Angular.io（SystemJS）三个未定义ReferenceError：三个未定义

Question

I started to use three.js in angular.io and have this error:

(index):18 Error: (SystemJS) THREE is not defined
ReferenceError: THREE is not defined
    at Object.eval (http://localhost:3000/node_modules/three/examples/js/controls/OrbitControls.js:16:1)
    at eval (http://localhost:3000/node_modules/three/examples/js/controls/OrbitControls.js:1044:4)
    at eval (http://localhost:3000/node_modules/three/examples/js/controls/OrbitControls.js:1045:3)
    at eval (<anonymous>)
Evaluating http://localhost:3000/node_modules/three/examples/js/controls/OrbitControls.js
Evaluating http://localhost:3000/app/three-basis/three-camera-orbit-control.component.js

My imports and component:

import {Component} from '@angular/core';
import {CameraProvider} from './camera-provider.service';
import 'threejs/controls/OrbitControls';
import {OrbitControls} from 'three';

@Component({selector: 'three-camera-orbit-control', template: ''})
export class ThreeCameraOrbitControlComponent {

    constructor(private cameraProvider: CameraProvider) {
        let camera = this.cameraProvider.getCamera();
        let controls = new OrbitControls(camera);
        controls.addEventListener('change', () => {});
    }

}

If I add this var THREE = require("three"); in OrbitControls.js in my node_modules/three, error gones and all is ok. I'm not good in js yet, can please some one help me, how to do it wright way? Thanks.

Answer 1

See working example of using Angular + Three.js including OrbitControls and ColladaLoader: https://github.com/makimenko/angular-three-examples

Currently, Three.js examples are not included into a module and use them in Angular typescript code could be a little bit tricky. One of solution/workaround could be:

Firstly, include dependencies:

three
@types/three

Secondly, import in component:

import * as THREE from 'three';
import "./js/EnableThreeExamples";
import "three/examples/js/controls/OrbitControls";
import "three/examples/js/loaders/ColladaLoader";

Then use it in code:

this.controls = new THREE.OrbitControls(this.camera);
this.controls.rotateSpeed = 1.0;
this.controls.zoomSpeed = 1.2;
this.controls.addEventListener('change', this.render);

Hope this could help you to start