javascript
/
three.js
cermin dari https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="zh">
	<head>
		<meta charset="utf-8" />
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	<body>
		[page:Object3D] &rarr; [page:Light] &rarr;

		<h1>点光源（[name]）</h1>

		<p class="desc">
			从一个点向各个方向发射的光源。一个常见的例子是模拟一个灯泡发出的光。
			<br /><br />
			该光源可以投射阴影 - 跳转至 [page:PointLightShadow] 查看更多细节。
		</p>

		<h2>代码示例</h2>

		<code>
		const light = new THREE.PointLight( 0xff0000, 1, 100 );
		light.position.set( 50, 50, 50 );
		scene.add( light );
		</code>

		<h2>例子</h2>

		<p>
			[example:webgl_lights_pointlights lights / pointlights ]<br />
			[example:webgl_effects_anaglyph effects / anaglyph ]<br />
			[example:webgl_geometry_text geometry / text ]<br />
			[example:webgl_lensflares lensflares ]
		</p>

		<h2>构造器（Constructor）</h2>

		<h3>[name]( [param:Integer color], [param:Float intensity], [param:Number distance], [param:Float decay] )</h3>
		<p>
			[page:Integer color] - (可选参数)) 十六进制光照颜色。 缺省值 0xffffff (白色)。<br />
			[page:Float intensity] - (可选参数) 光照强度。 缺省值 1。 <br />
			[page:Number distance] - 这个距离表示从光源到光照强度为0的位置。
			当设置为0时，光永远不会消失(距离无穷大)。缺省值 0.<br />
			[page:Float decay] - 沿着光照距离的衰退量。缺省值 2。<br /><br />

			创建一个新的点光源（PointLight）。
		</p>

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

		<h3>[property:Boolean castShadow]</h3>
		<p>
			If set to `true` light will cast dynamic shadows. *Warning*: This is expensive and
			requires tweaking to get shadows looking right. See the [page:PointLightShadow] for details.
			The default is `false`.
		</p>

		<h3>[property:Float decay]</h3>
		<p>
			The amount the light dims along the distance of the light. Default is `2`.<br />
			In context of physically-correct rendering the default value should not be changed.
		</p>

		<h3>[property:Float distance]</h3>
		<p>
			`Default mode` — When distance is zero, light does not attenuate. When
			distance is non-zero, light will attenuate linearly from maximum intensity
			at the light's position down to zero at this distance from the light.
		</p>
		<p>
			When [page:WebGLRenderer.useLegacyLights legacy lighting mode] is disabled —
			When distance is zero, light will attenuate according to inverse-square
			law to infinite distance. When distance is non-zero, light will attenuate
			according to inverse-square law until near the distance cutoff, where it
			will then attenuate quickly and smoothly to 0. Inherently, cutoffs are not
			physically correct.
		</p>
		<p>Default is `0.0`.</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 luminous intensity of the light measured in candela
			(cd).<br /><br />

			Changing the intensity will also change the light's power.
		</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:PointLightShadow shadow]</h3>
		<p>
			[page:PointLightShadow]用与计算此光照的阴影。<br /><br />

			此对象的摄像机被设置为 [page:PerspectiveCamera.fov fov] 为90度，[page:PerspectiveCamera.aspect aspect]为1，
			近裁剪面 [page:PerspectiveCamera.near near] 为0，远裁剪面[page:PerspectiveCamera.far far]
			为500的透视摄像机 [page:PerspectiveCamera]。
		</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:PointLight source] )</h3>
		<p>
			将所有属性的值从源 [page:PointLight source] 复制到此点光源对象。
		</p>

		<h2>Source</h2>

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