写一个theejs摄像相机不管怎么旋转 面始终朝向摄像机
时间: 2024-09-20 12:08:12 浏览: 54
在TheeJS(基于Three.js的模板引擎)中,创建一个始终保持朝向摄像机的3D模型,通常涉及到使用方向向量和对象的旋转控制。以下是一个简单的示例,展示如何让一个3D摄像机对象的正面始终对准场景中的目标:
首先,确保你已经安装了TheeJS并熟悉基本用法。然后,你可以创建一个类或组件来表示这个摄像机,让它继承自Three.js的`PerspectiveCamera`或`OrthographicCamera`。
```javascript
// 引入TheeJS和Three.js库
const Thee = require('theejs');
const { PerspectiveCamera } = THREE;
class CameraWithRotation {
constructor(position, target) {
// 初始化基础的摄像机对象
this.camera = new PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
this.position = position;
this.target = target; // 目标位置
// 让摄像机的视图轴始终指向目标
this.updateDirection();
}
updateDirection() {
// 更新摄像机的方向向量
const direction = this.target.clone().sub(this.position).normalize();
this.camera.up.set(0, 1, 0); // 假设摄像机默认上向
this.camera.lookAt(this.position.add(direction)); // 保持摄像机看向目标
}
rotateAroundTarget(angle, axis = 'x') {
// 在指定轴上围绕目标旋转
if (axis === 'x') {
this.rotation.y += angle;
} else if (axis === 'y') {
this.rotation.x += angle;
} // 添加更多轴的支持
this.updateDirection(); // 旋转后更新方向
}
}
// 创建一个新的摄像机实例并添加到场景中
const camera = new CameraWithRotation(new THREE.Vector3(0, 0, -1), new THREE.Vector3(0, 0, 0));
scene.add(camera);
```
在这个例子中,`updateDirection()`方法负责根据摄像机的位置和目标调整其方向。当你调用`rotateAroundTarget()`时,可以根据需要在特定轴上旋转摄像机,但它的正面仍然会保持对准目标。
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