在three.js中将视频添加为纹理 [英] Adding video as Texture in three.js

问题描述

我正在研究Three.js的这个例子：

图像正常呈现，但我不知道看不到视频播放。它的位置只有白色文字。没有其他的。

我是Three.js的新手，我第一次尝试将视频用作纹理。请告诉我如何在指定区域播放视频，请帮助我。

解决方案

检查来源这个页面。

你可以看到他在做什么更多让他的视频正常工作。

具体来说，将视频绘制到画布上并使用画布作为材质的纹理。

  //创建视频元素
 video = document.createElement（'video'）; 
 video.src =textures / videos / Row1Col1.ogv; 
 video.load（）; //设置/更改源后必须调用
 video.play（）; 
 videoImage = document.createElement（'canvas'）; 
 videoImage.width = 480; 
 videoImage.height = 204; 
 
 videoImageContext = videoImage.getContext（'2d'）; 
 //如果没有视频，则为背景颜色
 videoImageContext.fillStyle ='＃000000'; 
 videoImageContext.fillRect（0,0，videoImage.width，videoImage.height）; 
 
 videoTexture = new THREE.Texture（videoImage）; 
 videoTexture.minFilter = THREE.LinearFilter; 
 videoTexture.magFilter = THREE.LinearFilter; 
  

I am working on this example of Three.js: http://threejs.org/examples/#canvas_geometry_panorama_fisheye

In this example, instead of using 6 images, I am using 5 images and one video as a texture (The video format is .ogv). I have edited the above example as follows to achieve what I desire:

video = document.createElement('video');
video.autoplay = true;
video.src = "textures/videos/Row1Col1.ogv";
var videoTexture = new THREE.Texture(video);
    videoTexture.needsUpdate = true;

var materials = [
    videoTexture, // right
    loadTexture( 'textures/cube/Park2/negx.jpg' ), // left
    loadTexture( 'textures/cube/Park2/posy.jpg' ), // top
    loadTexture( 'textures/cube/Park2/negy.jpg' ), // bottom
    loadTexture( 'textures/cube/Park2/posz.jpg' ), // back
    loadTexture( 'textures/cube/Park2/negz.jpg' ) // front
];

mesh = new THREE.Mesh( 
    new THREE.BoxGeometry( 300, 300, 300, 32, 32, 32 ), 
    new THREE.MultiMaterial( materials ) 
);

The rest of the code is exactly same as in the aforementioned example.

Instead of getting the desired result (which has five images rendered onto the sphere and one video playing on one of the 'side'), I am getting this:

The images are being rendered fine, but I don't see a video playing. There's just white text in it's place. Nothing else.

I am new to Three.js and I am trying to use videos as textures for the first time. Please help me out by letting me know that how can I get the video played, in the specified region.

解决方案

Check the source of THIS page.
You can see he is doing a bit more to get his video working.
Specifically, drawing the video onto a canvas and using the canvas as the texture of the material.

// create the video element
video = document.createElement( 'video' );
video.src = "textures/videos/Row1Col1.ogv";
video.load(); // must call after setting/changing source
video.play();
videoImage = document.createElement( 'canvas' );
videoImage.width = 480;
videoImage.height = 204;

videoImageContext = videoImage.getContext( '2d' );
// background color if no video present
videoImageContext.fillStyle = '#000000';
videoImageContext.fillRect( 0, 0, videoImage.width, videoImage.height );

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

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