Need assistance as require function is not functioning as anticipated

const THREE = require('three');
require('three/examples/js/loaders/OBJLoader.js');

Once I imported threejs from node_modules, I decided to utilize the provided OBJLoader, but encountered an unexpected error.

THREE is not defined
    at eval (eval at <anonymous> (experiment.js:133), <anonymous>:5:1)

Within the OBJLoader:

THREE.OBJLoader = function ( manager )

The error indicates that Three inside the OBJLoader is not defined even though it was required previously. How should I handle requiring files in this manner?

javascriptthree.jsrequire

Answer №1

Utilizing three.js and its code examples can be a bit complex when working with browserify and similar tools due to their reliance on the global variable THREE.

In my browserify projects, I typically create a file named three-loader.js with the following content:

const THREE = require('three');

// Make 'THREE' available globally for example files
window.THREE = THREE;

// Load necessary components from the examples
require('three/examples/js/loaders/OBJLoader.js');

module.exports = THREE;

Throughout the project, I then replace instances of require('three') with 

const THREE = require('./three-loader');
.

Alternatively, you can copy the example files into your project directory and add const THREE = require('three'); at the top of each file.

Answer №2

The file 

three/examples/js/loaders/OBJLoader.js
does not have a module.exports, so it is not meant to be required in the usual Node.js way. However, you can still require the file as you are currently doing, but keep in mind that it will try to execute the code within that specific file context where the variable THREE is not defined. This file was specifically designed to be loaded in a browser environment where the global variable THREE is defined.

If you want to use Three.js on the client-side, you should include it in your HTML using a script tag:

<script src="js/three.min.js"></script>

This will create the necessary global variable THREE in your browser environment. After including Three.js, you can then load the OBJLoader.js example by adding another script tag:

<script src="js/OBJLoader.js"></script>

Answer №3

When encountering this issue, it is likely due to attempting to load a node module that has not been properly installed. Additionally, missing dependencies related to the module could also result in failure. To resolve this, consider visiting npm and running npm install three, followed by require it in with var three = require('three');.

For more information on npm, visit: https://www.npmjs.com/package/three

In case of the error stated, it indicates the module cannot be found at all. This suggests there may be an issue with the path provided or other dependencies. Typically, running NPM install should rectify any issues. After installation, you can utilize the method on the required object using standard dot notation.

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