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160 lines
5.3 KiB
160 lines
5.3 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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[page:Loader] →
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<h1>[name]</h1>
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<p class="desc">
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A loader for geometry compressed with the Draco library. <br /><br />
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[link:https://google.github.io/draco/ Draco] is an open source library for compressing and
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decompressing 3D meshes and point clouds. Compressed geometry can be significantly smaller,
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at the cost of additional decoding time on the client device.
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</p>
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<p>
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Standalone Draco files have a `.drc` extension, and contain vertex positions,
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normals, colors, and other attributes. Draco files *do not* contain materials,
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textures, animation, or node hierarchies – to use these features, embed Draco geometry
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inside of a glTF file. A normal glTF file can be converted to a Draco-compressed glTF file
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using [link:https://github.com/AnalyticalGraphicsInc/gltf-pipeline glTF-Pipeline]. When
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using Draco with glTF, an instance of DRACOLoader will be used internally by [page:GLTFLoader].
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</p>
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<p>
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It is recommended to create one DRACOLoader instance and reuse it to avoid loading and creating multiple
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decoder instances.
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</p>
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<h2>Code Example</h2>
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<code>
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// Instantiate a loader
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const loader = new DRACOLoader();
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// Specify path to a folder containing WASM/JS decoding libraries.
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loader.setDecoderPath( '/examples/js/libs/draco/' );
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// Optional: Pre-fetch Draco WASM/JS module.
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loader.preload();
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// Load a Draco geometry
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loader.load(
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// resource URL
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'model.drc',
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// called when the resource is loaded
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function ( geometry ) {
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const material = new THREE.MeshStandardMaterial( { color: 0x606060 } );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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},
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// called as loading progresses
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function ( xhr ) {
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console.log( ( xhr.loaded / xhr.total * 100 ) + '% loaded' );
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},
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// called when loading has errors
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function ( error ) {
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console.log( 'An error happened' );
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}
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);
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</code>
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<h2>Examples</h2>
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<p>
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[example:webgl_loader_draco]
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</p>
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<h2>Browser compatibility</h2>
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<p>DRACOLoader relies on ES6 [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise Promises],
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which are not supported in IE11. To use the loader in IE11, you must
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[link:https://github.com/stefanpenner/es6-promise include a polyfill]
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providing a Promise replacement. DRACOLoader will automatically use
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either the JS or the WASM decoding library, based on browser
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capabilities.</p>
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<br>
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<hr>
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<h2>Constructor</h2>
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<h3>[name]( [param:LoadingManager manager] )</h3>
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<p>
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[page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:LoadingManager THREE.DefaultLoadingManager].
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</p>
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<p>
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Creates a new [name].
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</p>
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<h2>Properties</h2>
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<p>See the base [page:Loader] class for common properties.</p>
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<h2>Methods</h2>
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<p>See the base [page:Loader] class for common methods.</p>
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<h3>[method:undefined load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
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<p>
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[page:String url] — A string containing the path/URL of the `.drc` file.<br />
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[page:Function onLoad] — A function to be called after the loading is successfully completed.<br />
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[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. If the server does not set the Content-Length header; .[page:Integer total] will be 0.<br />
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[page:Function onError] — (optional) A function to be called if an error occurs during loading. The function receives error as an argument.<br />
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</p>
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<p>
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Begin loading from url and call the `onLoad` function with the decompressed geometry.
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</p>
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<h3>[method:this setDecoderPath]( [param:String value] )</h3>
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<p>
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[page:String value] — Path to folder containing the JS and WASM decoder libraries.
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</p>
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<h3>[method:this setDecoderConfig]( [param:Object config] )</h3>
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<p>
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[page:String config.type] - (Optional) `"js"` or `"wasm"`.<br />
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</p>
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<p>
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Provides configuration for the decoder libraries. Configuration cannot be changed
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after decoding begins.
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</p>
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<h3>[method:this setWorkerLimit]( [param:Number workerLimit] )</h3>
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<p>
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[page:Number workerLimit] - Maximum number of workers to be allocated. Default is 4.<br />
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</p>
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<p>
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Sets the maximum number of [link:https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers Web Workers]
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to be used during decoding. A lower limit may be preferable if workers are also for other tasks
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in the application.
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</p>
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<h3>[method:this preload]()</h3>
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<p>
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Requests the decoder libraries, if not already loaded.
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</p>
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<h3>[method:this dispose]()</h3>
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<p>
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Disposes of the decoder resources and deallocates memory. The decoder
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[link:https://github.com/google/draco/issues/349 cannot be reloaded afterward].
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</p>
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<h2>Source</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/examples/jsm/loaders/DRACOLoader.js examples/jsm/loaders/DRACOLoader.js]
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</p>
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</body>
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</html>
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