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+/**
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+ * Augmented Reality demo using the babylon.js plugin for 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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+
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+(function() {
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+
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+/**
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+ * Augmented Reality Demo
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+ */
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+class EnchantedDemo extends ARDemo
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+{
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+ /**
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+ * Constructor
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+ */
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+ constructor()
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+ {
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+ super();
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+
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+ this._objects = { };
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+ }
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+
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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 startSession()
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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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+
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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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+ 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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+ session.gizmos.visible = false;
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+ if(scan)
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+ scan.hidden = true;
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+
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+ this._onTargetFound(event.referenceImage);
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+ });
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+
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+ tracker.addEventListener('targetlost', event => {
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+ session.gizmos.visible = true;
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+ if(scan)
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+ scan.hidden = false;
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+
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+ this._onTargetLost(event.referenceImage);
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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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+ * Initialization
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+ * @param {ARSystem} ar
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+ * @returns {Promise<void>}
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+ */
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+ async init(ar)
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+ {
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+ // Do not automatically play an animation when loading GLTF models
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+ BABYLON.SceneLoader.OnPluginActivatedObservable.add(loader => {
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+ if(loader.name == 'gltf') {
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+ loader.animationStartMode = BABYLON.GLTFLoaderAnimationStartMode.NONE;
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+ }
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+ });
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+
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+ // Change the point of view - slightly
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+ ar.root.position.y = -0.5;
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+
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+ // Initialize objects
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+ this._initLight(ar);
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+ this._initText(ar);
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+ this._initMagicCircle(ar);
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+
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+ await Promise.all([
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+ this._initMage(ar),
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+ this._initCat(ar),
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+ ]);
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+ }
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+
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+ /**
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+ * Animation loop
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+ * @param {ARSystem} ar
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+ * @returns {void}
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+ */
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+ update(ar)
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+ {
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+ const delta = ar.session.time.delta; // given in seconds
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+
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+ this._animateMagicCircle(delta);
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+ }
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+
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+
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+ // ------------------------------------------------------------------------
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+
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+
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+ _initLight(ar)
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+ {
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+ const light = new BABYLON.HemisphericLight('light', BABYLON.Vector3.Down());
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+ light.intensity = 1.0;
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+ light.diffuse.set(1, 1, 0.9);
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+ light.specular.set(0, 0, 0);
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+ }
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+
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+ _initMagicCircle(ar)
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+ {
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+ // create a magic circle
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+ const magicCircle = BABYLON.MeshBuilder.CreatePlane('magic-circle', {
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+ width: 1,
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+ height: 1,
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+ sideOrientation: BABYLON.Mesh.DOUBLESIDE
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+ });
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+
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+ magicCircle.material = new BABYLON.StandardMaterial('magic-circle-material');
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+ magicCircle.material.diffuseTexture = new BABYLON.Texture('../assets/magic-circle.png');
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+ magicCircle.material.diffuseTexture.hasAlpha = true;
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+ magicCircle.material.useAlphaFromDiffuseTexture = true;
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+ magicCircle.material.diffuseColor.set(0, 0, 0);
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+ magicCircle.material.emissiveColor.set(1, 1, 1);
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+ magicCircle.material.unlit = true;
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+ magicCircle.rotation.set(-Math.PI / 2, 0, 0);
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+ magicCircle.scaling.set(4, 4, 1);
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+
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+ // make it a child of ar.root
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+ magicCircle.parent = ar.root;
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+
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+ // save a reference
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+ this._objects.magicCircle = magicCircle;
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+ }
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+
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+ _initText(ar)
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+ {
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+ const text = BABYLON.MeshBuilder.CreatePlane('text', {
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+ width: 1,
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+ height: 1,
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+ sideOrientation: BABYLON.Mesh.DOUBLESIDE
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+ });
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+
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+ text.material = new BABYLON.StandardMaterial('text-material');
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+ text.material.diffuseTexture = new BABYLON.Texture('../assets/it-works.png');
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+ text.material.diffuseTexture.hasAlpha = true;
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+ text.material.useAlphaFromDiffuseTexture = true;
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+ text.material.diffuseColor.set(0, 0, 0);
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+ text.material.emissiveColor.set(1, 1, 1);
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+ text.material.unlit = true;
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+ text.position.set(0, 2, 0.5);
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+ text.scaling.set(3, 1.5, 1);
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+
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+ text.parent = ar.root;
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+
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+ this._objects.text = text;
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+ }
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+
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+ async _initMage(ar)
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+ {
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+ // load the mage
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+ const gltf = await BABYLON.SceneLoader.ImportMeshAsync('', '../assets/', 'mage.glb');
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+ const mage = gltf.meshes[0];
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+ mage.scaling.set(0.7, 0.7, 0.7);
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+
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+ // play an animation
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+ const anim = gltf.animationGroups.find(anim => anim.name == 'Idle');
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+ if(anim)
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+ anim.play(true);
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+
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+ // make the mage a child of ar.root
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+ mage.parent = ar.root;
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+
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+ // save a reference
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+ this._objects.mage = mage;
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+ }
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+
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+ async _initCat(ar)
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+ {
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+ const gltf = await BABYLON.SceneLoader.ImportMeshAsync('', '../assets/', 'cat.glb');
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+ const cat = gltf.meshes[0];
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+ cat.scaling.set(0.7, 0.7, 0.7);
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+
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+ const anim = gltf.animationGroups.find(anim => anim.name == 'Cheer');
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+ if(anim)
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+ anim.play(true);
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+
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+ cat.parent = ar.root;
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+
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+ this._objects.cat = cat;
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+ }
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+
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+ _animateMagicCircle(delta)
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+ {
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+ const TWO_PI = 2.0 * Math.PI;
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+ const ROTATIONS_PER_SECOND = 1.0 / 8.0;
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+
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+ this._objects.magicCircle.rotate(BABYLON.Axis.Z, -TWO_PI * ROTATIONS_PER_SECOND * delta);
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+ }
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+
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+ _onTargetFound(referenceImage)
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+ {
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+ // change the scene based on the tracked image
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+ switch(referenceImage.name) {
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+ case 'mage':
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+ this._objects.mage.setEnabled(true);
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+ this._objects.cat.setEnabled(false);
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+ this._objects.text.setEnabled(false);
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+ this._objects.magicCircle.material.emissiveColor.fromHexString('#beefff');
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+ break;
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+
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+ case 'cat':
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+ this._objects.mage.setEnabled(false);
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+ this._objects.cat.setEnabled(true);
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+ this._objects.text.setEnabled(true);
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+ this._objects.magicCircle.material.emissiveColor.fromHexString('#ffffaa');
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+ break;
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+ }
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+ }
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+
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+ _onTargetLost(referenceImage)
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+ {
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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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+ const demo = new EnchantedDemo();
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+
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+ if(typeof encantar === 'undefined')
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+ throw new Error(`Can't find the babylon.js plugin for encantar.js`);
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+
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+ encantar(demo).catch(error => {
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+ alert(error.message);
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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
před 11 měsíci
