const mtlLoader = new MTLLoader( manager );
  mtlLoader.setPath('../models/');
  mtlLoader.load('spctr_room.mtl', (materials) => {
    materials.preload();
    const objLoader = new OBJLoader();
    objLoader.setMaterials(materials);
    objLoader.setPath('../models/');
    objLoader.load('spctr_room.obj', (object) => {
      object.receiveShadow = true;
      object.castShadow = true;
      const mesh = object;
      scene.add(mesh);
      mesh.traverse(function (child) {
        console.log(child)
        child.castShadow = true
        child.receiveShadow = true
      });
    });