Error: The variable "model" has not been declared

As a JavaScript newbie, I might be making some cringe-worthy mistakes in my code. My goal is to import a model using the Three.js GTLF Loader and define it as 'model' so that I can set it to automatically rotate.

My use of terminology may not be accurate, but this is the best way I can describe what I am attempting to do and where I need help.

I will share my whole code, but the error seems to be in this section:

var model;
var modelLoader = new GLTFLoader().setPath('models/DamagedHelmet/');
modelLoader.load('DamagedHelmet.gltf', function (gltf) {

    model = gltf.scene;
    gltf.scene.traverse(function (child) {

        if (child.isMesh) {

            roughnessMipmapper.generateMipmaps(child.material);

        }

    });

    scene.add(model);

    roughnessMipmapper.dispose();

    render();

});

I have defined the object as model with the intention of having it continuously rotate automatically. I attempted to achieve this a few lines below in the following code snippet:

function render() {

    renderer.render(scene, camera);

    model.rotation.x += 0.01;
    model.rotation.y += 0.005;

}

There might be something obvious that I'm missing or doing incorrectly. The solutions I found online seem to work only when JavaScript is not imported via a module (or so I believe).

Appreciate any guidance you guys have.

Answer №1

Dealing with GLTF can be a bit challenging, especially depending on whether you're using node or a local script. To ensure compatibility in node, you need to include the following:

import { GLTFLoader } from '../../node_modules/three/examples/jsm/loaders/GLTFLoader.js';

This will allow you to add GLTFLoader to your project.

After setting this up, be mindful of the CORS policy to prevent any issues. In Express, you can achieve this by:

app.get('/', (req, res, next) =>{
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "X-Requested-With");
next()
  });

You can find more information about CORS here.

Lastly, make sure that all the files referenced in DamagedHelmet are accessible and compliant with the CORS policy. Only then should you proceed with executing your code, which appears correct based on my understanding.

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