Video 视频纹理播放但显示黑色_Video_Three.js_Textures

Video 视频纹理播放但显示黑色

video three.js

Video 视频纹理播放但显示黑色,video,three.js,textures,Video,Three.js,Textures,我正在尝试创建一个视频纹理。我的代码会将视频添加到我的场景中，但是我的立方体是黑色的。视频就在那里的某个地方，因为我可以听到在我的浏览器中播放的音频。我刚接触three.js，所以我不确定自己做错了什么。我有一个照相机和三盏灯。我可以看到场景中的其他对象，它们的纹理是可见的。我的代码改编自。以下是我的HTML代码： <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8">

我正在尝试创建一个视频纹理。我的代码会将视频添加到我的场景中，但是我的立方体是黑色的。视频就在那里的某个地方，因为我可以听到在我的浏览器中播放的音频。我刚接触three.js，所以我不确定自己做错了什么。我有一个照相机和三盏灯。我可以看到场景中的其他对象，它们的纹理是可见的。我的代码改编自。以下是我的HTML代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <script src="libraries/three.js"></script>
    <script src="libraries/OBJLoader2.js"></script>
    <script src="libraries/OrbitControls.js"></script>
    <script src="libraries/MtlLoader.js"></script>
    <script src="libraries/DDSLoader.js"></script>
</head>

<body>
<script src="libraries/main.js"></script>
</body>
</html>

您必须为视频创建画布，以便使用它构建纹理。此外，还必须刷新渲染循环中的每个帧

var renderer;
var scene;
var camera;
var cameraControl;
var loader;
var updateFcts = [];
var video;
var videoImageContext;
var videoTexture;

function createRenderer() {
    renderer = new THREE.WebGLRenderer();
    renderer.setClearColor(0x111111, 1.0);
    renderer.setSize(window.innerWidth, window.innerHeight);
    renderer.shadowMap.enabled = true;
}

function createCamera() {
    camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 0.1, 1000);
    camera.position.x = 0;
    camera.position.y = 100;
    camera.position.z = 450;
    camera.lookAt(scene.position);
    cameraControl = new THREE.OrbitControls(camera);
}

var THREEx = THREEx || {}
THREEx.VideoTexture = function(url) {
    video = document.createElement('video');

    video.autoplay = true;
    video.loop = true;
    video.src = url;
    video.load();
    video.play();

    videoImage = document.createElement('canvas');
    videoImage.width = 320;
    videoImage.height = 240;
    videoImageContext = videoImage.getContext('2d');
    videoImageContext.fillStyle = '#000000';
    videoImageContext.fillRect(0, 0, videoImage.width, videoImage.height);

    this.texture = new THREE.Texture(videoImage);
    this.texture.minFilter = THREE.LinearFilter;
    this.texture.magFilter = THREE.LinearFilter; 

    this.destroy = function() {
        video.pause()
    }
}

function createVideo() {
    videoTexture = new THREEx.VideoTexture('myvideo.mp4')
    updateFcts.push(function(delta, now) {
        videoTexture.update(delta, now)
    });
    var geometry = new THREE.CubeGeometry(10, 50, 10);
    var material = new THREE.MeshBasicMaterial({
        map: videoTexture.texture,
        side: THREE.DoubleSide
    });
    var mesh = new THREE.Mesh(geometry, material);
    scene.add(mesh);
    updateFcts.push(function(delta, now) {
        mesh.rotation.x += 1 * delta;
        mesh.rotation.y += 2 * delta;
    });
}

function createLight() {
    var spotLight = new THREE.SpotLight(0xffffff);
    spotLight.position.set(10, 40, 20);
    spotLight.shadowCameraNear = 20;
    spotLight.shadowCameraFar = 50;
    spotLight.castShadow = true;
    scene.add(spotLight);
    var ambient = new THREE.AmbientLight(0x444444);
    ambient.castShadow = true;
    scene.add(ambient);
    var directionalLight = new THREE.DirectionalLight(0xffeedd);
    directionalLight.position.set(0, 0.5, 0.5).normalize();
    scene.add(directionalLight);
}

function init() {
    scene = new THREE.Scene();
    createRenderer();
    createCamera();
    createLight();
    createVideo();
    document.body.appendChild(renderer.domElement);
    render();
}

function render() {
    cameraControl.update();
    if (video.readyState === video.HAVE_ENOUGH_DATA) {
        videoImageContext.drawImage(video, 0, 0);
        if (videoTexture)
            videoTexture.texture.needsUpdate = true;
    }
    renderer.render(scene, camera);
    requestAnimationFrame(render);
}

init();

我已经改变了THREEx.VideoTexture函数和渲染循环，并用r75和works进行了测试

我遇到了类似的问题：将摄影机源渲染到纹理会导致黑色对象（黑色纹理）。在我的例子中，这是由于没有设置

texture.needsUpdate=true

。因此，我自己的代码类似于：

updateTexture = function(videoDomElement){
    var cameraTexture = new THREE.Texture(videoDomElement);
    cameraTexture.needsUpdate = true;
    var material = new THREE.MeshLambertMaterial({map: cameraTexture});
    material.needsUpdate = true;
    existingObject.material = material;
}

谢谢你，我试着添加画布，但也没能成功，但是你的代码帮了我的忙！我知道我也必须改变我的渲染功能，所以你帮我澄清了这一点：）视频不需要画布。三个.js中没有一个为视频创建单独的画布

updateTexture = function(videoDomElement){
    var cameraTexture = new THREE.Texture(videoDomElement);
    cameraTexture.needsUpdate = true;
    var material = new THREE.MeshLambertMaterial({map: cameraTexture});
    material.needsUpdate = true;
    existingObject.material = material;
}