webxr-geospatial/examples/geospatial/index.html at master · MozillaReality/webxr-geospatial · GitHub

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<html>
  <!-- Any copyright is dedicated to the Public Domain.
			  http://creativecommons.org/publicdomain/zero/1.0/
	-->
	<head>
		<title>Geospatial AR 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.js"></script>
 		<script module src="../libs/webxr.js"></script>
		 <script src="../libs/Cesium.js"></script>
 		<script src="../../dist/webxr-geospatial.js"></script>
		<link rel="stylesheet" href="../common.css"/>
		<script src="../libs/three-web-layer.umd.js"></script>
	</head>
	<body>
		<div id="description">
			<h2>Geospatial AR Example</h2>
			<h5>(click to dismiss)</h5>
			<p>This example displays some cubes to the North, South, East and West from the user's geospatial location. Tapping a cube tells the program to pretend the device is there.  Tapping anywhere else resets to using the real geolocation.</p>
		</div>
		<button type=button id=go-button>Go</button>
		<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()

			let textBox = document.createElement('span')
			textBox.setAttribute('id', 'text-box')
			textBox.setAttribute('class', 'text-box')
			//textBox.style.visibility = 'hidden'

			textBox.myText = '<p>Waiting to start ...</p>'
			textBox.innerHTML = textBox.myText

			document.body.appendChild(textBox)

			var raycaster = new THREE.Raycaster();
			var mouse = null
			var boxes = []

			////////////
			var myGeoNode = null;
			var myGeoAnchor = null

			var myGeoLoc = null

			// for moving DIVs to 3D
			function beforeRasterize(webLayer) {
				webLayer.element.style.visibility = "visible"
			}
			function afterRasterize(webLayer) {
				webLayer.element.style.visibility = "hidden"
			}
			let layerOptions = {
				onBeforeRasterize: beforeRasterize,
				onAfterRasterize: afterRasterize
			}

			var descLayer = new WebLayer3D(document.getElementById('description'), layerOptions)
			var textLayer = new WebLayer3D(textBox, layerOptions)

			var clock = new THREE.Clock()
			var hudNode = new THREE.Group()
			hudNode.add(descLayer)
			hudNode.add(textLayer)

			hudNode.visible = false
			const HUD_Z = 0.2  // 2cm in front of display

			updateLoop()

			function sleep (time) {
		        return new Promise((resolve) => setTimeout(resolve, time));
    		}

			XRGeospatialAnchor.useEstimatedElevation(true, 1.3)

			async function updateLoop () {
				let deviceCarto = await XRGeospatialAnchor.getDeviceCartographic()
				let txt = textBox.myText + "<p>device altitude " + deviceCarto.height.toPrecision(6) + "</p>"
				let defElev = await XRGeospatialAnchor.getDefaultElevation(deviceCarto)
				txt = txt + "<p>estimated altitude " + defElev.toPrecision(6) + "</p>"
				textBox.innerHTML = txt

				await XRGeospatialAnchor.useEstimatedElevation(true, 1.3)

				await sleep(1000)
				setTimeout(() => updateLoop(), 1)
			}

			function updateScene() {
				const deltaTime = clock.getDelta()
    			//const elapsedTime = clock.getElapsedTime()

				descLayer.shouldUseTargetLayout = 'always'
				textLayer.shouldUseTargetLayout = 'always'

			    descLayer.update(1) //deltaTime*10)
				textLayer.update(1) //deltaTime*10)

				if (mouse) {
					// update the picking ray with the camera and mouse position
					raycaster.setFromCamera( mouse, engine.camera );
					mouse = null

					if (descLayer.visible && descLayer.hitTest(raycaster.ray)) {
						descLayer.visible = false
					} else {
						// calculate objects intersecting the picking ray
						var intersects = raycaster.intersectObjects( boxes );
						let intersection = intersects.length ? intersects[0] : null
						if (intersection) {
							console.log("hit box: " + intersection.object.geoName)
							textBox.myText = 'At ' +  intersection.object.geoName + " box"
							moveGeoOrigin(intersection)
						} else {
							console.log("miss, going back to device geolocation")
							textBox.myText = 'At device location'
							clearGeoOrigin()
						}
					}
				}
			}

			function updateForView() {
				let natural = WebLayer3D.computeNaturalDistance(engine.camera, engine.renderer)
				let scale = (HUD_Z / natural)

				//hudNode.scale.set(scale*window.devicePixelRatio, scale*window.devicePixelRatio, 1)
				hudNode.scale.set(scale, scale, 1)
			}

			async function moveGeoOrigin(intersection) {
				if (intersection && intersection.object.parent && intersection.object.parent.anchor) {
					let cartesian = intersection.object.parent.anchor.cartesian

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

					headFrameOfReference.getTransformTo(eyeLevelFrameOfReference, workingMatrix)
					let anchor = await session.addAnchor(workingMatrix, eyeLevelFrameOfReference)

					if (myGeoAnchor) {
						await session.removeAnchor(myGeoAnchor)
					}
					if (myGeoNode) {
						myGeoNode.parent.visible = true
					}

					myGeoNode = intersection.object
					myGeoNode.parent.visible = false
					myGeoAnchor = anchor

					XRGeospatialAnchor.overrideGeoLocation(cartesian, anchor)
					return true
				}
			}

			async function clearGeoOrigin()  {
				if (myGeoAnchor) {
					await session.removeAnchor(myGeoAnchor)
				}
				if (myGeoNode) {
					myGeoNode.parent.visible = true
				}
				myGeoAnchor = null
				myGeoNode = null

				XRGeospatialAnchor.useDeviceGeolocation()
			}

			// samples received from the location API at this location, at one point
			let testCartographic = Cesium.Cartographic.fromDegrees(-84.34824477127631, 33.78545836417129, 275.12518310546875)
			let testAltitude = 275.12518310546875

			// some other pints you could play with.
			//
			// let streetCorner = Cesium.Cartographic.fromDegrees(-84.348134, 33.785437, 0)
			// let upHillEast = Cesium.Cartographic.fromDegrees(-84.347461, 33.785337, 0)
			// let yardNortWest = Cesium.Cartographic.fromDegrees(-84.34824477127631, 33.78545836417129, 0)
			// let intersectionSouth = Cesium.Cartographic.fromDegrees(-84.348160, 33.783789, 0)

			const DIST = 0.001 * THREE.Math.DEG2RAD
			function initializeScene() {
				engine.camera.add(hudNode)
				hudNode.position.set(0,0,-HUD_Z)

				// go to where you should go ...
			    descLayer.update(1)
			    textLayer.update(1)

				engine.addAmbientLight(0xffffff, 0.8)

				// Add a box at the origin of our starting coordinate system
				// engine.addBox([0, -0.25, 0], [0.025, 0.025, 0.025], 0x44ff44)
				// engine.addAxesHelper([0,-0.25,0], [0.2,0.2,0.2])

				// some tests
				XRGeospatialAnchor.getDeviceCartographic().then(cartographic => {
					myGeoLoc = cartographic
					console.log("device cartographic: ", myGeoLoc)

					let north = Cesium.Cartographic.clone(cartographic)
					north.latitude += DIST
					XRGeospatialAnchor.createGeoAnchor(north).then(anchor => {
						engine.addAnchoredNode(anchor, createSceneGraphNode("north"))
					})
					let south = Cesium.Cartographic.clone(cartographic)
					south.latitude -= DIST
					XRGeospatialAnchor.createGeoAnchor(south).then(anchor => {
						engine.addAnchoredNode(anchor, createSceneGraphNode("south"))
					})
					let east = Cesium.Cartographic.clone(cartographic)
					east.longitude += DIST
					XRGeospatialAnchor.createGeoAnchor(east).then(anchor => {
						engine.addAnchoredNode(anchor, createSceneGraphNode("east"))
					})
					let west = Cesium.Cartographic.clone(cartographic)
					west.longitude -= DIST
					XRGeospatialAnchor.createGeoAnchor(west).then(anchor => {
						engine.addAnchoredNode(anchor, createSceneGraphNode("west"))
					})

				})

				XRGeospatialAnchor.getDeviceElevation().then(altitude => {
					console.log("device elevation: ", altitude)
				})

				XRGeospatialAnchor.getDefaultElevation(testCartographic).then(altitude => {
					console.log("recorded work elevation in past: ", testAltitude)
					console.log("estimated world elevation: ", altitude)
				})
			}

			// Creates a box used to indicate the location of an anchor offset
			function createSceneGraphNode(direction){
				let group = new THREE.Group()

				let texture = new THREE.TextureLoader().load( '../textures/crate-' + direction + '.gif' );
				texture.mapping = THREE.UVMapping;
				texture.anisotropy = engine.renderer.capabilities.getMaxAnisotropy();
				let material = new THREE.MeshLambertMaterial( { map: texture } );

				let geometry = new THREE.BoxBufferGeometry(20, 20, 20)
				let mesh = new THREE.Mesh(geometry, material)

				mesh.geoName = direction + " box"
				boxes.push(mesh)

				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
			}

			////////////////////////////////////////////////////
			////////////////////////////////////////////////////
			// 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', handleGoButtonTouch, true)
			function handleGoButtonTouch(event) {
				event.stopPropagation()
			}

			// handle input events from the XRInputManager
			const inputManager = new XRInputManager(handleXRInput)
			function handleXRInput(eventName, details){
				switch(eventName){
					case 'normalized-touch':
						mouse =  new THREE.Vector2(...details.normalizedCoordinates)
						break
					default:
						console.error('unknown xr input event', eventName, details)
						break
				}
			}


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

				if (!session) {
					device.requestSession({
						outputContext: xrContext,
						alignEUS: true,
						geolocation: true
					}).then(handleSessionStarted).catch(err => {
						console.error('Session setup error', err)
					})

					//document.getElementById('description').style.visibility = 'hidden'
					hudNode.visible = true

					textBox.myText = 'At device location'
					document.getElementById('go-button').innerText = "End"
					document.getElementById('go-button').style.display = 'none'
				} else {
					session.end()
					handleSessionEnded();
					document.getElementById('description').style.visibility = 'visible'
					document.getElementById('description').style.display = 'block'
					document.getElementById('go-button').innerText = "Go"

					hudNode.visible = false
					descLayer.visible = true
				}
			}

			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, true)

				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
				session.requestAnimationFrame(handleAnimationFrame)
				updateScene()

				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)
					)
					updateForView()
					engine.render()
				}
				engine.endFrame()
			}

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