webxr-ios-js/examples/persistence/index.html at master · MozillaReality/webxr-ios-js · GitHub

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<html>
  <!-- Any copyright is dedicated to the Public Domain.
			  http://creativecommons.org/publicdomain/zero/1.0/
	-->
	<head>
		<title>Hit test example</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<script src="../libs/three/three.min.js"></script>
 		<script module src="../../dist/webxr.js"></script>
		<link rel="stylesheet" href="../common.css"/>
	</head>
	<body>
		<div id="description">
			<h2>Hit Test with Persistence</h2>
			<h5>(click to dismiss)</h5>
			<p>Find anchors by searching on tap events.</p>
		</div>
		<button type=button id=go-button>Go</button><br>
		<button type=button id=get-button style="display: none">Get Map</button><br>
		<button type=button id=set-button style="display: none">Set Map</button><br>
		<script type=module>
			// some dependencies and utilities
			import * as mat4 from '../libs/gl-matrix/mat4.js'
			import * as vec3 from '../libs/gl-matrix/vec3.js'

			import XREngine from "../XREngine.js"
			import XRInputManager from "../XRInputManager.js"

			let device = null
			let session = null
			let eyeLevelFrameOfReference = null
			let engine = null

			// temporary working variables
			const workingMatrix = mat4.create()
			const workingVec3 = vec3.create()

			// for debugging, not for production use
			let mapMessageEl = document.createElement('div')
			mapMessageEl.style.position = 'absolute'
			mapMessageEl.style.bottom = '30px'
			mapMessageEl.style.left = '10px'
			mapMessageEl.style.color = 'grey'
			mapMessageEl.style['font-size'] = '16px'
			document.body.appendChild(mapMessageEl)

			// a saved map
			var worldMap = null

			function initializeScene(){
				engine.addAmbientLight()
				engine.addDirectionalLight()

				// Add a box and axis at the origin of the eye-level coordinate system
				// for debugging by uncommenting these lines
				// engine.addBox([0, 0, 0], [0.025, 0.025, 0.025], 0x44ff44)
				// engine.addAxesHelper([0,0,0], [0.2,0.2,0.2])
			}

			function handleHitResults(hits) {
				let size = 0.05;
				let hit = hits[0]
				if (hit) {
					// use the hitMatrix so it creates an independent anchor
					session.requestFrameOfReference('head-model').then(headFrameOfReference => {
						session.addAnchor(hit.hitMatrix, headFrameOfReference).then(anchor => {
							engine.addAnchoredNode(anchor, createSceneGraphNode())
						}).catch(err => {
							console.error('Error adding anchor', err)
						})
					})
				}
			}

			// Creates a box used to indicate the location of an anchor offset
			function createSceneGraphNode(){
				let group = new THREE.Group()
				let geometry = new THREE.BoxBufferGeometry(0.1, 0.1, 0.1)
				var color = new THREE.Color( 0xffffff );
        		color.setHex( Math.random() * 0xffffff );
				let material = new THREE.MeshPhongMaterial({ color: color })
				let mesh = new THREE.Mesh(geometry, material)

				var outlineMaterial = new THREE.MeshBasicMaterial( { color: 0x00ff00, side: THREE.BackSide } );
				var outlineMesh = new THREE.Mesh( geometry, outlineMaterial );

				mesh.position.set(0, 0.05, 0)
				outlineMesh.position.set(0, 0.05, 0);
				outlineMesh.scale.multiplyScalar(1.05);

				group.add(mesh)
				group.add(outlineMesh)
				return group
			}

			// Called once per frame, before render, to give the app a chance to update this.scene
			function updateScene(frame){
				let msg = session.nonStandard_getWorldMappingStatus()
				if (msg) {
					mapMessageEl.innerHTML = msg
				}
			}


			/**
			 * Basic flow needed:
			 * - session.getMapForAnchor(anchor)
			 *   returns a promise that resolves when finished.
			 *   internally, we'll wait till the area is "mapped", then get the map and
			 *   check if the anchor is in it.  Will only return the map without details
			 *   has methods to cancel trying, and check status
			 * - session.getAnchorFromMap(map)
			 *   returns a promise that resolves when the map has loaded and the
			 *   anchor associated with the map is alive.
			 *      or returns a new kind of XRAnchor, XRMappedAnchor, that can be
			 *      tested as to when it is resolved and thus valid, and also has
			 *      methods to cancel the resolving process and get status
			 *   need to be careful to not pass other anchors up to the app
			*/
			function getMap() {
				session.nonStandard_getWorldMap().then(map => {
					worldMap = map;
					console.log("got worldMap, size = ", worldMap.worldMap.length)
				}).catch(err => {
					console.error('Could not get world Map', err)
					worldMap = null;
				});
			}

			// if you have a world map, you can use it with a similar command.
			// to see it in action, uncomment the following code:
			//
			function setMap () {
				if (worldMap) {
					session.nonStandard_setWorldMap(worldMap).then(val => {

						// val returns a list of anchors, many of which are not yet valid
						// we will set them to one thing now, and change it to something
						// else when the first update happens


						console.log("set worldMap ok")
					}).catch(err => {
						console.error('Could not set world Map', err)
					})
				}
			}

			function _handleNewWorldAnchor(event) {
				let anchor = event.detail

				if (anchor.uid.startsWith('anchor-')) {
					// it's an anchor we created last time
					console.log("RECEIVED anchor with uid=", anchor.uid)

					this.addAnchoredNode(new XRAnchorOffset(anchor.uid), this._createSceneGraphNode())
				}
			}


			////////////////////////////////////////////////////
			////////////////////////////////////////////////////
			// BOILER PLATE.  Can you feel the plates boiling?
			//
			// Create the output context where the XRSession will place composited renders
			const xrCanvas = document.createElement('canvas')
			xrCanvas.setAttribute('class', 'xr-canvas')
			const xrContext = xrCanvas.getContext('xrpresent')
			if(!xrContext){
				console.error('No XR context', xrCanvas)
			}

			// get the XR Device
			navigator.xr.requestDevice().then(xrDevice => {
				device = xrDevice
			}).catch(err => {
				console.error('Error', err)
			})

			document.getElementById('description').addEventListener('touchstart', hideMe, {capture: true})
			function hideMe(event) {
				event.target.style.display = 'none'
				event.stopPropagation()
			}

			document.getElementById('go-button').addEventListener('click', handleStartSessionRequest, true)
			document.getElementById('go-button').addEventListener('touchstart', eatButtonTouch, true)
			function eatButtonTouch(event) {
				event.stopPropagation()
			}

			document.getElementById('get-button').addEventListener('click', getMap, true)
			document.getElementById('get-button').addEventListener('touchstart', eatButtonTouch, true)
			document.getElementById('set-button').addEventListener('click', setMap, true)
			document.getElementById('set-button').addEventListener('touchstart', eatButtonTouch, true)

			// handle input events from the XRInputManager
			const inputManager = new XRInputManager(handleXRInput)
			function handleXRInput(eventName, details){
				switch(eventName){
					case 'normalized-touch':
						hitTestWithScreenCoordinates(...details.normalizedCoordinates)
							.then(handleHitResults)
							.catch(err => {
								console.error('Error testing hits', err)
							})
						break
					default:
						console.error('unknown xr input event', eventName, details)
						break
				}
			}

			function hitTestWithScreenCoordinates(normalizedX, normalizedY){
				if(session === null){
					console.log('No session for hit testing')
					return Promise.reject()
				}
				// Convert the screen coordinates into head-model origin/direction for hit testing
				const [origin, direction] =
						XRInputManager.convertScreenCoordinatesToRay(normalizedX, normalizedY,
											 																	 engine.camera.projectionMatrix)

				return session.requestFrameOfReference('head-model').then(headFrameOfReference => {
					return session.requestHitTest(origin, direction, headFrameOfReference)
				})
			}

			/////////////////////
			// Session startup / shutdown
			function handleStartSessionRequest(ev){
				if(device === null){
					console.error('No xr device')
					return
				}

				if (!session) {
					device.requestSession({
                        outputContext: xrContext,
                        worldSensing: true
                    }).then(handleSessionStarted)
						.catch(err => {
							console.error('Session setup error', err)
						})
					document.getElementById('go-button').innerText = "End"
					document.getElementById('go-button').style.display = "none"
					document.getElementById('set-button').style.display = 'block'
					document.getElementById('get-button').style.display = 'block'
				} else {
					session.end()
					handleSessionEnded();
					document.getElementById('description').style.display = 'block'
					document.getElementById('set-button').style.display = 'none'
					document.getElementById('get-button').style.display = 'none'
					document.getElementById('go-button').style.display = "block"
					document.getElementById('go-button').innerText = "Go"
				}
			}

			function handleSessionEnded() {
				session = null
			}

			function handleSessionStarted(xrSession){
				session = xrSession
				document.body.insertBefore(xrCanvas, document.body.firstChild)

				// Create the context where we will render our 3D scene
				const canvas = document.createElement('canvas')
				var glContext = canvas.getContext('webgl', {
					compatibleXRDevice: device
				})
				if(!glContext) throw new Error('Could not create a webgl context')

				// Set up the base layer
				session.baseLayer = new XRWebGLLayer(session, glContext)

				// Create a simple test scene and renderer
				// The engine's scene is in the eye-level coordinate system
				engine = new XREngine(canvas, glContext)

				createRootNode().then(() => {
					// Kick off rendering
					session.requestAnimationFrame(handleAnimationFrame)
				})

				initializeScene()
			}

			async function createRootNode() {
				let headFrameOfReference = await session.requestFrameOfReference('head-model')
				eyeLevelFrameOfReference = await session.requestFrameOfReference('eye-level')

				// get the location of the device, and use it to create an
				// anchor with the identity orientation
				headFrameOfReference.getTransformTo(eyeLevelFrameOfReference, workingMatrix)
				mat4.getTranslation(workingVec3, workingMatrix)
				mat4.fromTranslation(workingMatrix, workingVec3)

				let anchor = await session.addAnchor(workingMatrix, eyeLevelFrameOfReference)
				engine.addAnchoredNode(anchor, engine.root)

				return true
			}

			////////////////
			// render loop
			function handleAnimationFrame(t, frame){
				if(!session || session.ended) return
				updateScene()
				session.requestAnimationFrame(handleAnimationFrame)

				let pose = frame.getDevicePose(eyeLevelFrameOfReference)
				if(!pose){
					console.log('No pose')
					return
				}

				engine.startFrame()
				for (let view of frame.views) {
					engine.preRender(
						session.baseLayer.getViewport(view),
						view.projectionMatrix,
						pose.getViewMatrix(view)
					)
					engine.render()
				}
				engine.endFrame()
			}


		</script>
	</body>
</html>