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112 lines
4.2 KiB
112 lines
4.2 KiB
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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[page:Texture] →
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<h1>视频纹理（[name]）</h1>
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<p class="desc">
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创建一个使用视频来作为贴图的纹理对象。
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</p>
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<p>
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Note: After the initial use of a texture, the video cannot be changed. Instead, call [page:.dispose]() on the texture and instantiate a new one.
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</p>
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<h2>代码示例</h2>
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<code>
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// assuming you have created a HTML video element with id="video"
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const video = document.getElementById( 'video' );
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const texture = new THREE.VideoTexture( video );
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</code>
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<h2>例子</h2>
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<p>
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[example:webgl_materials_video materials / video]<br />
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[example:webgl_materials_video_webcam materials / video / webcam]<br />
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[example:webgl_video_kinect video / kinect]<br />
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[example:webgl_video_panorama_equirectangular video / panorama / equirectangular]<br />
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[example:webxr_vr_video vr / video]
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</p>
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<h2>构造函数</h2>
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<h3>[name]( [param:Video video], [param:Constant mapping], [param:Constant wrapS], [param:Constant wrapT], [param:Constant magFilter], [param:Constant minFilter], [param:Constant format], [param:Constant type], [param:Number anisotropy] )</h3>
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<p>
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[page:Video video] -- 将被作为纹理贴图来使用的Video元素。<br />
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[page:Constant mapping] -- 纹理贴图将被如何应用（映射）到物体上，它是[page:Textures THREE.UVMapping]中的对象类型。
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请参阅[page:Textures mapping constants]（映射模式常量）来了解其他选项。<br />
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[page:Constant wrapS] -- 默认值是[page:Textures THREE.ClampToEdgeWrapping].
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请参阅[page:Textures wrap mode constants]（包裹模式常量）来了解其他选项。<br />
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[page:Constant wrapT] -- 默认值是[page:Textures THREE.ClampToEdgeWrapping].
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请参阅[page:Textures wrap mode constants]（包裹模式常量）来了解其他选项。<br />
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[page:Constant magFilter] -- 当一个纹素覆盖大于一个像素时，贴图将如何采样。
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其默认值为[page:Textures THREE.LinearFilter]。请参阅[page:Textures magnification filter constants]（放大滤镜常量）来了解其它选项。<br />
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[page:Constant minFilter] -- 当一个纹素覆盖小于一个像素时，贴图将如何采样。
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其默认值为[page:Textures THREE.LinearFilter]。请参阅[page:Textures minification filter constants]（缩小滤镜常量）来了解其它选项。<br />
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[page:Constant format] -- The default is [page:Textures THREE.RGBAFormat].
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请参阅[page:Textures format constants]（格式常量）来了解各个选项。<br />
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[page:Constant type] -- 默认值是[page:Textures THREE.UnsignedByteType].
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请参阅[page:Textures type constants]（类型常量）来了解其他选项。<br />
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[page:Number anisotropy] -- 沿着轴，通过具有最高纹素密度的像素的采样数。
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默认情况下，这个值为1。设置一个较高的值将会比基本的mipmap产生更清晰的效果，代价是需要使用更多纹理样本。
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使用[page:WebGLrenderer.getMaxAnisotropy renderer.getMaxAnisotropy]() 来查询GPU中各向异性的最大有效值；这个值通常是2的幂。<br /><br />
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</p>
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<h2>属性</h2>
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<p>
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共有属性请参见其基类[page:Texture Texture]。
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</p>
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<h3>[property:Boolean generateMipmaps]</h3>
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<p>
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Whether to generate mipmaps. `false` by default.
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</p>
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<h3>[property:Boolean isVideoTexture]</h3>
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<p>
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Read-only flag to check if a given object is of type [name].
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</p>
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<h3>[property:Boolean needsUpdate]</h3>
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<p>
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在这里，你不必手动设置这个值，因为它是由[page:VideoTexture.update update]()方法来进行控制的。
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</p>
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<h2>方法</h2>
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<p>
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共有方法请参见其基类[page:Texture Texture]。
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</p>
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<h3>[method:undefined update]()</h3>
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<p>
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在每一次新的一帧可用时，这个方法将被自动调用，
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并将[property:Boolean needsUpdate]设置为*true*。
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</p>
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<h2>源代码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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</p>
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</body>
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</html>
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