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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>AR img • A-Frame</title>
<meta name="description" content="Hello, DOM Overlay! • A-Frame"/>
<script src="https://cdn.jsdelivr.net/gh/aframevr/aframe@b61cf9a7e46a86119823625634a7b4f5098cb443/dist/aframe-master.min.js"></script>
<link rel="stylesheet" href="style.css">
<script>
AFRAME.registerComponent("exit-ar-button", {
schema: {
element: {type: "selector"}
},
init: function () {
this.data.element.addEventListener("click", ev => {
this.el.sceneEl.renderer.xr.getSession().end();
});
}
});
AFRAME.registerComponent("occluder", {
init: function () {
const mesh = this.el.getObject3D('mesh')
mesh.material.colorWrite = false
}
});
AFRAME.registerComponent("xr-tracked-image", {
schema: {
element: {type: "selector"},
widthInMeters: {type: "number"}
},
init: function () {
console.log("xr-tracked-image init");
this.el.emit("register-xr-tracked-image", {node: this});
}
});
AFRAME.registerSystem("xr-tracked-images", {
init: function () {
console.log("xr-tracked-images init");
this.trackedNodesByImageIdNum = {};
this.trackedImageList = [];
this.trackedImagesPreviousFrame = {};
this.el.sceneEl.systems.webxr.sessionConfiguration.trackedImages = this.trackedImageList;
this.el.sceneEl.addEventListener("register-xr-tracked-image", async ev => {
let node = ev.detail.node;
console.log("register", node);
let trackedData = node.data;
let bitmap = await createImageBitmap(trackedData.element);
let idNum = this.trackedImageList.length;
this.trackedImageList.push({
image: bitmap,
widthInMeters: trackedData.widthInMeters
});
this.trackedNodesByImageIdNum[idNum] = node;
});
this.el.sceneEl.addEventListener("enter-vr", ev => {
if (this.el.sceneEl.is("ar-mode")) {
console.log("ar-mode start");
let session = this.el.sceneEl.renderer.xr.getSession();
let refSpaceType =
this.el.sceneEl.systems.webxr.sessionReferenceSpaceType ||
"local-floor";
session.requestReferenceSpace(refSpaceType).then(space => {
this.refSpace = space;
});
}
});
},
tick: function () {
let session = this.el.sceneEl.renderer.xr.getSession();
if (!session) return;
let frame = this.el.sceneEl.frame;
let imagesTrackedThisFrame = {};
let results = frame.getImageTrackingResults();
for (let i = 0; i < results.length; ++i) {
let result = results[i];
let pose = frame.getPose(result.imageSpace, this.refSpace);
let idNum = result.index;
imagesTrackedThisFrame[idNum] = true;
console.log("pose", pose, "for image", idNum, " state=" + result.trackingState, " width=", result.measuredWidthInMeters);
let node = this.trackedNodesByImageIdNum[idNum];
console.log(node);
if (!node) continue;
// node.el.children[1].setAttribute(
// "opacity",
// result.trackingState == "tracked" ? 0.7 : 0.1);
if (pose) {
let object3D = node.el.object3D;
object3D.visible = true;
object3D.matrix.elements = pose.transform.matrix;
object3D.matrix.decompose(
object3D.position,
object3D.rotation,
object3D.scale
);
}
}
for (const index in this.imagesTrackedPreviousFrame) {
if (!imagesTrackedThisFrame[index]) {
this.trackedNodesByImageIdNum[index].el.object3D.visible = false;
}
}
this.imagesTrackedPreviousFrame = imagesTrackedThisFrame;
}
});
</script>
</head>
<body>
<div id="overlay">
<span id="greeting">
Hi, I'm the DOM Overlay
</span>
<button id="exit-ar">Exit AR</button>
</div>
<div id="text">
<h1>
WebXR image tracking
</h1>
<p>
<b>WARNING: Experimental.</b> This is a preliminary API and is likely to change.
</p>
<p>
Currently requires Chrome Canary 88.0.4313.2 or newer, and needs "WebXR Incubations" enabled in chrome://flags.
</p>
<p>
To test tracking, print this images, or display it on a separate device:
<a href="https://cdn.glitch.com/170bb543-c9df-448f-aced-de914aeedbba%2Farcore-sample-000-earth.jpg?v=1592958053263">Earth</a>,
</p>
</div>
<a-scene
background="color: #ECECEC"
webxr="requiredFeatures: image-tracking,local-floor; optionalFeatures: dom-overlay; overlayElement: #overlay"
>
<a-assets>
<img
id="earth"
src="https://cdn.glitch.com/170bb543-c9df-448f-aced-de914aeedbba%2Farcore-sample-000-earth.jpg?v=1592958053263"
/>
<img
id="360"
src="360.jpg"
/>
</a-assets>
<a-entity xr-tracked-images></a-entity>
<a-entity exit-ar-button="element: #exit-ar"></a-entity>
<a-entity xr-tracked-image="element: #earth; widthInMeters: 0.095">
<a-ring
rotation="-90 0 0"
radius-inner="0.045"
radius-outer="1"
segments-theta="64"
occluder
></a-ring>
<a-entity geometry="primitive: sphere; radius:1.0; phiStart: 0; phiLength: 180; segmentsWidth: 64; segmentsHeight: 20; thetaStart: 0; thetaLength:180;"
scale="0.1 0.1 -0.1"
rotation="-90 0 0"
position="0 0 0"
material="src: #360; shader: flat; side:back;"
></a-entity>
</a-entity>
</a-scene>
</body>
</html>