javascript
/
three.js
дзеркало https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js vr - layers</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> media and projection layers<br/>
			(Oculus Browser 16.1+)
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import { VRButton } from './jsm/webxr/VRButton.js';
			import { XRControllerModelFactory } from './jsm/webxr/XRControllerModelFactory.js';
			import { XRHandModelFactory } from './jsm/webxr/XRHandModelFactory.js';

			let container;
			let camera, scene, renderer;
			let hand1, hand2;
			let controller1, controller2;
			let controllerGrip1, controllerGrip2;

			let controls;
			let video;
			let snellenTexture;
			let quadLayer;

			// Data shared between the THREE.Mesh on the left side and WebXR Layer on the right side for
			// the eye chart. See https://en.wikipedia.org/wiki/Snellen_chart for details about the math.
			//
			// The image was designed so that each 2x2px block on the 20/20 line subtends 1 minute of
			// arc. That is
			//    tan(1/60 deg) * 6.1m * 160px/142mm = 2px
			// per block on line 8.
			//
			// This fidelity is beyond any modern consumer headset since it would require ~60px/deg of
			// resolution. The Quest has ~16ppd and the Quest 2 has ~20ppd so only lines 3 or 4 will be
			// legible when using layers. Without layers, you lose ~sqrt(2) in resolution due to the
			// extra resampling.
			const snellenConfig = {
				// The height & width of the WebXR layer needs to match the given image size.
				widthPx: 320,
				heightPx: 450,

				x: 0, // +/- widthMeters/2
				y: 1.5,

				z: - 6.1, // 20/20 vision @ 20ft = 6.1m

				widthMeters: .268, // 320px image * (142mm/160px scale factor)
				heightMeters: .382 // 450px image * (142mm/160px scale factor)
			};

			init();
			animate();

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 10 );
				camera.position.set( 0, 1.6, 3 );

				controls = new OrbitControls( camera, container );
				controls.target.set( 0, 1.6, 0 );
				controls.update();

				scene.add( new THREE.HemisphereLight( 0x808080, 0x606060 ) );

				const light = new THREE.DirectionalLight( 0xffffff );
				light.position.set( 0, 6, 0 );
				light.castShadow = true;
				light.shadow.camera.top = 2;
				light.shadow.camera.bottom = - 2;
				light.shadow.camera.right = 2;
				light.shadow.camera.left = - 2;
				light.shadow.mapSize.set( 4096, 4096 );
				scene.add( light );

				//

				renderer = new THREE.WebGLRenderer( { antialias: true, alpha: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setClearAlpha(1);
				renderer.setClearColor(new THREE.Color(0), 0);
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.outputEncoding = THREE.sRGBEncoding;
				renderer.shadowMap.enabled = true;
				renderer.xr.enabled = true;

				container.appendChild( renderer.domElement );

				document.body.appendChild( VRButton.createButton( renderer ) );

				// controllers

				controller1 = renderer.xr.getController( 0 );
				scene.add( controller1 );

				controller2 = renderer.xr.getController( 1 );
				scene.add( controller2 );

				const controllerModelFactory = new XRControllerModelFactory();
				const handModelFactory = new XRHandModelFactory().setPath( "./models/fbx/" );

				// Hand 1
				controllerGrip1 = renderer.xr.getControllerGrip( 0 );
				controllerGrip1.add( controllerModelFactory.createControllerModel( controllerGrip1 ) );
				scene.add( controllerGrip1 );

				hand1 = renderer.xr.getHand( 0 );
				hand1.add( handModelFactory.createHandModel( hand1 ) );

				scene.add( hand1 );

				// Hand 2
				controllerGrip2 = renderer.xr.getControllerGrip( 1 );
				controllerGrip2.add( controllerModelFactory.createControllerModel( controllerGrip2 ) );
				scene.add( controllerGrip2 );

				hand2 = renderer.xr.getHand( 1 );
				hand2.add( handModelFactory.createHandModel( hand2 ) );
				scene.add( hand2 );

				//

				const geometry = new THREE.BufferGeometry().setFromPoints( [ new THREE.Vector3( 0, 0, 0 ), new THREE.Vector3( 0, 0, - 1 ) ] );

				const line = new THREE.Line( geometry );
				line.name = 'line';
				line.scale.z = 5;

				controller1.add( line.clone() );
				controller2.add( line.clone() );

				// Eye chart
				snellenTexture = new THREE.TextureLoader().load( "textures/snellen.png" );
				const snellenMesh = new THREE.Mesh(
					new THREE.PlaneGeometry( snellenConfig.widthMeters, snellenConfig.heightMeters ),
					new THREE.MeshBasicMaterial( { map: snellenTexture } ) );
				snellenMesh.position.x = snellenConfig.x - snellenConfig.widthMeters / 2;
				snellenMesh.position.y = snellenConfig.y;
				snellenMesh.position.z = snellenConfig.z;
				scene.add( snellenMesh );

				//

				window.addEventListener( 'resize', onWindowResize, false );

				video = document.createElement('video');
				video.loop = true;
				video.src = 'textures/MaryOculus.webm';
			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}
			//

			function animate() {

				renderer.setAnimationLoop( render );

			}

			function render( t, frame ) {

				const xr = renderer.xr;
				const session = xr.getSession();
				const gl = renderer.getContext();

				// Init layers once in immersive mode and video is ready.
				if ( session && session.renderState.layers !== undefined && session.hasMediaLayer === undefined && video.readyState >= 2 ) {

					session.hasMediaLayer = true;
					session.requestReferenceSpace( 'local' ).then( ( refSpace ) => {

						// Create Quad layer for Snellen chart.
						const glBinding = new XRWebGLBinding( session, gl );
						quadLayer = glBinding.createQuadLayer( {
							width: snellenConfig.widthMeters / 2,
							height: snellenConfig.heightMeters / 2,
							viewPixelWidth: snellenConfig.widthPx,
							viewPixelHeight: snellenConfig.heightPx,
							space: refSpace, layout: "mono",
							transform: new XRRigidTransform( { x: snellenConfig.x + snellenConfig.widthMeters / 2, y: snellenConfig.y, z: snellenConfig.z } )
						} );

						// Create background EQR video layer.
						const mediaBinding = new XRMediaBinding( session );
						const equirectLayer = mediaBinding.createEquirectLayer( video, { space: refSpace, layout: "stereo-left-right" } );

						session.updateRenderState( { layers: [ equirectLayer, quadLayer, session.renderState.layers[ 0 ] ] } );
						video.play();

					} );

				}

				// Copy image to canvas as required.
				// needsRedraw is set on creation or if the underlying GL resources of a layer are lost.
				if ( quadLayer && quadLayer.needsRedraw ) {

					const glBinding = new XRWebGLBinding( session, gl );
					const glayer = glBinding.getSubImage( quadLayer, frame );
					renderer.state.bindTexture( gl.TEXTURE_2D, glayer.colorTexture );
					gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, true );
					gl.texSubImage2D( gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, snellenTexture.image );

				}

				renderer.render( scene, camera );

			}

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