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94 lines
2.5 KiB
HTML
94 lines
2.5 KiB
HTML
<!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>帧缓冲纹理([name])</h1>
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<p class="desc">
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这个类只能与 [page:WebGLRenderer.copyFramebufferToTexture]() 结合使用。
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</p>
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<code>
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const pixelRatio = window.devicePixelRatio;
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const textureSize = 128 * pixelRatio;
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// instantiate a framebuffer texture
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const frameTexture = new FramebufferTexture( textureSize, textureSize );
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// calculate start position for copying part of the frame data
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const vector = new Vector2();
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vector.x = ( window.innerWidth * pixelRatio / 2 ) - ( textureSize / 2 );
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vector.y = ( window.innerHeight * pixelRatio / 2 ) - ( textureSize / 2 );
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// render the scene
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renderer.clear();
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renderer.render( scene, camera );
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// copy part of the rendered frame into the framebuffer texture
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renderer.copyFramebufferToTexture( frameTexture, vector );
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</code>
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<h2>例子</h2>
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<p>[example:webgl_framebuffer_texture]</p>
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<h2>构造函数</h2>
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<h3>[name]( [param:Number width], [param:Number height] )</h3>
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<p>
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[page:Number width] -- 纹理的宽度<br />
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[page:Number height] -- 纹理的高度<br /><br />
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</p>
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<h2>属性</h2>
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<p>共有属性请参见其基类 [page:Texture Texture] </p>
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<h3>[property:Boolean generateMipmaps]</h3>
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<p>是否为 [name] 生成 mipmaps ，默认为`false`</p>
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<h3>[property:Boolean isFramebufferTexture]</h3>
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<p>只读，检查给定对象是否为 [name] 类型</p>
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<h3>[property:number magFilter]</h3>
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<p>
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纹理元素覆盖多个像素时如何对纹理进行采样。默认值为 [page:Textures THREE.NearestFilter] ，它使用最接近的纹理元素。
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<br /><br />
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更多细节详见 [page:Textures texture constants]
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</p>
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<h3>[property:number minFilter]</h3>
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<p>
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纹理元素覆盖少于一个像素时如何对纹理进行采样。默认值为 [page:Textures THREE.NearestFilter] ，它使用最近的纹理元素。
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<br /><br />
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更多细节详见 [page:Textures texture constants]
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</p>
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<h3>[property:Boolean needsUpdate]</h3>
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<p>默认为 `true` ，这是加载 canvas 数据所必需的</p>
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<h2>方法</h2>
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<p>共有方法请参见其基类 [page:Texture Texture] </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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