Can I exert simple Three.js stencil-coloring while clipping a GLTF-object with coded mesh?

Questions
,
1

While taking offset in this Three.js stencil example, …

https://threejs.org/examples/?q=clip#webgl_clipping_stencil

  • that uses a coded torus mesh, and clipping planes, I need to go a step further. As such I wish to expand my clipping-example, by means of a coded BoxGeometry, that clips GLTF.

Found this example:

  • but it only shader-codes the clipping.

Have tried it a this link: ... (click the three dots)
Works - slide downwards to watch how.

The code to reproduce:

    const loader3 = new GLTFLoader().setPath( '.../TJS_Renw/three.js-master/examples/models/renw/' );
            mesh3 = new THREE.Object3D();
            loader3.load( 'DunkelFlaute_05_Cav.gltf', async function ( gltf ) {
            mesh3 = gltf.scene;

           const ldrU1 = genCubeUrls( 'textures/cube/pisa/', '.png' );
           new THREE.CubeTextureLoader().load( ldrU1, function ( ldrCubeMap ) {
                mesh3.traverse((node) => {
                  if (node.isMesh) {
                                  node.material = new THREE.MeshPhongMaterial({
                                        color: "#320", side: THREE.BackSide, transparent: false, roughness: 1.0, metalness: 0.0,   depthTest: true, depthWrite: true, needsUpdate : true
                                  });
                            //  node.material.envMap = ldrCubeMap;
                  }
                });
            });
             mesh3.renderOrder =2;     scene.add( mesh3 );       mesh3.scale.set(5.3,5.3,5.3); 
             mesh3.translateY(0.3);
          } );


        var material4 = new THREE.MeshPhongMaterial();
                        var geometry = new THREE.BoxGeometry( 1, 6, 1 );
          meshBOC = new THREE.Mesh( geometry, material4.clone() );
          meshBOC.material.color.set( 0x0000ff );
          meshBOC.material.colorWrite = false; 
          meshBOC.renderOrder = 6;
          meshBOC.position.x = 0;
          meshBOC.position.y = -3;
          meshBOC.position.z = 0;
          scene.add( meshBOC );

I need a full moveable BoxGeometry to exert clipping. I am looking for a solution, that colors the area, where BoxGeometry clips imported GLTF-file.