Mindar.JS使用方式
注意：此篇文章需要启动https才可调用相机权限
图像追踪示例
- 需要用到两个js库
html
<script src="./js/aframe.min.js"></script>
<script src="./js/mindar-image-aframe.prod.js"></script>- 下面看一下标签结构
这里是默认配置
js
document.addEventListener("DOMContentLoaded", function () {
const sceneEl = document.querySelector('a-scene');
let arSystem;
sceneEl.addEventListener('loaded', function () {
// alert('执行')
arSystem = sceneEl.systems["mindar-image-system"];
});
const startButton = document.querySelector("#example-start-button");
startButton.addEventListener('click', () => {
console.log("start");
arSystem.start(); // start AR
arSystem.pause(true);
});
sceneEl.addEventListener("arReady", (event) => {
alert('AR引擎已启动')
});
sceneEl.addEventListener("arError", (event) => {
alert('相机未启动成功！')
});
});上面图片提到需要一个Mind文件，这个文件就是图像识别的图片，工具在这里图像目标编辑器
图像目标编辑器
如果是图片识别显示图片的话就很简单了
关于渲染视频
如果我想扫描图片展示视频该如何去操作呢？
我这里加了两张png图片用来做暂停按钮
我这里按顺序称谓opc.png背景，2.png按钮
当我们点击背景时让视频暂停，并让按钮层级往内移动 或者 让按钮隐藏
再次点击背景让视频播放，让按钮显示
js
const portfolio = document.querySelector("#portfolio-panel");
const paintandquestPreviewButton = document.querySelector("#paintandquest-preview-button");
const paintandquestPreviewButton2 = document.querySelector("#paintandquest-preview-button2");
portfolio.setAttribute("visible", true);
let y = 0;
let status = false;
paintandquestPreviewButton.addEventListener('click', () => {
if (status == false) {
// paintandquestPreviewButton.setAttribute("visible", false);
const testVideo = document.createElement("video");
const canplayWebm = testVideo.canPlayType('video/webm; codecs="vp8, vorbis"');
if (canplayWebm == "") {
document.querySelector("#paintandquest-video-link").setAttribute("src", "#paintandquest-video-mp4");
document.querySelector("#paintandquest-video-mp4").play();
} else {
paintandquestPreviewButton2.setAttribute("visible", false);
document.querySelector("#paintandquest-video-link").setAttribute("src", "#paintandquest-video-mp4");
document.querySelector("#paintandquest-video-mp4").play();
// alert('播放')
status = true
}
} else {
paintandquestPreviewButton2.setAttribute("visible", true);
// alert('暂停')
// portfolio.setAttribute("visible", true);
document.querySelector("#paintandquest-video-mp4").pause();
status = false;
}
});
portfolio.setAttribute("position", "0 " + y + " -0.01");完整代码：
html
<!--
* @Description:
* @Autor: Southern Wind
* @Date: 2023-07-25 11:21:40
* @LastEditors: Southern Wind
* @LastEditTime: 2023-07-25 12:00:42
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>AR相机</title>
<script src="./js/aframe.min.js"></script>
<script src="./js/mindar-image-aframe.prod.js"></script>
<script src="./js/vconsole.min.js"></script>
</head>
<body>
<div style="position: absolute; z-index: 1000">
<button id="example-start-button">重新加载</button>
</div>
<a-scene mindar-image="imageTargetSrc: ./targets.mind;" vr-mode-ui="enabled: false" device-orientation-permission-ui="enabled: false">
<a-assets>
<img id="paintandquest-preview" src="./images/opc.png" />
<img id="paintandquest-preview2" src="./images/2.png" />
<video id="paintandquest-video-mp4" autoplay="false" loop="true" src="./1234.mp4" playsinline webkit-playsinline></video>
</a-assets>
<a-camera position="0 0 0" look-controls="enabled: false" cursor="fuse: false; rayOrigin: mouse;" raycaster="far: 10000; objects: .clickable"></a-camera>
<a-entity mindar-image-target="targetIndex: 0" mytarget>
<a-entity visible=false id="portfolio-panel" position="0 0 -0.01">
<a-image id="paintandquest-preview-button" class="clickable" src="#paintandquest-preview" alpha-test="0.5" position="0 0 0.1" height="0.552" width="1">
</a-image>
<a-image id="paintandquest-preview-button2" class="clickable" src="#paintandquest-preview2" alpha-test="0.5" position="0 0 0.05" height="0.552" width="1">
</a-image>
<a-video id="paintandquest-video-link" webkit-playsinline playsinline width="1" height="0.552" position="0 0 0"></a-video>
</a-entity>
</a-entity>
</a-scene>
<script>
const vConsole = new VConsole()
console.log(vConsole);
</script>
<script>
const portfolio = document.querySelector("#portfolio-panel");
const paintandquestPreviewButton = document.querySelector("#paintandquest-preview-button");
const paintandquestPreviewButton2 = document.querySelector("#paintandquest-preview-button2");
portfolio.setAttribute("visible", true);
let y = 0;
let status = false;
paintandquestPreviewButton.addEventListener('click', () => {
if (status == false) {
// paintandquestPreviewButton.setAttribute("visible", false);
const testVideo = document.createElement("video");
const canplayWebm = testVideo.canPlayType('video/webm; codecs="vp8, vorbis"');
if (canplayWebm == "") {
document.querySelector("#paintandquest-video-link").setAttribute("src", "#paintandquest-video-mp4");
document.querySelector("#paintandquest-video-mp4").play();
} else {
paintandquestPreviewButton2.setAttribute("visible", false);
document.querySelector("#paintandquest-video-link").setAttribute("src", "#paintandquest-video-mp4");
document.querySelector("#paintandquest-video-mp4").play();
// alert('播放')
status = true
}
} else {
paintandquestPreviewButton2.setAttribute("visible", true);
// alert('暂停')
// portfolio.setAttribute("visible", true);
document.querySelector("#paintandquest-video-mp4").pause();
status = false;
}
});
portfolio.setAttribute("position", "0 " + y + " -0.01");
document.addEventListener("DOMContentLoaded", function () {
const sceneEl = document.querySelector('a-scene');
let arSystem;
sceneEl.addEventListener('loaded', function () {
// alert('执行')
arSystem = sceneEl.systems["mindar-image-system"];
});
const startButton = document.querySelector("#example-start-button");
startButton.addEventListener('click', () => {
console.log("start");
arSystem.start(); // start AR
arSystem.pause(true);
});
sceneEl.addEventListener("arReady", (event) => {
alert('AR引擎已启动')
});
sceneEl.addEventListener("arError", (event) => {
alert('相机未启动成功！')
});
});
</script>
</body>
</html>实际效果：
手机端ar图像测试