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<html>
<head>
<meta charset='utf-8'>
<meta name='viewport' content='width=device-width, initial-scale=1, user-scalable=no'>
<meta name='mobile-web-app-capable' content='yes'>
<meta name='apple-mobile-web-app-capable' content='yes'>
<!-- Origin Trial Token, feature = WebXR Device API, origin = https://immersive-web.github.io, expires = 2018-08-28 -->
<meta http-equiv="origin-trial" data-feature="WebXR Device API" data-expires="2018-08-28" content="AnNpu7ceXvLew05ccD8Zr1OZsdZiB2hLQKK82kTTMDwF7oRKtP3QEJ4RzkeHrmB8Sq0vSV6ZNmszpBCZ0I8p9gAAAABceyJvcmlnaW4iOiJodHRwczovL2ltbWVyc2l2ZS13ZWIuZ2l0aHViLmlvOjQ0MyIsImZlYXR1cmUiOiJXZWJYUkRldmljZSIsImV4cGlyeSI6MTUzNTQxNDQwMH0=">
<title>Input Tracking</title>
<link href='css/common.css' rel='stylesheet'></link>
<!--The polyfill is not needed for browser that have native API support,
but is linked by these samples for wider compatibility.-->
<!--script src='https://cdn.jsdelivr.net/npm/webxr-polyfill@latest/build/webxr-polyfill.js'></script-->
<script src='js/webxr-polyfill.js'></script>
<!--This script patches up around implementation differences in past browser versions
so that the samples can always be written against the most recent spec changes.
It won't be necessary after the API has been officially shipped for a bit.-->
<script src='js/webxr-version-shim.js'></script>
<script src='js/cottontail/build/cottontail.js'></script>
<script src='js/webxr-button.js'></script>
</head>
<body>
<header>
<details open>
<summary>Input Tracking</summary>
<p>
This sample demonstrates basic tracking and rendering of
XRInputSources. It does not respond to button presses or other
controller interactions.
<a class="back" href="./">Back</a>
</p>
</details>
</header>
<script>
(function () {
'use strict';
// If requested, initialize the WebXR polyfill
if (QueryArgs.getBool('allowPolyfill', false)) {
var polyfill = new WebXRPolyfill();
}
// Apply the version shim after the polyfill is instantiated, to ensure
// that the polyfill also gets patched if necessary.
var versionShim = new WebXRVersionShim();
// XR globals.
let xrButton = null;
let xrImmersiveFrameOfRef = null;
let xrNonImmersiveFrameOfRef = null;
// WebGL scene globals.
let gl = null;
let renderer = null;
let scene = new Scene();
scene.addNode(new Gltf2Node({url: 'media/gltf/cave/cave.gltf'}));
scene.addNode(new SkyboxNode({url: 'media/textures/eilenriede-park-2k.png'}));
scene.standingStats(true);
function initXR() {
xrButton = new XRDeviceButton({
onRequestSession: onRequestSession,
onEndSession: onEndSession
});
document.querySelector('header').appendChild(xrButton.domElement);
if (navigator.xr) {
navigator.xr.requestDevice().then((device) => {
device.supportsSession({immersive: true}).then(() => {
xrButton.setDevice(device);
});
// Note: If you don't want dragging on the canvas to do things like
// scroll or pull-to-refresh, you'll want to set touch-action: none;
// on the canvas' CSS style, which this page does in common.css
let outputCanvas = document.createElement('canvas');
let ctx = outputCanvas.getContext('xrpresent');
device.requestSession({ outputContext: ctx })
.then((session) => {
document.body.appendChild(outputCanvas);
onSessionStarted(session);
});
}).catch(() => {
initFallback();
});
} else {
initFallback();
}
}
function initFallback() {
initGL();
document.body.appendChild(gl.canvas);
let fallbackHelper = new FallbackHelper(scene, gl);
fallbackHelper.emulateStage = true;
}
function initGL(compatibleDevice) {
if (gl)
return;
gl = createWebGLContext({
compatibleXRDevice: compatibleDevice
});
renderer = new Renderer(gl);
scene.setRenderer(renderer);
// Loads a generic controller mesh.
scene.inputRenderer.setControllerMesh(new Gltf2Node({url: 'media/gltf/controller/controller.gltf'}));
}
function onRequestSession(device) {
// Set up a mirror canvas
let mirrorCanvas = document.createElement('canvas');
let ctx = mirrorCanvas.getContext('xrpresent');
mirrorCanvas.setAttribute('id', 'mirror-canvas');
document.body.appendChild(mirrorCanvas);
device.requestSession({ immersive: true, outputContext: ctx }).then((session) => {
xrButton.setSession(session);
onSessionStarted(session);
});
}
function onSessionStarted(session) {
session.addEventListener('end', onSessionEnded);
initGL(session.device);
session.baseLayer = new XRWebGLLayer(session, gl);
session.requestFrameOfReference('stage').then((frameOfRef) => {
if (session.immersive) {
xrImmersiveFrameOfRef = frameOfRef;
} else {
xrNonImmersiveFrameOfRef = frameOfRef;
}
session.requestAnimationFrame(onXRFrame);
});
}
function onEndSession(session) {
session.end();
}
function onSessionEnded(event) {
if (event.session.immersive) {
document.body.removeChild(document.querySelector('#mirror-canvas'));
xrButton.setSession(null);
}
}
function updateInputSources(session, frame, frameOfRef) {
let inputSources = session.getInputSources();
for (let inputSource of inputSources) {
let inputPose = frame.getInputPose(inputSource, frameOfRef);
// We may not get a pose back in cases where the input source has lost
// tracking or does not know where it is relative to the given frame
// of reference.
if (!inputPose) {
continue;
}
if (inputPose.gripMatrix) {
// If we have a grip matrix use it to render a mesh showing the
// position of the controller.
scene.inputRenderer.addController(inputPose.gripMatrix);
}
if (inputPose.targetRay) {
if (inputSource.targetRayMode == 'tracked-pointer') {
// If we have a pointer matrix and the pointer origin is the users
// hand (as opposed to their head or the screen) use it to render
// a ray coming out of the input device to indicate the pointer
// direction.
scene.inputRenderer.addLaserPointer(inputPose.targetRay);
}
// If we have a pointer matrix we can also use it to render a cursor
// for both handheld and gaze-based input sources.
// Statically render the cursor 2 meters down the ray since we're
// not calculating any intersections in this sample.
let cursorDistance = 2.0;
let cursorPos = vec3.fromValues(
inputPose.targetRay.origin.x,
inputPose.targetRay.origin.y,
inputPose.targetRay.origin.z
);
vec3.add(cursorPos, cursorPos, [
inputPose.targetRay.direction.x * cursorDistance,
inputPose.targetRay.direction.y * cursorDistance,
inputPose.targetRay.direction.z * cursorDistance,
]);
// vec3.transformMat4(cursorPos, cursorPos, inputPose.targetRay.transformMatrix);
scene.inputRenderer.addCursor(cursorPos);
}
}
}
function onXRFrame(t, frame) {
let session = frame.session;
let frameOfRef = session.immersive ?
xrImmersiveFrameOfRef :
xrNonImmersiveFrameOfRef;
let pose = frame.getDevicePose(frameOfRef);
scene.startFrame();
session.requestAnimationFrame(onXRFrame);
updateInputSources(session, frame, frameOfRef);
scene.drawXRFrame(frame, pose);
scene.endFrame();
}
// Start the XR application.
initXR();
})();
</script>
</body>
</html>