WebCAD/src/Add-on/loadfbx.ts

import { Command } from "../Editor/CommandMachine";
import { FileSystem } from "../Common/FileSystem";
import { app } from '../ApplicationServices/Application';
import { LoadingManager, FBXLoader } from "three";

export class Fbx implements Command
{
    async exec()
    {
        let files = await FileSystem.ChooseFile(".fbx");

        for (let i = 0; i < files.length; i++)
        {
            let f = files.item(i);
            var reader = new FileReader();

            // Closure to capture the file information.
            reader.onload = (ev) =>
            {
                console.log(ev);
                let manager = new LoadingManager();
                let loader = new FBXLoader(manager);
                let obj = loader.parse(reader.result as string, "");

                obj.scale.set(0.01, 0.01, 0.01);
                obj.matrixWorldNeedsUpdate = true;

                app.Viewer.Scene.add(obj);
            }
            // Read in the image file as a data URL.
            reader.readAsArrayBuffer(f);
        }
    }
}