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js 实现ar

2026-04-05 09:45:55JavaScript

JavaScript 实现 AR（增强现实）的方法

使用 WebXR API

WebXR 是浏览器中实现 AR/VR 的标准 API，支持设备传感器和摄像头输入。

js 实现ar

navigator.xr.requestSession('immersive-ar').then((session) => {
  session.requestReferenceSpace('local').then((refSpace) => {
    const renderLoop = (time, frame) => {
      const pose = frame.getViewerPose(refSpace);
      if (pose) {
        // 渲染 AR 内容
      }
      session.requestAnimationFrame(renderLoop);
    };
    session.requestAnimationFrame(renderLoop);
  });
});

通过 Three.js + AR.js

AR.js 是基于 Three.js 的轻量级 AR 库，支持标记识别和位置追踪。

js 实现ar

import * as THREE from 'three';
import { ARjs } from 'ar.js';

const scene = new THREE.Scene();
const camera = new THREE.Camera();
const renderer = new THREE.WebGLRenderer({ antialias: true });

const arToolkitSource = new ARjs.Source({
  sourceType: 'webcam',
});
const arToolkitContext = new ARjs.Context({
  cameraParametersUrl: 'data/camera_para.dat',
  detectionMode: 'mono',
});
arToolkitContext.init(() => {
  camera.projectionMatrix.copy(arToolkitContext.getProjectionMatrix());
});

const markerRoot = new ARjs.MarkerControls(arToolkitContext, markerGroup, {
  type: 'pattern',
  patternUrl: 'data/patt.hiro',
});

使用 8th Wall

8th Wall 提供跨平台的 WebAR 解决方案，支持 SLAM 和图像识别。

<script src="https://cdn.8thwall.com/web/aframe/8frame-1.1.0.min.js"></script>
<script src="https://cdn.8thwall.com/web/xrextras/xrextras.js"></script>

<a-scene xrextras-almost-there xrextras-runtime-error xrextras-gesture-detector>
  <a-camera></a-camera>
  <a-entity xrextras-named-image-target="targetName: example"></a-entity>
</a-scene>

基于 TensorFlow.js 的物体识别

结合机器学习实现无标记 AR 体验。

const model = await tf.loadGraphModel('model.json');
const video = document.getElementById('webcam');

const detectObjects = async () => {
  const tensor = tf.browser.fromPixels(video);
  const predictions = await model.executeAsync(tensor);
  // 处理识别结果并叠加 AR 内容
  requestAnimationFrame(detectObjects);
};