private Material createPbrMaterial(ColorRGBA color) {
        Material mat = new Material(assetManager, "Common/MatDefs/Light/PBRLighting.j3md");
        mat.setColor("BaseColor", color);
        mat.setFloat("Roughness", 0.8f);
        mat.setFloat("Metallic", 0.1f);
        mat.setBoolean("UseInstancing", true);
        return mat;
    }
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