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<!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:Object3D] → [page:Light] →
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<h1>平面光光源（[name]）</h1>
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<p class="desc">
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平面光光源从一个矩形平面上均匀地发射光线。这种光源可以用来模拟像明亮的窗户或者条状灯光光源。<br /><br />
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注意事项:
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<ul>
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<li>不支持阴影。</li>
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<li>只支持 [page:MeshStandardMaterial MeshStandardMaterial] 和 [page:MeshPhysicalMaterial MeshPhysicalMaterial] 两种材质。</li>
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<li>你必须在你的场景中加入 [link:https://threejs.org/examples/jsm/lights/RectAreaLightUniformsLib.js RectAreaLightUniformsLib]，并调用 `init()`。</li>
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</ul>
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</p>
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<h2>代码示例</h2>
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<code>
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const width = 10;
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const height = 10;
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const intensity = 1;
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const rectLight = new THREE.RectAreaLight( 0xffffff, intensity, width, height );
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rectLight.position.set( 5, 5, 0 );
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rectLight.lookAt( 0, 0, 0 );
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scene.add( rectLight )
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const rectLightHelper = new RectAreaLightHelper( rectLight );
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scene.add( rectLightHelper );
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</code>
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<h2>例子</h2>
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<p>
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[example:webgl_lights_rectarealight WebGL / rectarealight ]
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</p>
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<h2>构造器（Constructor）</h2>
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<h3>[name]( [param:Color color], [param:Float intensity], [param:Float width], [param:Float height] )</h3>
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<p>
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[page:Color color] -（可选）一个表示颜色的 Color 的实例、字符串或数字，默认为一个白色（0xffffff）的 [page:Color Color] 对象。<br />
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[page:Float intensity] -（可选）光源强度／亮度 。默认值为 1。<br />
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[page:Float width] -（可选）光源宽度。默认值为 10。<br />
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[page:Float height] -（可选）光源高度。默认值为 10。<br /><br />
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创建一个新的平面光。
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</p>
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<h2>属性（Properties）</h2>
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<p>
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公共属性请查看基类[page:Light Light]。
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</p>
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<h3>[property:Float height]</h3>
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<p>光源高度。</p>
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<h3>[property:Float intensity]</h3>
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<p>
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光源的强度。默认值为 `1`。<br />
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单位是尼特（cd/m^2）。<br /><br />
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改变该值会影响到 `power` 的值。
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</p>
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<h3>[property:Boolean isRectAreaLight]</h3>
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<p>
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只读，用于检查对象的类型是否为 [name]。
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</p>
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<h3>[property:Float power]</h3>
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<p>
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光源的功率。<br />
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单位为流明（lm）。<br /><br />
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改变该值会影响到 `intensity` 的值。
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</p>
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<h3>[property:Float width]</h3>
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<p>光源宽度。</p>
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<h2>方法（Methods）</h2>
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<p>
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公共方法请查看基类 [page:Light Light]。
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</p>
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<h3>[method:this copy]( [param:RectAreaLight source] )</h3>
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<p>
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将所有属性的值从源 [page:RectAreaLight source] 复制到此平面光光源对象。
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</p>
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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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