Three.js:如何在两个对象之间创建过渡？

// 创建场景、相机和渲染器
var scene = new THREE.Scene();
var camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
var renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

// 创建两个几何体对象
var geometry1 = new THREE.BoxGeometry(1, 1, 1);
var material1 = new THREE.MeshBasicMaterial({ color: 0x00ff00 });
var cube1 = new THREE.Mesh(geometry1, material1);
scene.add(cube1);

var geometry2 = new THREE.BoxGeometry(1, 1, 1);
var material2 = new THREE.MeshBasicMaterial({ color: 0xff0000 });
var cube2 = new THREE.Mesh(geometry2, material2);
scene.add(cube2);

// 创建插值器
var positionInterpolator = new THREE.Vector3();
var colorInterpolator = new THREE.Color();

// 设置起始和目标值
var startPosition = new THREE.Vector3(0, 0, 0);
var endPosition = new THREE.Vector3(2, 0, 0);
var startColor = new THREE.Color(0x00ff00);
var endColor = new THREE.Color(0xff0000);

// 动画循环
function animate() {
    requestAnimationFrame(animate);

    // 更新插值器的值
    positionInterpolator.lerpVectors(startPosition, endPosition, 0.5);
    colorInterpolator.lerpColors(startColor, endColor, 0.5);

    // 更新对象的位置和颜色
    cube1.position.copy(positionInterpolator);
    cube2.position.copy(positionInterpolator);
    cube1.material.color.copy(colorInterpolator);
    cube2.material.color.copy(colorInterpolator);

    renderer.render(scene, camera);
}
animate();