[英]A-Frame with device camera: how to see video behind the a-scene?
我正在尝试通过在活动视频的顶部显示带有A-Frame的对象来实现穷人的AR。
注意:我不使用ar.js,因为我不想使用标记。
总而言之,应用程序运行良好,但是视频是半透明的,而不是我想要的完全不透明的视频。
问题是我将视频显示在A帧场景的顶部 ,并使它成为半透明的,以便通过它可以看到3d场景。
我这样做是因为如果视频低于场景(即Z索引较低),即使我为a场景放置background =“ transparent”,也不会显示该视频。 如果将“嵌入”添加到a场景中,则3d元素不会出现。
这是我的代码:
<!doctype html>
<html lang="en">
<head>
<script src="https://aframe.io/releases/0.9.2/aframe.min.js"></script>
<style>
a-scene {
height: 50%; width: 50%;
z-index: 10;
opacity:1
}
#webcam {
z-index: 20;
opacity:0.4;
position: absolute;
background-size: 100% 100%;
top: 0; left: 0;
min-width: 100%; min-height: 100%;
width: auto; height: auto;
}
</style>
<script>
var cameraView;
var constraints = {
audio: false,
video: {
facingMode: "environment",
}
};
// Access the device camera and stream to cameraView
function cameraStart() {
cameraView = document.querySelector("#webcam");
navigator.mediaDevices
.getUserMedia(constraints)
.then(function(stream) {
cameraView.srcObject = stream;
})
.catch(function(error) {
console.error("Oops. Something is broken.", error);
});
}
// Start the video stream when the window loads
window.addEventListener("load", cameraStart, false);
// Component to change to a sequential color on cursor suspension.
AFRAME.registerComponent('cursor-listener', {
init: function () {
var lastIndex = -1;
var COLORS = ['red', 'green', 'blue'];
this.el.addEventListener('click', function (evt) {
lastIndex = (lastIndex + 1) % COLORS.length;
this.setAttribute('material', 'color', COLORS[lastIndex]);
console.log('I was clicked at: ', evt.detail.intersection.point);
});
}
});
</script>
</head>
<body>
<video id="webcam" autoplay playsinline></video>
<a-scene vr-mode-ui="enabled: false" background="transparent">
<a-sphere cursor-listener position="-7 0 7" radius="1.25" color="yellowgreen"></a-sphere>
<a-sphere cursor-listener position="-7 0 -7" radius="1.25" color="green"></a-sphere>
<a-sphere cursor-listener position="7 0 7" radius="1.25" color="aqua"></a-sphere>
<a-sphere cursor-listener position="7 0 -7" radius="1.25" color="orange"></a-sphere>
<a-entity camera look-controls>
<a-entity cursor="fuse: true; fuseTimeout: 500"
position="0 0 -0.6"
geometry="primitive: ring; radiusInner: 0.02; radiusOuter: 0.03"
material="color: blue; shader: flat">
</a-entity>
</a-entity>
</a-scene>
</body>
</html>
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