public static void main(String[] args) {
        TestInstanceNodeWithPbr app = new TestInstanceNodeWithPbr();
        app.start();
    }
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