threejs以第一人称进行人物漫游，以wasd来控制人的模型，不使用PointerLockControls，需要碰撞检测。可以使用插件

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我想在threejs以第一人称进行人物漫游，以wasd来控制人的模型。如何做，不适用PointerLockControls，需要碰撞检测。可以使用插件。

要在Three.js中实现第一人称的人物漫游，并使用WASD键进行控制，您可以考虑使用cannon.js作为物理引擎来处理碰撞检测。以下是一个简单的实现方法：

1. 首先，导入相关库：

html

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/cannon/0.6.2/cannon.min.js"></script>

2. 设置场景、摄像机、渲染器、光源：

javascript

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);

const renderer = new THREE.WebGLRenderer();
renderer.setSize(window.innerWidth, window.innerHeight);
document.body.appendChild(renderer.domElement);

const directionalLight = new THREE.DirectionalLight(0xffffff, 0.5);
directionalLight.position.set(1, 1, 1);
scene.add(directionalLight);

const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
scene.add(ambientLight);

3. 初始化Cannon.js物理世界：

javascript

const world = new CANNON.World();
world.gravity.set(0, -9.82, 0);
world.broadphase = new CANNON.NaiveBroadphase();
world.solver.iterations = 10;

4. 创建玩家对象并添加碰撞检测：

javascript

const playerShape = new CANNON.Sphere(1);
const playerBody = new CANNON.Body({ mass: 5 });
playerBody.addShape(playerShape);
playerBody.position.set(0, 1, 0);
world.addBody(playerBody);

5. 创建地面对象并添加碰撞检测：

javascript

const groundShape = new CANNON.Plane();
const groundBody = new CANNON.Body({ mass: 0 });
groundBody.addShape(groundShape);
groundBody.quaternion.setFromAxisAngle(new CANNON.Vec3(1, 0, 0), -Math.PI / 2);
world.addBody(groundBody);

const groundMaterial = new THREE.MeshStandardMaterial({ color: 0x00ff00 });
const groundGeometry = new THREE.PlaneGeometry(50, 50);
const groundMesh = new THREE.Mesh(groundGeometry, groundMaterial);
groundMesh.rotation.x = -Math.PI / 2;
scene.add(groundMesh);

6. 添加WASD键控制：

javascript

const keys = { W: false, A: false, S: false, D: false };

document.addEventListener('keydown', (event) => {
    if (event.key in keys) {
        keys[event.key] = true;
    }
});

document.addEventListener('keyup', (event) => {
    if (event.key in keys) {
        keys[event.key] = false;
    }
});

function updatePlayerMovement() {
    const speed = 5;
    const moveForward = new THREE.Vector3();
    const moveSide = new THREE.Vector3();
    const cameraDirection = camera.getWorldDirection(moveForward).normalize();
    const cameraSide = camera.getWorldDirection(moveSide).normalize().cross(camera.up);

    if (keys.W) {
        playerBody.velocity.x  = cameraDirection.x * speed;
        playerBody.velocity.z  = cameraDirection.z * speed;
    }
    if (keys.S) { playerBody.velocity.x -= cameraDirection.x* speed; 
    playerBody.velocity.z -= cameraDirection.z* speed; }
     if (keys.A) { playerBody.velocity.x -= cameraSide.x* speed; 
     playerBody.velocity.z -= cameraSide.z* speed; } 
     if (keys.D) { playerBody.velocity.x  = cameraSide.x* speed; 
     playerBody.velocity.z  = cameraSide.z* speed; } }

function updateCameraPosition() { 
// 调整相机高度 
camera.position.copy(playerBody.position); camera.position.y  = 1.6;
 }

7. 创建一个循环函数来更新场景和物理模拟：

const clock = new THREE.Clock();

function animate() {
    requestAnimationFrame(animate);

    const delta = clock.getDelta();
    world.step(delta);

    updatePlayerMovement();
    updateCameraPosition();

    renderer.render(scene, camera);
}

animate();

这个实现方法可以让您在Three.js场景中实现第一人称漫游，并使用WASD键进行控制。同时使用Cannon.js物理引擎处理碰撞检测。请注意，这只是一个简化的示例，您可以根据需要添加更多的功能，例如墙壁、物体等，以使场景更加丰富。

https://threejs.org/examples/?q=fps#games_fps

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