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1.效果

2.微信小程序手势识别只支持以下几个动作，和识别点位，官方文档
因为AR识别手部一直在识别，所以会出现闪动问题。可以将微信开发者调试基础库设置到3.3.2以上，可能要稳定一些

3.3.代码展示，我用的是微信官方文档案例demo框架。官方文档demo

4.代码展示，在组件里先创建xr-ar-german组件

index.wxml

<!-- 手势识别 -->
<xr-scene ar-system="modes:Hand" bind:ready="handleReady" bind:ar-ready="handleARReady"><xr-assets bind:progress="handleAssetsProgress" bind:loaded="handleAssetsLoaded"><!-- D仔模型 --><!-- <xr-asset-load type="gltf" asset-id="miku2" src="模型"/> --><xr-asset-load type="gltf" asset-id="miku2" src="https://cyvideo.i-oranges.com/ar/ds2024/67.glb"/></xr-assets><xr-env env-data="xr-frame-team-workspace-day"/><!-- D仔模型位置调整 9 5 13 7 0 1 2 12 6 7 10 11 8 4 14 15 16 17 18 19 20 3--><xr-node wx:if="{{arReady}}"><xr-ar-tracker id='tracker' mode="Hand" auto-sync="9"><!-- <xr-gltf id="wxball-2" model="miku2"anim-autoplay scale="0.12 0.12 0.12" rotation="0 180 0"bind:gltf-loaded="handleGLTFLoaded"  wx:if="{{modeShow}}"/> --><xr-gltf id="wxball-2" model="miku2"anim-autoplay scale="0.12 0.12 0.12" position="0 0 -1"rotation="10 180 0"bind:gltf-loaded="handleGLTFLoaded"  wx:if="{{modeShow}}"/></xr-ar-tracker><!-- AR相机 --><xr-cameraid="camera"  target="miku2"  node-id="camera" clear-color="0.925 0.925 0.925 1"background="ar" is-ar-camera  near="0.0001"  position="2 1 10"></xr-camera></xr-node><xr-node node-id="lights"><!-- <xr-light type="ambient" color="1 1 1" intensity="2.5" /> --><xr-light type="ambient" color="1 1 1" intensity="2.9" /><!-- 点光源 --><!-- <xr-light type="point" position="0 0 0" color="1 1 1" range="30" intensity="10" /> --></xr-node>
</xr-scene>

index.js

Component({behaviors: [require('../common/share-behavior').default],data: {loaded: false,arReady: false,modeShow: false, //模型展示默认不展示falseisplay: true,modeShowOne: false,time:null,//定时器},methods: {// 模型加载完毕handleGLTFLoaded({detail}) {},handleReady({detail}) {const xrScene = this.scene = detail.value;// 显示加载中提示wx.showLoading({title: '加载中',mask: true // 是否显示透明蒙层，防止用户点击其他区域})xrScene.event.add('tick', this.handleTick.bind(this));},handleAssetsProgress: function ({detail}) {console.log('组件进度', detail.value);//组件进度 detail.value.progress == 1组件加载完毕},handleAssetsLoaded: function ({detail}) {// console.log('assets loaded', detail.value);// 隐藏加载中提示wx.hideLoading()this.setData({loaded: true});},handleARReady: function ({detail}) {// console.log('arReady');this.setData({arReady: true});},handleTick: function () {let that = this;const xrSystem = wx.getXrFrameSystem();const trackerEl = this.scene.getElementById('tracker');if (!trackerEl) {return;}const tracker = trackerEl.getComponent(xrSystem.ARTracker);console.log('识别到手了',this.data.isplay,'====',tracker.arActive)
//tracker.arActive = true  代表识别到了手部任何部位if (!tracker.arActive) {// this.setData({//   isplay:true// })return}// 这里只是例子，实际上用的是`ARTracker`的`autoSync`属性。// 但也是一个更高自由度的选项。// 视情况需要自己同步`tracker`的`scale`和`rotation`特定节点。// 第一个参数是特征点编好，第二个是可选的复用结果，第三个是可选的是否相对于`ARTracker`。// 为`false`为世界空间的位置，需要配合`scale`自己使用const position = tracker.getPosition(98, new xrSystem.Vector3(), false);// 获取手势姿态，详见官网const gesture = tracker.gesture;//识别成功显示D仔模型在手上  gesture==1手掌识别if (gesture == 1) {console.log('显示D仔11', this.data.isplay);// 判断是否新用户需要进来引导画面  1表示需要wx.setStorageSync('gestureOne', 1);//显示模型this.setData({modeShow: true})if (this.data.isplay) {this.data.time = setTimeout(() => {console.log("暂停动画了");//暂停手势模型动画let animator1 = that.scene.getElementById('wxball-2').getComponent("animator");animator1.pause();}, 4000)this.setData({isplay: false})}} else {console.log('没有识别到手掌');this.setData({modeShow: false, //隐藏模型isplay: true //默认未识别到手的时候初始化动画})//清除定时器clearTimeout(this.data.time);}// 获取总体置信度const score = tracker.score;this.triggerEvent('info', {gesture,score});}}
})

index.json

{"component": true,"renderer": "xr-frame"
}

5.创建父组件scene-ar-germanBusiness，引入手势识别子组件
在这里插入图片描述

index.WXML

<view wx:if="{{gestureShow==1}}"><xr-demo-viewer><xr-ar-german  disable-scroll id="main-frame" width="{{renderWidth}}"height="{{renderHeight}}" style="width:{{width}}px;height:{{height}}px;top:{{top}}px;left:{{left}}px;display:block;" bind:info="handleInfo" bind:arTrackerState="handleARTrackerState" /></xr-demo-viewer>
</view>

index.json

{"usingComponents": {"xr-demo-viewer": "../../../components/xr-demo-viewer/index",//官方文档案例有，复制过来"xr-ar-german": "../../../components/xr-ar-german/index",},"disableScroll": true
}

index.js

var sceneReadyBehavior = require('../../behavior-scene/scene-ready');
var handleDecodedXML = require('../../behavior-scene/util').handleDecodedXML;
var xmlCode = ``;
Page({moveTimes: 0,behaviors: [sceneReadyBehavior],data: {},handleInfo: function ({detail}) {console.log('模型出来了',detail)this.setData({gesture: detail.gesture,score: detail.score.toFixed(2)});if (this.data.gesture === 1) {wx.showToast({title: '识别成功',icon: 'none',duration: 200}); // setTimeout(res=>{//  this.setData({//    horizontalShow:false,//隐藏引导//   })//  },100)//  setTimeout(res => {//   this.setData({//    tipsTu: false,//    progessShow: false,//    })//    }, 2000)} else {//没有识别到//  this.setData({//    progessShow: false//  })}},handleARTrackerState: function ({datail}) {console.log('模形出来了吗',detail)},
})

最终效果