javascript
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three.js
mirror of https://github.com/tazdij/three.js.git


			
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		[page:LineSegments] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			Helper object to graphically show the world-axis-aligned bounding box around an object. The actual bounding box is handled with [page:Box3], this is just a visual helper for debugging.
			It can be automatically resized with the [page:BoxHelper.update] method when the object it's created from is transformed.
			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)
		sphereObject.geometry.computeBoundingBox();
		var BBox = new THREE.Box3(
			sphereObject.geometry.boundingBox.min,
  			sphereObject.geometry.boundingBox.max
		);

		// Moving the sphere
		sphereObject.position.set( 7, 7, 7 );

		// Updating both the bounding box and the helper
		// (to repeat each time the object is moved, rotated or scaled) 
		BBox.copy( sphereObject.geometry.boundingBox ).applyMatrix4( sphereObject.matrixWorld );
		helper.update();
		</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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