@Override
    public void simpleUpdate(float tpf) {
        pos += tpf * vel;
        if (pos < -10f || pos > 10f) {
            vel *= -1;
        }
        box.setLocalTranslation(pos, 0f, 0f);
        bmp.setText(String.format(Locale.ENGLISH, "BoxPosition: (%.2f, %.1f, %.1f)", pos, 0f, 0f));
    }
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