切换按钮“ENTER VR”在三个 js 中不起作用答案

【问题标题】：Toggle Button "ENTER VR" not working in three js切换按钮“ENTER VR”在三个 js 中不起作用
【发布时间】：2017-07-07 10:35:43
【问题描述】：

我在我的手机中使用谷歌浏览器 (59.0.3071.125)

我已启用：WebVR，我的 chrome 中的 Gamepad 在我第一次尝试时使用 chrome://flags/ 来支持 WEBVR 但是现在 2 天后它给出了这个例外：

未捕获（承诺中）DOMException：演示请求被拒绝。

我不知道为什么。我试图四处寻找，但我什么也没找到

下面是我试过的https://threejs.org/examples/?q=vr#webvr_cubes的代码

    <!DOCTYPE html>
<html lang="en">
    <head>
        <title>three.js webvr - cubes</title>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
        <!-- Origin Trial Token, feature = WebVR, origin = https://threejs.org, expires = 2017-06-13 -->
        <meta http-equiv="origin-trial" data-feature="WebVR" data-expires="2017-06-13" content="ApAQvHfiHMQB7SmRhfvCUX61adJaTA6pAu0Ry439jjeipa5lGm1RcTQynFoHGGcaSJkWfMOv7qK6pwSUb95ClQgAAABKeyJvcmlnaW4iOiJodHRwczovL3RocmVlanMub3JnOjQ0MyIsImZlYXR1cmUiOiJXZWJWUiIsImV4cGlyeSI6MTQ5NzMxMjAwMH0=">
        <style>
            body {
                font-family: Monospace;
                background-color: #101010;
                color: #fff;
                margin: 0px;
                overflow: hidden;
            }
            a {
                color: #f00;
            }
        </style>
    </head>
    <body>

        <script src="../build/three.js"></script>

        <script src="js/controls/VRControls.js"></script>
        <script src="js/effects/VREffect.js"></script>
        <script src="js/vr/WebVR.js"></script>

        <script>

            if ( WEBVR.isAvailable() === false ) {

                document.body.appendChild( WEBVR.getMessage() );

            }

            //

            var clock = new THREE.Clock();

            var container;
            var camera, scene, raycaster, renderer;
            var effect, controls;

            var room;
            var isMouseDown = false;

            var INTERSECTED;
            var crosshair;

            init();
            animate();

            function init() {

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

                var info = document.createElement( 'div' );
                info.style.position = 'absolute';
                info.style.top = '10px';
                info.style.width = '100%';
                info.style.textAlign = 'center';
                info.innerHTML = '<a href="http://threejs.org" target="_blank">three.js</a> webgl - interactive cubes';
                container.appendChild( info );

                scene = new THREE.Scene();

                camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 10 );
                scene.add( camera );

                crosshair = new THREE.Mesh(
                    new THREE.RingGeometry( 0.02, 0.04, 32 ),
                    new THREE.MeshBasicMaterial( {
                        color: 0xffffff,
                        opacity: 0.5,
                        transparent: true
                    } )
                );
                crosshair.position.z = - 2;
                camera.add( crosshair );

                room = new THREE.Mesh(
                    new THREE.BoxGeometry( 6, 6, 6, 8, 8, 8 ),
                    new THREE.MeshBasicMaterial( { color: 0x404040, wireframe: true } )
                );
                scene.add( room );

                scene.add( new THREE.HemisphereLight( 0x606060, 0x404040 ) );

                var light = new THREE.DirectionalLight( 0xffffff );
                light.position.set( 1, 1, 1 ).normalize();
                scene.add( light );

                var geometry = new THREE.BoxGeometry( 0.15, 0.15, 0.15 );

                for ( var i = 0; i < 200; i ++ ) {

                    var object = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: Math.random() * 0xffffff } ) );

                    object.position.x = Math.random() * 4 - 2;
                    object.position.y = Math.random() * 4 - 2;
                    object.position.z = Math.random() * 4 - 2;

                    object.rotation.x = Math.random() * 2 * Math.PI;
                    object.rotation.y = Math.random() * 2 * Math.PI;
                    object.rotation.z = Math.random() * 2 * Math.PI;

                    object.scale.x = Math.random() + 0.5;
                    object.scale.y = Math.random() + 0.5;
                    object.scale.z = Math.random() + 0.5;

                    object.userData.velocity = new THREE.Vector3();
                    object.userData.velocity.x = Math.random() * 0.01 - 0.005;
                    object.userData.velocity.y = Math.random() * 0.01 - 0.005;
                    object.userData.velocity.z = Math.random() * 0.01 - 0.005;

                    room.add( object );

                }

                raycaster = new THREE.Raycaster();

                renderer = new THREE.WebGLRenderer( { antialias: true } );
                renderer.setClearColor( 0x505050 );
                renderer.setPixelRatio( window.devicePixelRatio );
                renderer.setSize( window.innerWidth, window.innerHeight );
                renderer.sortObjects = false;
                container.appendChild( renderer.domElement );

                controls = new THREE.VRControls( camera );
                effect = new THREE.VREffect( renderer );

                WEBVR.getVRDisplay( function ( display ) {

                    document.body.appendChild( WEBVR.getButton( display, renderer.domElement ) );

                } );

                renderer.domElement.addEventListener( 'mousedown', onMouseDown, false );
                renderer.domElement.addEventListener( 'mouseup', onMouseUp, false );
                renderer.domElement.addEventListener( 'touchstart', onMouseDown, false );
                renderer.domElement.addEventListener( 'touchend', onMouseUp, false );

                //

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

            }

            function onMouseDown() {

                isMouseDown = true;

            }

            function onMouseUp() {

                isMouseDown = false;

            }

            function onWindowResize() {

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

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

            }

            //

            function animate() {

                effect.requestAnimationFrame( animate );
                render();

            }

            function render() {

                var delta = clock.getDelta() * 60;

                if ( isMouseDown === true ) {

                    var cube = room.children[ 0 ];
                    room.remove( cube );

                    cube.position.set( 0, 0, - 0.75 );
                    cube.position.applyQuaternion( camera.quaternion );
                    cube.userData.velocity.x = ( Math.random() - 0.5 ) * 0.02 * delta;
                    cube.userData.velocity.y = ( Math.random() - 0.5 ) * 0.02 * delta;
                    cube.userData.velocity.z = ( Math.random() * 0.01 - 0.05 ) * delta;
                    cube.userData.velocity.applyQuaternion( camera.quaternion );
                    room.add( cube );

                }

                // find intersections

                raycaster.setFromCamera( { x: 0, y: 0 }, camera );

                var intersects = raycaster.intersectObjects( room.children );

                if ( intersects.length > 0 ) {

                    if ( INTERSECTED != intersects[ 0 ].object ) {

                        if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );

                        INTERSECTED = intersects[ 0 ].object;
                        INTERSECTED.currentHex = INTERSECTED.material.emissive.getHex();
                        INTERSECTED.material.emissive.setHex( 0xff0000 );

                    }

                } else {

                    if ( INTERSECTED ) INTERSECTED.material.emissive.setHex( INTERSECTED.currentHex );

                    INTERSECTED = undefined;

                }

                // Keep cubes inside room

                for ( var i = 0; i < room.children.length; i ++ ) {

                    var cube = room.children[ i ];

                    cube.userData.velocity.multiplyScalar( 1 - ( 0.001 * delta ) );

                    cube.position.add( cube.userData.velocity );

                    if ( cube.position.x < - 3 || cube.position.x > 3 ) {

                        cube.position.x = THREE.Math.clamp( cube.position.x, - 3, 3 );
                        cube.userData.velocity.x = - cube.userData.velocity.x;

                    }

                    if ( cube.position.y < - 3 || cube.position.y > 3 ) {

                        cube.position.y = THREE.Math.clamp( cube.position.y, - 3, 3 );
                        cube.userData.velocity.y = - cube.userData.velocity.y;

                    }

                    if ( cube.position.z < - 3 || cube.position.z > 3 ) {

                        cube.position.z = THREE.Math.clamp( cube.position.z, - 3, 3 );
                        cube.userData.velocity.z = - cube.userData.velocity.z;

                    }

                    cube.rotation.x += cube.userData.velocity.x * 2 * delta;
                    cube.rotation.y += cube.userData.velocity.y * 2 * delta;
                    cube.rotation.z += cube.userData.velocity.z * 2 * delta;

                }

                controls.update();
                effect.render( scene, camera );

            }

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

【问题讨论】：

我有同样的问题。你找到解决办法了吗？
是的，我从 VREffect 更改为 StereoEffect 和 VRControls 更改为 DeviceOrientationControls 并删除了 webvr：我关注了这篇文章，它帮助我做我想做的事情sitepoint.com/bringing-vr-to-web-google-cardboard-three-js

标签： google-chrome three.js webvr

【解决方案1】：

我刚刚遇到了一个非常相似的问题。似乎 VRButton 不适用于 requestAnimationFrame。相反，您需要使用 renderer.setAnimiationLoop。

您的代码：

function animate() {
  effect.requestAnimationFrame( animate );
  render();
}

改成这样：

function animate() {
  renderer.setAnimationLoop(() => { render(); });
}

【讨论】：