midas
/
threejs-obj-space


			
				
					
						
						
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		[page:Loader] &rarr;
		<h1>[name]</h1>

		<p class="desc">
			A loader for geometry compressed with the Draco library. <br /><br />
			[link:https://google.github.io/draco/ Draco] is an open source library for compressing and
			decompressing 3D meshes and point clouds. Compressed geometry can be significantly smaller,
			at the cost of additional decoding time on the client device.
		</p>

		<p>
			Standalone Draco files have a <em>.drc</em> extension, and contain vertex positions,
			normals, colors, and other attributes. Draco files <em>do not</em> contain materials,
			textures, animation, or node hierarchies – to use these features, embed Draco geometry
			inside of a glTF file. A normal glTF file can be converted to a Draco-compressed glTF file
			using [link:https://github.com/AnalyticalGraphicsInc/gltf-pipeline glTF-Pipeline]. When
			using Draco with glTF, an instance of DRACOLoader will be used internally by [page:GLTFLoader].
		</p>

		<h2>Example</h2>

		<code>
		// Instantiate a loader
		var loader = new THREE.DRACOLoader();

		// Specify path to a folder containing WASM/JS decoding libraries.
		loader.setDecoderPath( '/examples/js/libs/draco/' );

		// Optional: Pre-fetch Draco WASM/JS module.
		loader.preload();

		// Load a Draco geometry
		loader.load(
			// resource URL
			'model.drc',
			// called when the resource is loaded
			function ( geometry ) {

				var material = new THREE.MeshStandardMaterial( { color: 0x606060 } );
				var mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

			},
			// called as loading progresses
			function ( xhr ) {

				console.log( ( xhr.loaded / xhr.total * 100 ) + '% loaded' );

			},
			// called when loading has errors
			function ( error ) {

				console.log( 'An error happened' );

			}
		);
		</code>

		[example:webgl_loader_draco]

		<h2>Browser compatibility</h2>

		<p>DRACOLoader relies on ES6 [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise Promises],
		which are not supported in IE11. To use the loader in IE11, you must
		[link:https://github.com/stefanpenner/es6-promise include a polyfill]
		providing a Promise replacement. DRACOLoader will automatically use
		either the JS or the WASM decoding library, based on browser
		capabilities.</p>

		<br>
		<hr>

		<h2>Constructor</h2>

		<h3>[name]( [param:LoadingManager manager] )</h3>
		<p>
		[page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:LoadingManager THREE.DefaultLoadingManager].
		</p>
		<p>
		Creates a new [name].
		</p>

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

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

		<h3>[method:null load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
		<p>
		[page:String url] — A string containing the path/URL of the <em>.drc</em> file.<br />
		[page:Function onLoad] — A function to be called after the loading is successfully completed.<br />
		[page:Function onProgress] — (optional) A function to be called while the loading is in progress. The argument will be the XMLHttpRequest instance, that contains .[page:Integer total] and .[page:Integer loaded] bytes.<br />
		[page:Function onError] — (optional) A function to be called if an error occurs during loading. The function receives error as an argument.<br />
		</p>
		<p>
		Begin loading from url and call the <em>onLoad</em> function with the decompressed geometry.
		</p>

		<h3>[method:this setDecoderPath]( [param:String value] )</h3>
		<p>
		[page:String value] — Path to folder containing the JS and WASM decoder libraries.
		</p>

		<h3>[method:this setDecoderConfig]( [param:Object config] )</h3>
		<p>
			[page:String config.type] - (Optional) <em>"js"</em> or <em>"wasm"</em>.<br />
		</p>
		<p>
		Provides configuration for the decoder libraries. Configuration cannot be changed
		after decoding begins.
		</p>

		<h3>[method:this setWorkerLimit]( [param:Number workerLimit] )</h3>
		<p>
			[page:Number workerLimit] - Maximum number of workers to be allocated. Default is 4.<br />
		</p>
		<p>
		Sets the maximum number of [link:https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers Web Workers]
		to be used during decoding. A lower limit may be preferable if workers are also for other tasks
		in the application.
		</p>

		<h3>[method:this preload]()</h3>
		<p>
		Requests the decoder libraries, if not already loaded.
		</p>

		<h3>[method:this dispose]()</h3>
		<p>
		Disposes of the decoder resources and deallocates memory. The decoder
		[link:https://github.com/google/draco/issues/349 cannot be reloaded afterward].
		</p>

		<h2>Source</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/DRACOLoader.js examples/js/loaders/DRACOLoader.js]
		</p>
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