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


			
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		[page:Object3D] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			Helper object to assist with visualizing a [page:DirectionalLight]'s effect on the scene.

			This consists of plane and a line representing the light's position and direction.
		</p>

		<h2>Code Example</h2>

		<code>
		const light = new THREE.DirectionalLight( 0xFFFFFF );
		const helper = new THREE.DirectionalLightHelper( light, 5 );
		scene.add( helper );
		</code>

		<h2>Constructor</h2>


		<h3>[name]( [param:DirectionalLight light], [param:Number size], [param:Hex color] )</h3>
		<p>
			[page:DirectionalLight light]-- The light to be visualized. <br /><br />

			[page:Number size] -- (optional) dimensions of the plane. Default is `1`.<br /><br />

			[page:Hex color] -- (optional) if this is not the set the helper will take the color of the light.
		</p>


		<h2>Properties</h2>
		<p>See the base [page:Object3D] class for common properties.</p>


		<h3>[property:Line lightPlane]</h3>
		<p>Contains the line mesh showing the location of the directional light.</p>

		<h3>[property:DirectionalLight light]</h3>
		<p>Reference to the [page:DirectionalLight directionalLight] being visualized.</p>

		<h3>[property:Object matrix]</h3>
		<p>Reference to the light's [page:Object3D.matrixWorld matrixWorld].</p>

		<h3>[property:Object matrixAutoUpdate]</h3>
		<p>
			See [page:Object3D.matrixAutoUpdate]. Set to `false` here as the helper is using the
			light's [page:Object3D.matrixWorld matrixWorld].
		</p>

		<h3>[property:hex color]</h3>
		<p>
			The color parameter passed in the constructor. Default is `undefined`. If this is changed,
			the helper's color will update the next time [page:.update update] is called.
		</p>


		<h2>Methods</h2>
		<p>See the base [page:Object3D] class for common properties.</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:undefined update]()</h3>
		<p>Updates the helper to match the position and direction of the [page:.light directionalLight] being visualized.</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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