three.js/examples/measure-it.html

<!DOCTYPE html>
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<!-- three.js library -->
<script src='vendor/three.js/build/three.js'></script>
<!-- jsartookit -->
<script src="../vendor/jsartoolkit5/build/artoolkit.min.js"></script>
<script src="../vendor/jsartoolkit5/js/artoolkit.api.js"></script>
<!-- include threex.artoolkit -->
<script src="../src/threex/threex-artoolkitsource.js"></script>
<script src="../src/threex/threex-artoolkitcontext.js"></script>
<script src="../src/threex/threex-arbasecontrols.js"></script>
<script src="../src/threex/threex-armarkercontrols.js"></script>
<script>THREEx.ArToolkitContext.baseURL = '../'</script>

<body style='margin : 0px; overflow: hidden; font-family: Monospace;'><div style='position: absolute; top: 10px; width:100%; text-align: center; z-index: 1;'>
	<a href="https://github.com/jeromeetienne/AR.js/" target="_blank">AR.js</a> - Measure the distance between 2 markers - hiro and kanji
	<br/>
	Contact me any time at <a href='https://twitter.com/jerome_etienne' target='_blank'>@jerome_etienne</a>
</div>
<script>
	//////////////////////////////////////////////////////////////////////////////////
	//		Init
	//////////////////////////////////////////////////////////////////////////////////

	// init renderer
	var renderer	= new THREE.WebGLRenderer({
		antialias	: true,
		alpha: true
	});
	renderer.setClearColor(new THREE.Color('lightgrey'), 0)
	renderer.setSize( 640, 480 );
	renderer.domElement.style.position = 'absolute'
	renderer.domElement.style.top = '0px'
	renderer.domElement.style.left = '0px'
	document.body.appendChild( renderer.domElement );

	// array of functions for the rendering loop
	var onRenderFcts= [];

	// init scene and camera
	var scene	= new THREE.Scene();

	//////////////////////////////////////////////////////////////////////////////////
	//		Initialize a basic camera
	//////////////////////////////////////////////////////////////////////////////////

	// Create a camera
	var camera = new THREE.Camera();
	scene.add(camera);

	////////////////////////////////////////////////////////////////////////////////
	//          handle arToolkitSource
	////////////////////////////////////////////////////////////////////////////////

	var arToolkitSource = new THREEx.ArToolkitSource({
		// to read from the webcam
		sourceType : 'webcam',

		// to read from an image
		// sourceType : 'image',
		// sourceUrl : THREEx.ArToolkitContext.baseURL + '../data/images/img.jpg',

		// to read from a video
		// sourceType : 'video',
		// sourceUrl : THREEx.ArToolkitContext.baseURL + '../data/videos/headtracking.mp4',
	})

	arToolkitSource.init(function onReady(){
		onResize()
	})

	// handle resize
	window.addEventListener('resize', function(){
		onResize()
	})
	function onResize(){
		arToolkitSource.onResizeElement()
		arToolkitSource.copyElementSizeTo(renderer.domElement)
		if( arToolkitContext.arController !== null ){
			arToolkitSource.copyElementSizeTo(arToolkitContext.arController.canvas)
		}
	}
	////////////////////////////////////////////////////////////////////////////////
	//          initialize arToolkitContext
	////////////////////////////////////////////////////////////////////////////////

	// create atToolkitContext
	var arToolkitContext = new THREEx.ArToolkitContext({
		cameraParametersUrl: THREEx.ArToolkitContext.baseURL + '../data/data/camera_para.dat',
		detectionMode: 'mono',
	})
	// initialize it
	arToolkitContext.init(function onCompleted(){
		// copy projection matrix to camera
		camera.projectionMatrix.copy( arToolkitContext.getProjectionMatrix() );
	})

	// update artoolkit on every frame
	onRenderFcts.push(function(){
		if( arToolkitSource.ready === false )	return

		arToolkitContext.update( arToolkitSource.domElement )
	})

;(function(){

	//////////////////////////////////////////////////////////////////////////////
	//		markerRoot1
	//////////////////////////////////////////////////////////////////////////////

	// build markerControls
	var markerRoot1 = new THREE.Group
	markerRoot1.name = 'marker1'
	scene.add(markerRoot1)
	var markerControls = new THREEx.ArMarkerControls(arToolkitContext, markerRoot1, {
		type : 'pattern',
		patternUrl : THREEx.ArToolkitContext.baseURL + '../data/data/patt.hiro',
		// patternUrl : THREEx.ArToolkitContext.baseURL + '../data/data/patt.kanji',
	})

	// add a gizmo in the center of the marker
	var geometry	= new THREE.OctahedronGeometry( 0.1, 0 )
	var material	= new THREE.MeshNormalMaterial({
		wireframe: true
	});
	var mesh	= new THREE.Mesh( geometry, material );
	markerRoot1.add( mesh );

	//////////////////////////////////////////////////////////////////////////////
	//		markerRoot2
	//////////////////////////////////////////////////////////////////////////////

	// build markerControls
	var markerRoot2 = new THREE.Group
	markerRoot2.name = 'marker2'
	scene.add(markerRoot2)
	var markerControls = new THREEx.ArMarkerControls(arToolkitContext, markerRoot2, {
		type : 'pattern',
		// patternUrl : THREEx.ArToolkitContext.baseURL + '../data/data/patt.hiro',
		patternUrl : THREEx.ArToolkitContext.baseURL + '../data/data/patt.kanji',
	})

	// add a gizmo in the center of the marker
	var geometry	= new THREE.OctahedronGeometry( 0.1, 0 )
	var material	= new THREE.MeshNormalMaterial({
		wireframe: true
	});
	var mesh	= new THREE.Mesh( geometry, material );
	markerRoot2.add( mesh );
})()


;(function(){
	var markerRoot1 = scene.getObjectByName('marker1')
	var markerRoot2 = scene.getObjectByName('marker2')

	var container = new THREE.Group
	scene.add(container)

	// update container.visible and scanningSpinner visibility
	onRenderFcts.push(function(){
		if( markerRoot1.visible === true && markerRoot2.visible === true ){
			container.visible = true
			document.querySelector('.scanningSpinner').style.display = 'none'
		}else{
			container.visible = false
			document.querySelector('.scanningSpinner').style.display = ''
		}
	})

	//////////////////////////////////////////////////////////////////////////////
	//		build lineMesh
	//////////////////////////////////////////////////////////////////////////////
	var material = new THREE.LineDashedMaterial( {
		dashSize: 1,
		gapSize: 1,
	} );
	var geometry = new THREE.Geometry();
	geometry.vertices.push(new THREE.Vector3(1, 0, -3));
	geometry.vertices.push(new THREE.Vector3(-1, 0, -3));
	var lineMesh = new THREE.Line(geometry, material);
	container.add(lineMesh)

	// update lineMesh
	onRenderFcts.push(function(){
		var geometry = lineMesh.geometry
		geometry.vertices[0].copy(markerRoot1.position)
		geometry.vertices[1].copy(markerRoot2.position)
		geometry.verticesNeedUpdate = true

		geometry.computeBoundingSphere();
		lineMesh.computeLineDistances();

		var length = markerRoot1.position.distanceTo(markerRoot2.position)
		lineMesh.material.scale = length * 10
		lineMesh.material.needsUpdate = true
	})


	//////////////////////////////////////////////////////////////////////////////
	//		display the distance between the 2 markers
	//////////////////////////////////////////////////////////////////////////////

	// build texture
	var canvas = document.createElement( 'canvas' );
	canvas.width = 128;
	canvas.height = 64;
	var context = canvas.getContext( '2d' );
	var texture = new THREE.CanvasTexture( canvas );

	// build sprite
	var material = new THREE.SpriteMaterial({
		map: texture,
		color: 0xffffff,
	});
	var sprite = new THREE.Sprite( material );
	sprite.scale.multiplyScalar(0.5)
	container.add(sprite)

	// upload measure
	onRenderFcts.push(function(){
		// update sprite position
		sprite.position.addVectors(markerRoot1.position, markerRoot2.position).multiplyScalar(1/2)

		// get the text to display
		var length = markerRoot1.position.distanceTo(markerRoot2.position)
		var text = length.toFixed(2)

		// put the text in the sprite
		context.font = '40px monospace';
		context.clearRect( 0, 0, canvas.width, canvas.height );
		context.fillStyle = '#fff';
		context.fillText(text, canvas.width/4, 3*canvas.height/4 )
		sprite.material.map.needsUpdate = true
	})

})()
	//////////////////////////////////////////////////////////////////////////////////
	//		render the whole thing on the page
	//////////////////////////////////////////////////////////////////////////////////

	// render the scene
	onRenderFcts.push(function(){
		renderer.render( scene, camera );
	})

	// run the rendering loop
	var lastTimeMsec= null
	requestAnimationFrame(function animate(nowMsec){
		// keep looping
		requestAnimationFrame( animate );
		// measure time
		lastTimeMsec	= lastTimeMsec || nowMsec-1000/60
		var deltaMsec	= Math.min(200, nowMsec - lastTimeMsec)
		lastTimeMsec	= nowMsec
		// call each update function
		onRenderFcts.forEach(function(onRenderFct){
			onRenderFct(deltaMsec/1000, nowMsec/1000)
		})
	})
</script>

<!-- Scanning animation when the marker are not visible -->
<div class="scanningSpinner">
	<label>
		Scanning
	</label>
	<div class="rect1"></div>
	<div class="rect2"></div>
	<div class="rect3"></div>
</div>
<style>
.scanningSpinner {
	margin: 100px auto;
	height: 40px;
	text-align: center;
}

.scanningSpinner label {
	display: block;
	color: #333;
	font-size: 200%;
}

.scanningSpinner > div {
	background-color: #333;
	height: 100%;
	width: 6px;
	display: inline-block;

	-webkit-animation: sk-stretchdelay 1.2s infinite ease-in-out;
	animation: sk-stretchdelay 1.2s infinite ease-in-out;
}

.scanningSpinner .rect2 {
	-webkit-animation-delay: -1.1s;
	animation-delay: -1.1s;
}

.scanningSpinner .rect3 {
	-webkit-animation-delay: -1.0s;
	animation-delay: -1.0s;
}

@-webkit-keyframes sk-stretchdelay {
	0%, 40%, 100% { -webkit-transform: scaleY(0.4) }
	20% { -webkit-transform: scaleY(1.0) }
}

@keyframes sk-stretchdelay {
	0%, 40%, 100% {
		transform: scaleY(0.4);
		-webkit-transform: scaleY(0.4);
		}
	20% {
		transform: scaleY(1.0);
		-webkit-transform: scaleY(1.0);
	}
}
</style>

</body>