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221 lines
8.8 KiB
221 lines
8.8 KiB
3 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"> A loader for `LDraw` resources. <br /><br />
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[link:https://ldraw.org LDraw] (LEGO Draw) is an
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[link:https://ldraw.org/article/218.html open format specification] for describing LEGO
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and other construction set 3D models.</p>
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<p>An LDraw asset (a text file usually with extension .ldr, .dat or .txt) can describe
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just a single construction piece, or an entire model.
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In the case of a model the LDraw file can reference other LDraw files, which are loaded
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from a library path set with [page:Function setPartsLibraryPath]. You usually download
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the LDraw official parts library, extract to a folder and point setPartsLibraryPath to it.
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</p>
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<p>Library parts will be loaded by trial and error in subfolders 'parts', 'p' and 'models'.
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These file accesses are not optimal for web environment, so a script tool has been made
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to pack an LDraw file with all its dependencies into a single file, which loads much faster.
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See section 'Packing LDraw models'. The LDrawLoader example loads several packed files.
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The official parts library is not included due to its large size.</p>
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<h2>Extensions</h2>
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<p>
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LDrawLoader supports the following extensions:
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</p>
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<ul>
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<li>!COLOUR: Color and surface finish declarations.</li>
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<li>BFC: Back Face Culling specification.</li>
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<li>!CATEGORY: Model/part category declarations.</li>
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<li>!KEYWORDS: Model/part keywords declarations.</li>
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</ul>
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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 LDrawLoader();
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// Optionally set library parts path
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// loader.setPartsLibraryPath( path to library );
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// Load a LDraw resource
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loader.load(
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// resource URL
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'models/car.ldr_Packed.mpd',
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// called when the resource is loaded
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function ( group ) {
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// Optionally, use LDrawUtils.mergeObject() from
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// 'examples/jsm/utils/LDrawUtils.js' to merge all
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// geometries by material (it gives better runtime
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// performance, but building steps are lost)
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// group = LDrawUtils.mergeObject( group );
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scene.add( group );
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},
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// called while loading is progressing
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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_ldraw]
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</p>
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<h2>Packing LDraw models</h2>
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<p>To pack a model with all its referenced files, download the
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[link:https://www.ldraw.org/parts/latest-parts.html Official LDraw parts library]
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and use the following Node script:
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[link:https://github.com/mrdoob/three.js/blob/master/utils/packLDrawModel.js utils/packLDrawModel.js]
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It contains instructions on how to setup the files and execute it.</p>
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<h2>Metadata in .userData</h2>
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<p>LDrawLoader returns a [page:Group] object which contains an object hierarchy. Depending of each subobject
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type, its .userData member will contain the following members: <br />
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In a [page:Group], the userData member will contain: <br />
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<ul>
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<li>.numBuildingSteps: Only in the root [page:Group], Indicates total number of building steps in
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the model. These can be used to set visibility of objects to show different building steps, which is
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done in the example.</li>
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<li>.buildingStep: Indicates the building index of this step.</li>
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<li>.category: Contains, if not null, the [page:String] category for this piece or model.</li>
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<li>.keywords: Contains, if not null, an array of [page:String] keywords for this piece or model.</li>
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</ul>
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</p>
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<p>In a [page:Material], the userData member will contain:
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<ul>
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<li>.code: Indicates the LDraw code for this material.</li>
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<li>.edgeMaterial: Only in a [page:Mesh] material, indicates the [page:LineBasicMaterial] belonging to edges
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of the same color code (in the LDraw format, each surface material is also related to an edge material)</li>
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<li>.conditionalEdgeMaterial: Only in a [page:LineSegments] material, indicates the [page:Material] belonging
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to conditional edges of the same color code.</li>
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</ul>
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</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 LDraw file.<br />
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[page:Function onLoad] — A function to be called after the loading is successfully completed. The function receives the loaded JSON response returned from [page:Function parse].<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 callback function with the parsed response content.
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</p>
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<h3>[method:this setPartsLibraryPath]( [param:String path] )</h3>
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<p>
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[page:String path] — Path to library parts files to load referenced parts from. This is different from [page:Loader.setPath], which indicates the path to load the main asset from.<br />
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</p>
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<p>
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This method must be called prior to [page:.load] unless the model to load does not reference library parts (usually it will be a model with all its parts packed in a single file)
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</p>
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<h3>[method:this setFileMap]( [param:Map fileMap] )</h3>
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<p>
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[page:Map map] — Set a map from [page:String] to [page:String] which maps referenced library filenames to new filenames. If a fileMap is not specified (the default), library parts will be accessed by trial and error in subfolders 'parts', 'p' and 'models'.
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</p>
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<h3>[method:undefined parse]( [param:String text], [param:String path], [param:Function onLoad], [param:Function onError] )</h3>
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<p>
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[page:String text] — LDraw asset to parse, as string.<br />
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[page:String path] — The base path from which to find other referenced LDraw asset files.<br />
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[page:Function onLoad] — A function to be called when parse completes.<br />
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</p>
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<p>
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Parse a LDraw file contents as a String and fire [page:Function onLoad] callback when complete. The argument to [page:Function onLoad] will be an [page:Group] that contains hierarchy of [page:Group], [page:Mesh] and [page:LineSegments] (with other part data in .userData fields).
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</p>
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<h3>[method:Material getMaterial]( [param:String colourCode] )</h3>
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<p>
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[page:String colourCode] — Color code to get the associated [page:Material].
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</p>
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<h3>[method:String getMainMaterial]()</h3>
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<p>
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Returns the [page:Material] for the main LDraw color.
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</p>
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<p>For an already loaded LDraw asset, returns the [page:Material] associated with the main color code.
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This method can be useful to modify the main material of a model or part that exposes it.
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</p>
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<p>
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The main color code is the standard way to color an LDraw part. It is '16' for triangles and '24' for edges. Usually
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a complete model will not expose the main color (that is, no part uses the code '16' at the top level, because they
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are assigned other specific colors) An LDraw part file on the other hand will expose the code '16' to be colored, and
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can have additional fixed colors.
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</p>
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<h3>[method:String getMainEdgeMaterial]()</h3>
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<p>
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Returns the [page:Material] for the edges main LDraw color.
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</p>
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<h3>[method:void preloadMaterials]( [param:String path] )</h3>
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<p>
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[page:String path] — Path of the LDraw materials asset.
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</p>
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<p>This async method preloads materials from a single LDraw file. In the official parts library there is a special
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file which is loaded always the first (LDConfig.ldr) and contains all the standard color codes. This method is
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intended to be used with not packed files, for example in an editor where materials are preloaded and parts are
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loaded on demand.</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/LDrawLoader.js examples/jsm/loaders/LDrawLoader.js]
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</p>
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</body>
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</html>
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