在使用Threejs代码构建的展厅中，需要在一面墙中间挖个洞作为门或窗户，效果如下：

引入ThreeBSP.js

<script src="plugins/three/ThreeBSP.js"></script>

创建

    // 1 定义墙面
    var cubeGeometry = new THREE.BoxGeometry(184.8, 40, 2.4);
    var cube = new THREE.Mesh(cubeGeometry);
    // 2 定义窗户门
    var door = new THREE.BoxGeometry(60, 35, 2.4);
    var doorMesh = new THREE.Mesh(door);
    doorMesh.position.y = -8
    // 3 定义两个bsp对象
    var cubeBSP = new ThreeBSP(cube);
    var doorBSP = new ThreeBSP(doorMesh);
    // 4 取交集
    let resultBSP = cubeBSP.subtract(doorBSP); // 墙体挖窗户门
    // 5 将相交的部分转换成Mesh
    let result = resultBSP.toMesh();
    // 6 转成geometry
    var cubeGeometry = result.geometry
    var cubeMaterial = [
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),  //右
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),  //上 
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),
        new THREE.MeshBasicMaterial({ color: 0xe9e9e9 }),
    ]
    // 7 重新生成一个mesh 
    let wallMesh = new THREE.Mesh(cubeGeometry, cubeMaterial);
    wallMesh.position.set(0, 5, 71.8)
    scene.add(wallMesh);

即实现在墙体上挖个洞作为门或窗户

其中ThreeBSP.js下载地址：https://download.csdn.net/download/qq_33298964/89400806