shadows

        viewPort.setBackgroundColor(new ColorRGBA(0.87890f, 0.921875f, 0.9375f, 1.0f));

        AmbientLight al = new AmbientLight();
        al.setColor(ColorRGBA.White.mult(1.3f));
        rootNode.addLight(al);

        DirectionalLight sun = new DirectionalLight();
        sun.setColor(ColorRGBA.White);
        sun.setDirection(new Vector3f(-1.0f, -2.0f, -3.0f).normalizeLocal());
        rootNode.addLight(sun);

        final int SHADOWMAP_SIZE = 1024;
        DirectionalLightShadowRenderer dlsr = new DirectionalLightShadowRenderer(assetManager, SHADOWMAP_SIZE, 3);
        dlsr.setLight(sun);
        viewPort.addProcessor(dlsr);