我是用鼠标绘制图形的，在鼠标拖动修改顶点坐标的时候图形不跟随更新？求大牛帮忙？
这个是我绘制时的函数
function drawBox(arr) {

        var cubeGeometry = new THREE.Geometry();
        var start = arr[0].clone();
        var end = arr[1].clone();
        var vertices = [
            new THREE.Vector3(end.x, end.y, start.z),
            new THREE.Vector3(start.x, start.y, start.z),
            new THREE.Vector3(start.x, start.y, end.z),
            new THREE.Vector3(end.x, end.y, end.z)
        ]
        cubeGeometry.vertices = vertices;
        var faces = [
            new THREE.Face3(0, 1, 2),
            new THREE.Face3(0, 2, 3)
        ]
        cubeGeometry.faces = faces;
        cubeGeometry.computeFaceNormals();
        var cubeMaterial = new THREE.MeshBasicMaterial({ color: 0x00ffff, wireframe: true });
        var cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
        cube.geometry.verticesNeedUpdate = true;
        scene.add(cube);
        currentBox = cube;
    }

这是我修改顶点坐标时的函数
function modifyBox(arr) {

        let start = arr[0].clone();
        let end = arr[1].clone();
        var vertices = [
            new THREE.Vector3(end.x, end.y, start.z),
            new THREE.Vector3(start.x, start.y, start.z),
            new THREE.Vector3(start.x, start.y, end.z),
            new THREE.Vector3(end.x, end.y, end.z)
        ]
        currentBox.geometry.verticesNeedUpdate = true;
        currentBox.geometry.vertices = vertices;
        currentBox.geometry.computeVertexNormals()
        var faces = [
            new THREE.Face3(0, 1, 2),
            new THREE.Face3(0, 2, 3)
        ]
        currentBox.geometry.faces = faces;
        currentBox.geometry.computeFaceNormals();
        currentBox.geometry.verticesNeedUpdate = true;
    }