ThreeJS添加后删除线框，返回黑色模型

Question

当前添加线框效果很好。也删除了，除了我的纹理消失了，剩下一个“黑色”模型。

删除线框并将模型恢复到旧状态的正确方法是什么？

function toggleWireframe()
{
    if(wireframe == false) {

        model.traverse(function(child) {
            if (child.isMesh) {

                // Add a mesh which will be used for our wireframe
                let geometry = child.geometry;
                let material = child.material.color = new THREE.Color(0x000000);
                let mesh = new THREE.Mesh(geometry, material);

                mesh.name = 'mesh';
                scene.add(mesh);

                // Setup our wireframe
                const wireframeGeometry = new THREE.WireframeGeometry(geometry);
                const wireframeMaterial = new THREE.LineBasicMaterial({color: 0xFFFFFF});
                const wireframe = new THREE.LineSegments(wireframeGeometry, wireframeMaterial);

                wireframe.name = 'wireframe';
                mesh.add(wireframe);

            }
        });

        wireframe = true;

    } else {

        scene.remove(scene.getObjectByName('mesh'));
        scene.remove(scene.getObjectByName('wireframe'));

        wireframe = false;

    }
}