+ A loader for geometry compressed with the Draco library.
+ [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.
+
+ Standalone Draco files have a .drc extension, and contain vertex positions, + normals, colors, and other attributes. Draco files do not 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]. +
+ +
+ // Instantiate a loader
+ var loader = new THREE.DRACOLoader();
+
+ // Specify path to a folder containing WASM/JS decoding libraries.
+ THREE.DRACOLoader.setDecoderPath( '/examples/js/libs/draco' );
+
+ // Optional: Pre-fetch Draco WASM/JS module.
+ THREE.DRACOLoader.getDecoderModule();
+
+ // 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' );
+
+ }
+ );
+
+
+ [example:webgl_loader_draco]
+
+ 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.
+ ++ [page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:LoadingManager THREE.DefaultLoadingManager]. +
++ Creates a new [name]. +
+ ++ [page:String value] — Path to folder containing the JS and WASM decoder libraries. +
+ +
+ [page:String config.type] - (Optional) "js" or "wasm".
+
+ Provides configuration for the decoder libraries. Configuration cannot be changed + after loading the decoders. +
+ ++ Requests the decoder libraries, if not already loaded. +
+ ++ Disposes of the decoder library and deallocates memory. The decoder + [link:https://github.com/google/draco/issues/349 cannot be reloaded afterward]. +
+ +
+ [page:String url] — A string containing the path/URL of the .drc file.
+ [page:Function onLoad] — A function to be called after the loading is successfully completed.
+ [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.
+ [page:Function onError] — (optional) A function to be called if an error occurs during loading. The function receives error as an argument.
+
+ Begin loading from url and call the onLoad function with the decompressed geometry. +
+ ++ [page:String path] — Base path. +
++ Set the base path for the .drc file. +
+ +