelInstance(box, 0.f, 0.f, 0.f);

		environment = new Environment();
		environment.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.8f, 0.8f, 0.8f, 1.0f));
		//environment.add(new DirectionalLight().set(0.8f, 0.8f, 0.8f, -1.f, -0.8f, -0.2f));

		camera = new PerspectiveCamera(75, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
		camera.position.set(0.f, 0.f, 3.f);
		camera.lookAt(0.f, 0.f, 0.f);;
		camera.near = 0.1f;
		camera.far = 300.f;
	}

	@Override
	public void dispose(){
		box.dispose();
		batch.dispose();
	}

	@Override
	public void render() {
		Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
		Gdx.gl.glClearColor(1,  1,  1,  1);
		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT|GL20.GL_DEPTH_BUFFER_BIT);

		camera.rotateAround(Vector3.Zero, new Vector3(0.f, 1.f, 0.f), 1.f);
		camera.update();

		batch.begin(camera);
		batch.render(boxInstance, environment);
		batch.end();
	}

	@Override
		public void resize(int width, int height){
	    }

	@Override
		public void pause(){
		}

	@Override
		public void resume(){
		}
}

--Render.java--
package com.yaakov.mars;

import com.badlogic.gdx.assets.AssetManager;

public class Render{
	private AssetManager manager;

	public synchronized <T> void load (String fileName, Class<T> type) {
		manager.load(fileName, type);
	}

	public synchronized <T> T get (String fileName, Class<T> type) {
		return manager.get(fileName, type);
	}

	public boolean update(){
		return manager.update();
	}
}