Adding createModelLibShader to PbrMaterialSetup so MRT overrides can be handled in the same class.

h3d/mat/PbrMaterialSetup.hx

@@ -25,6 +25,12 @@ class PbrMaterialSetup extends MaterialSetup {
 		return @:privateAccess new PbrMaterial();
 	}
 
+	#if hide
+	public function createModelLibShader() {
+		return new hrt.prefab.l3d.ModelLibrary.ModelLibShader();
+	}
+	#end
+
 	public static function set() {
 		MaterialSetup.current = new PbrMaterialSetup();
 	}