Using GLTFLoader in Node.js with Three.js

To load a GLB model in a Node.js environment with Three.js, you need to properly initialize the GLTFLoader and handle the asynchronous loading process. Here's how you can modify your code to load and add a GLB model to your scene:

JAVASCRIPTCopied
// glb model: t1.glb  
// three r145  type:module
import * as THREE from 'three'
import { GLTFLoader } from 'three/examples/jsm/loaders/GLTFLoader.js'
import fs from 'fs' // Node.js file system module

const scene = new THREE.Scene();

// Add your box mesh
var geometry = new THREE.BoxGeometry(100, 100, 100); 
var material = new THREE.MeshLambertMaterial({
    color: 0x0000ff
}); 
var mesh = new THREE.Mesh(geometry, material);
scene.add(mesh); 

// Load GLB model
const loader = new GLTFLoader();

// Option 1: If you're using Node.js, you need to load the file from the filesystem
const filePath = './path/to/t1.glb';
const data = fs.readFileSync(filePath);
const buffer = Buffer.from(data);

// Parse the loaded buffer
loader.parse(buffer.buffer, '', (gltf) => {
    // The model is loaded, add it to the scene
    scene.add(gltf.scene);
    console.log('Model loaded successfully');
    
    // If you need to extract data from the model
    gltf.scene.traverse((child) => {
        if (child.isMesh) {
            console.log('Found mesh:', child.name);
            // Access geometry, materials, etc.
        }
    });
}, (error) => {
    console.error('Error loading model:', error);
});

// Option 2: If you're using a URL (less common in Node.js but possible with additional modules)
// loader.load(
//     'path/to/t1.glb',
//     (gltf) => {
//         scene.add(gltf.scene);
//         console.log('Model loaded successfully');
//     },
//     (xhr) => {
//         console.log((xhr.loaded / xhr.total * 100) + '% loaded');
//     },
//     (error) => {
//         console.error('Error loading model:', error);
//     }
// );

Important Notes for Node.js Environment:

1. In Node.js, you need to use the file system (fs) module to read the GLB file and then use the parse() method instead of the load() method.

2. Make sure your file path is correct relative to where your script is running.

3. If you're using a headless environment (no browser), you might need additional packages like three-stdlib or a headless WebGL implementation like gl or node-canvas-webgl.

4. Remember that gltf.scene is the actual 3D object that you need to add to your scene, not the entire gltf object.

5. The GLB model might need to be positioned or scaled appropriately to be visible in your scene.

This approach should help you successfully load and add a GLB model to your Three.js scene in a Node.js environment.