javascript
/
three.js
镜像自地址 https://github.com/tazdij/three.js.git


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

		<h1>[name]</h1>

		<p class="desc">
			A light that gets emitted from a single point in all directions. A common
			use case for this is to replicate the light emitted from a bare
			lightbulb.<br /><br />

			This light can cast shadows - see [page:PointLightShadow] page for
			details.
		</p>

		<h2>Code Example</h2>

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

		<h2>Examples</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>Constructor</h2>

		<h3>
			[name]( [param:Integer color], [param:Float intensity], [param:Number distance], [param:Float decay] )
		</h3>
		<p>
			[page:Integer color] - (optional) hexadecimal color of the light. Default
			is 0xffffff (white).<br />
			[page:Float intensity] - (optional) numeric value of the light's
			strength/intensity. Default is 1.<br />
			[page:Number distance] - Maximum range of the light. Default is 0 (no
			limit).<br />
			[page:Float decay] - The amount the light dims along the distance of the
			light. Default is 2.<br /><br />

			Creates a new [name].
		</p>

		<h2>Properties</h2>
		<p>See the base [page:Light Light] class for common properties.</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>
			A [page:PointLightShadow] used to calculate shadows for this light.<br /><br />

			The lightShadow's [page:LightShadow.camera camera] is set to a
			[page:PerspectiveCamera] with [page:PerspectiveCamera.fov fov] of 90,
			[page:PerspectiveCamera.aspect aspect] of 1, [page:PerspectiveCamera.near near] 
			clipping plane at 0.5 and [page:PerspectiveCamera.far far] clipping
			plane at 500.
		</p>

		<h2>Methods</h2>
		<p>See the base [page:Light Light] class for common methods.</p>

		<h3>[method:undefined dispose]()</h3>
		<p>
			Frees the GPU-related resources allocated by this instance. Call this
			method whenever this instance is no longer used in your app.
		</p>

		<h3>[method:this copy]( [param:PointLight source] )</h3>
		<p>
			Copies value of all the properties from the [page:PointLight source] to
			this PointLight.
		</p>

		<h2>Source</h2>

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