javascript
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three.js
kopia lustrzana https://github.com/tazdij/three.js.git


			
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		[page:LineSegments] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			Helper object to show the world-axis-aligned bounding box around an object. 
			It can be used in synergy with [page:Box3] items in order to easily compute the [link:https://en.wikipedia.org/wiki/Minimum_bounding_box Minimum Bounding Boxes] for objects, and use them for fast collision detection. See [page:Box3.intersect].
			Note that the object must have a [page:Geometry] or [page:BufferGeometry] for this to work,
			so it won't work with [page:Sprite Sprites].
		</p>


		<h2>Example</h2>

		<div>[example:webgl_helpers WebGL / helpers]</div>
		<div>[example:webgl_loader_nrrd WebGL / loader / nrrd]</div>
		<div>[example:webgl_buffergeometry_drawcalls advanced / buffergeometry / drawcalls]</div>


		<code>
		// Creating the object whose bounding box we want to compute
		var sphereGeom = new THREE.SphereGeometry();
		var sphereObject = new THREE.Mesh( sphereGeom, new THREE.MeshBasicMaterial( 0xff0000 ) );

		// Creating the helper and displaying it in the scene
		var helper = new THREE.BoxHelper( sphereObject, 0xffff00 );
		scene.add( helper );

		// Creating the actual bounding box (on which we can test intersection with other Box3 objects)
		var box3 = new THREE.Box3();
		// Shape and position the box after the helper
		box3.setFromObject( helper );

		// Let's move the sphere
		sphereObject.position.set( 7, 7, 7 );

		// Whenever the object is moved or rotated or scaled:
		helper.update(); 
		box3.setFromObject( helper );
		</code>


		<h2>Constructor</h2>


		<h3>[name]( [param:Object3D object], [param:Color color] )</h3>
		<p>
		[page:Object3D object]  -- (optional) the object3D to show the world-axis-aligned boundingbox.<br />
		[page:Color color] --  (optional) hexadecimal value that defines the box's color. Default is 0xffff00.<br /><br />

		Creates a new wireframe box that bounds the passed object. Internally this uses [page:Box3.setFromObject]
		to calculate the dimensions. Note that this includes any children.
		</p>

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


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

		<h3>[method:null update]()</h3>
		<p>
			Updates the helper's geometry to match the dimensions
			of the object, including any children. See [page:Box3.setFromObject].
		</p>

		<h3>[method:BoxHelper setFromObject]( [param:Object3D object] )</h3>
		<p>
			[page:Object3D object] - [page:Object3D] to create the helper of.<br /><br />

			Updates the wireframe box for the passed object.
		</p>

		<h2>Source</h2>

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