threepipe/src/plugins/import/STLLoadPlugin.ts

import {ILoader, Importer} from '../../assetmanager'
import {STLLoader} from 'three/examples/jsm/loaders/STLLoader.js'
import {BufferGeometry, Color, Mesh} from 'three'
import {AnyOptions} from 'ts-browser-helpers'
import {PhysicalMaterial} from '../../core'
import {BaseImporterPlugin} from '../base/BaseImporterPlugin'

/**
 * Adds support for loading `.stl`, `model/stl` files and data uris.
 * @category Plugins
 */
export class STLLoadPlugin extends BaseImporterPlugin {
    public static readonly PluginType = 'STLLoadPlugin'
    protected _importer = new Importer(class extends STLLoader implements ILoader {
        transform(res: BufferGeometry, _: AnyOptions): Mesh|undefined {
            if (!res.attributes?.normal) res.computeVertexNormals()
            // todo set mesh name from options/path
            return res ? new Mesh(res, new PhysicalMaterial({
                color: new Color(1, 1, 1),
                vertexColors: res.hasAttribute('color'),
            })) : undefined
        }
    }, ['stl'], ['model/stl', 'model/x.stl-binary', 'model/x.stl-ascii'], false)

}