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@@ -1,67 +1,147 @@
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-window.addEventListener('load', async function() {
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- try {
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- const session = await startARSession();
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+/**
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+ * Augmented Reality template using encantar.js
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+ * @author Alexandre Martins <alemartf(at)gmail.com> (https://github.com/alemart/encantar-js)
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+ */
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- function animate(time, frame)
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- {
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- session.requestAnimationFrame(animate);
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- }
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+(function() {
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- session.requestAnimationFrame(animate);
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- }
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- catch(error) {
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- alert(error.message);
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+/**
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+ * Start the AR session
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+ * @returns {Promise<Session>}
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+ */
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+async function startARSession()
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+{
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+ if(!AR.isSupported()) {
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+ throw new Error(
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+ 'This device is not compatible with this AR experience.\n\n' +
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+ 'User agent: ' + navigator.userAgent
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+ );
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}
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- async function startARSession()
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+ const tracker = AR.Tracker.ImageTracker();
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+ await tracker.database.add([
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{
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- if(!AR.isSupported()) {
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- throw new Error(
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- 'This device is not compatible with this AR experience.\n\n' +
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- 'User agent: ' + navigator.userAgent
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- );
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- }
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+ name: 'mage',
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+ image: document.getElementById('mage')
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+ },
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+ {
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+ name: 'cat',
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+ image: document.getElementById('cat')
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+ }
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+ ]);
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+
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+ const viewport = AR.Viewport({
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+ container: document.getElementById('ar-viewport'),
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+ hudContainer: document.getElementById('ar-hud')
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+ });
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+
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+ const video = document.getElementById('my-video');
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+ const useWebcam = (video === null);
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+ const source = useWebcam ? AR.Source.Camera() : AR.Source.Video(video);
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+
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+ const session = await AR.startSession({
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+ mode: 'immersive',
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+ viewport: viewport,
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+ trackers: [ tracker ],
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+ sources: [ source ],
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+ stats: true,
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+ gizmos: true,
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+ });
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+
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+ const scan = document.getElementById('scan');
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+
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+ tracker.addEventListener('targetfound', event => {
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+ if(scan)
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+ scan.hidden = true;
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+
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+ console.log('Target found: ' + event.referenceImage.name);
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+ });
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+
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+ tracker.addEventListener('targetlost', event => {
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+ if(scan)
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+ scan.hidden = false;
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+
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+ console.log('Target lost: ' + event.referenceImage.name);
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+ });
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+
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+ return session;
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+}
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+
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+/**
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+ * Animation loop
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+ * @param {number} time
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+ * @param {Frame} frame
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+ * @returns {void}
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+ */
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+function animate(time, frame)
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+{
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+ const session = frame.session;
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+ const deltaTime = session.time.delta; // given in seconds
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- //AR.Settings.powerPreference = 'low-power';
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-
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- const tracker = AR.Tracker.ImageTracker();
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- await tracker.database.add([{
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- name: 'my-reference-image',
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- image: document.getElementById('my-reference-image')
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- }]);
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-
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- const viewport = AR.Viewport({
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- container: document.getElementById('ar-viewport'),
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- hudContainer: document.getElementById('ar-hud')
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- });
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-
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- const video = document.getElementById('my-video');
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- const useWebcam = (video === null);
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- const source = useWebcam ?
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- AR.Source.Camera({ resolution: 'md' }) :
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- AR.Source.Video(video);
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-
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- const session = await AR.startSession({
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- mode: 'immersive',
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- viewport: viewport,
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- trackers: [ tracker ],
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- sources: [ source ],
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- stats: true,
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- gizmos: true,
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- });
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-
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- const scan = document.getElementById('scan');
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-
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- tracker.addEventListener('targetfound', event => {
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- if(scan)
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- scan.hidden = true;
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- });
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-
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- tracker.addEventListener('targetlost', event => {
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- if(scan)
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- scan.hidden = false;
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- });
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-
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- return session;
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+ mix(frame);
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+
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+ session.requestAnimationFrame(animate);
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+}
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+
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+/**
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+ * Blend the physical and the virtual scenes
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+ * @param {Frame} frame
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+ * @returns {boolean} true if an image is being tracked
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+ */
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+function mix(frame)
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+{
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+ for(const result of frame.results) {
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+ if(result.tracker.type == 'image-tracker') {
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+ if(result.trackables.length > 0) {
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+ const trackable = result.trackables[0];
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+ const projectionMatrix = result.viewer.view.projectionMatrix;
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+ const viewMatrix = result.viewer.pose.viewMatrix;
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+ const modelMatrix = trackable.pose.transform.matrix;
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+
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+ doSomethingWith(projectionMatrix, viewMatrix, modelMatrix);
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+ return true;
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+ }
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+ }
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}
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-});
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+
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+ return false;
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+}
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+
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+/**
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+ * Template function
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+ * @param {SpeedyMatrix} projectionMatrix
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+ * @param {SpeedyMatrix} viewMatrix
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+ * @param {SpeedyMatrix} modelMatrix
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+ * @returns {void}
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+ */
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+function doSomethingWith(projectionMatrix, viewMatrix, modelMatrix)
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+{
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+ /*
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+ console.log('projectionMatrix', projectionMatrix.toString());
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+ console.log('viewMatrix', viewMatrix.toString());
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+ console.log('modelMatrix', modelMatrix.toString());
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+ */
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+}
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+
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+/**
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+ * Start the Demo
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+ * @returns {void}
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+ */
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+function main()
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+{
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+ startARSession().then(session => {
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+
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+ const canvas = session.viewport.canvas; // render your virtual scene on this <canvas>
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+
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+ session.requestAnimationFrame(animate); // start the animation loop
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+
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+ }).catch(error => {
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+
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+ alert(error.message);
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+
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+ });
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+}
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+
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+document.addEventListener('DOMContentLoaded', main);
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+
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+})();
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alemart
11 月之前