samien
/
three.js
mirror da https://github.com/mrdoob/three.js.git


			
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	<body>
		[page:Object3D] &rarr; [page:Light] &rarr;

		<h1>平面光光源（[name]）</h1>

		<p class="desc">
			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 />

			注意事项:
			<ul>
				<li>不支持阴影。</li>
				<li>只支持 [page:MeshStandardMaterial MeshStandardMaterial] 和 [page:MeshPhysicalMaterial MeshPhysicalMaterial] 两种材质。</li>
				<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>
			</ul>
		</p>

		<h2>代码示例</h2>

		<code>
		const width = 10;
		const height = 10;
		const intensity = 1;
		const rectLight = new THREE.RectAreaLight( 0xffffff, intensity,  width, height );
		rectLight.position.set( 5, 5, 0 );
		rectLight.lookAt( 0, 0, 0 );
		scene.add( rectLight )

		rectLightHelper = new RectAreaLightHelper( rectLight );
		scene.add( rectLightHelper );
		</code>

		<h2>例子</h2>

		<p>
			[example:webgl_lights_rectarealight WebGL / rectarealight ]
		</p>

		<h2>构造器（Constructor）</h2>


		<h3>[name]( [param:Integer color], [param:Float intensity], [param:Float width], [param:Float height] )</h3>
		<p>
			[page:Integer color] -  (可选参数) 十六进制数字表示的光照颜色。缺省值为 0xffffff (白色)<br />
			[page:Float intensity] - (可选参数) 光源强度／亮度 。缺省值为 1。<br />
			[page:Float width] - (可选参数) 光源宽度。缺省值为 10。<br />
			[page:Float height] - (可选参数) 光源高度。缺省值为 10。<br /><br />

			创建一个新的平面光。
		</p>

		<h2>属性（Properties）</h2>
		<p>
			公共属性请查看基类[page:Light Light]。
		</p>

		<h3>[property:Float height]</h3>
		<p>The height of the light.</p>

		<h3>[property:Float intensity]</h3>
		<p>
			The light's intensity. Default is `1`.<br />
			When [page:WebGLRenderer.useLegacyLights legacy lighting mode] is disabled,
			intensity is the luminance (brightness) of the light measured in nits
			(cd/m^2).<br /><br />

			Changing the intensity will also change the light's power.
		</p>

		<h3>[property:Boolean isRectAreaLight]</h3>
		<p>
			Read-only flag to check if a given object is of type [name].
		</p>

		<h3>[property:Float power]</h3>
		<p>
			The light's power.<br />
			When [page:WebGLRenderer.useLegacyLights legacy lighting mode] is disabled,
			power is the luminous power of the light measured in lumens (lm).
			<br /><br />

			Changing the power will also change the light's intensity.
		</p>

		<h3>[property:Float width]</h3>
		<p>The width of the light.</p>

		<h2>方法（Methods）</h2>
		<p>
			公共方法请查看基类 [page:Light Light]。
		</p>


		<h3>[method:this copy]( [param:RectAreaLight source] )</h3>
		<p>
			将所有属性的值从源 [page:RectAreaLight source] 复制到此平面光光源对象。
		</p>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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