@inweb/viewer-three/src/Viewer/loaders/index.ts

JavaScript library for rendering CAD and BIM files in a browser using Three.js

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// This software and its documentation and related materials are owned by
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//
//   This application incorporates Open Design Alliance software pursuant to a
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import { ILoadersRegistry, loadersRegistry } from "@inweb/viewer-core";

import { GLTFFileLoader } from "./GLTFFileLoader";
import { GLTFCloudDynamicLoader } from "./GLTFCloudDynamicLoader";

/**
 * Viewer loaders registry. Use this registry to register custom loaders.
 *
 * To implement custom loader:
 *
 * 1. Define a loader class implements {@link ILoader}.
 * 2. Define a constructor with a `viewer` parameter.
 * 3. Override {@link ILoader.isSupport} and сheck if the loader can load the specified file.
 * 4. Override {@link ILoader.load} and define the logic for loading the scene from the file.
 *
 *    The loader should do:
 *
 *    - Load raw data from file and convert it to the `Three.js` scene.
 *    - Add scene to the viewer `scene`.
 *    - Create `ModelImpl` for the scene and to the viewer `models` list.
 *    - Synchronize viewer options and overlay.
 *    - Update the viewer.
 *
 *    The loader must emit events:
 *
 *    - `geometryprogress` - during loading. If progress is not supported, emit it once with a value of 100%
 *         after the load is complete.
 *    - `databasechunk` - when scene is loaded and ready to render.
 * 5. Override {@link ILoader.dispose} and release loader resources, if required.
 * 6. Register loader provider in the loaders registry by calling the {@link loaders.registerLoader}.
 *
 * @example Implementing a custom loader.
 *
 * ```javascript
 * import { loaders, Loader, ModelImpl, Viewer } from "@inweb/viewer-three";
 *
 * class MyLoader extends Loader {
 *   public viewer: Viewer;
 *
 *   constructor(viewer: Viewer) {
 *     super();
 *     this.viewer = viewer;
 *   }
 *
 *   override isSupport(file, format): Boolean {
 *     // place custom logic here
 *     return ...;
 *   }
 *
 *   override load(file, format, params): Promise<this> {
 *
 *     // place custom loading logic here
 *     const scene = ...;
 *
 *     const modelImpl = new ModelImpl(scene);
 *     modelImpl.loader = this;
 *     modelImpl.viewer = this.viewer;
 *
 *     this.viewer.scene.add(scene);
 *     this.viewer.models.push(modelImpl);
 *
 *     this.viewer.syncOptions();
 *     this.viewer.syncOverlay();
 *     this.viewer.update();
 *
 *     this.viewer.emitEvent({ type: "databasechunk", data: scene, file });
 *
 *     return Promise.resove(this);
 *   };
 * }
 *
 * loaders.registerLoader("MyLoader", (viewer) => new MyLoader(viewer));
 * ```
 */
export const loaders: ILoadersRegistry = loadersRegistry("threejs");

// build-in loaders

loaders.registerLoader("gltf-file", (viewer: any) => new GLTFFileLoader(viewer));
loaders.registerLoader("gltf-cloud", (viewer: any) => new GLTFCloudDynamicLoader(viewer));