3d模型一般怎么导入到到Threejs中使用

function loadBuild() {
        var loader = new THREE.OBJLoader();
        var mtlLoader = new THREE.MTLLoader();

        mtlLoader.setPath( "city/" );
        mtlLoader.load(‘house.mtl‘, (mtl) => {
          mtl.preload();
          loader.setMaterials(mtl);
          loader.setPath("city/");
          // load a resource
          loader.load(
            // resource URL
            ‘house.obj‘,
            function ( object ) {
              const renderingParent = new THREE.Group();
              renderingParent.scale.set(0.3, 0.3, 0.3);

              renderingParent.add(object);
              scene.add( renderingParent );
            }
          );
        });
      }