@Override
    public void simpleInitApp() {
        configureCamera();
        bmp = createLabelText(10, 20, "<placeholder>");
        
        InstancedNode instancedNode = new InstancedNode("InstancedNode");
        rootNode.attachChild(instancedNode);

        Box mesh = new Box(0.5f, 0.5f, 0.5f);
        box = new Geometry("Box", mesh);
        Material pbrMaterial = createPbrMaterial(ColorRGBA.Red);
        box.setMaterial(pbrMaterial);

        instancedNode.attachChild(box);
        instancedNode.instance();

        DirectionalLight light = new DirectionalLight();
        light.setDirection(new Vector3f(-1, -2, -3).normalizeLocal());
        rootNode.addLight(light);
    }
This test specifically validates the corrected PBR rendering when combined
with instancing, as addressed in issue #2435. 

It creates an InstancedNode
with a PBR-materialized Box to ensure the fix in PBRLighting.vert correctly
handles world position calculations for instanced geometry.
jme3-examples/src/main/java/jme3test/scene/instancing/TestInstanceNodeWithPbr.java