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how to use obj loader in three js

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by chandramouliprabuoff dot icon Updated: Jan 24, 2024

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3D modeling is the process of creating three-dimensional representations of objects or scenes using specialized software. This technology plays a crucial role in various industries, including gaming, animation, and architecture.

In gaming, 3D models bring characters and environments to life, enhancing the overall gaming experience. In animation, 3D models enable the creation of realistic and visually stunning visuals. For architecture, 3D modeling aids in the design and visualization of buildings and spaces, allowing architects to explore and refine their ideas before construction.

  • Three.js is a JavaScript library designed for creating 3D graphics directly within web browsers.
  • It simplifies 3D graphics development, making it accessible to web developers without requiring in-depth knowledge of low-level graphics programming.
  • Three.js provides a framework for building interactive 3D applications, allowing developers to create engaging and immersive user experiences.
  • Abstracts complex 3D concepts, such as shaders and rendering pipelines, provide a higher-level interface for developers.
  • It supports a wide range of features, including lighting, shading, and camera control, enhancing the visual quality and interactivity of 3D scenes.
  • Ensures cross-browser compatibility, enabling consistent 3D rendering across different web pages.
  • It has an active community of developers and comprehensive documentation, making it easier for developers to find support and resources.
  • Offers performance optimizations to ensure smooth rendering even in complex 3D scenes, making it suitable for a variety of applications.
  • Three.js is an open-source project, allowing developers to contribute, modify, and extend its functionality according to their specific needs.
  • It supports various rendering techniques, including WebGL, Canvas, and SVG, providing flexibility for different scenarios and devices.
  • Integrates seamlessly with external assets, such as 3D models and textures, allowing developers to enhance the visual richness of their applications.
  • Three.js supports cross-platform development, enabling the creation of 3D applications that work on desktops, tablets, and mobile devices.
  • Widely used in diverse industries, including gaming, animation, virtual reality, and architectural visualization, showcasing its versatility and applicability.

An OBJ (Wavefront .obj) file is a standard 3D model file format that stores geometry and material information. It is widely used in 3D graphics applications and is supported by many 3D modeling software. OBJ files can represent complex objects with vertices, cube, faces, normals, and texture coordinates. This format's simplicity and versatility make it a popular choice for exchanging 3D models between different software applications.

Three.js provides an OBJ Loader, a component that facilitates the loading and display of OBJ files in a web browser.

Some key features of the Three.js OBJ Loader include:

  • Efficient Loading: The loader efficiently parses OBJ files, handling extra work for both geometry and material information.
  • Texture Support: It supports textures, allowing the inclusion of detailed surface information in the 3D model.
  • Customization: Developers can customize the loading model, such as adjusting materials or applying transformations to the loaded object.

To integrate Three.js OBJ Loader into a web application, follow these steps:

  • Include Three.js Library: Add the Three.js library to your HTML file. You can either download it or include it on a content delivery network (CDN).
  • Include OBJ Loader: Add the OBJ Loader script to your HTML file after the Threejs library.
  • Create a Scene: Set up a Three.js scene, camera, and renderer as the foundation for your 3D environment.
  • Load and Display OBJ File.
  • Handle User Interaction (Optional): Implement user controls, such as mouse or touch interactions, to allow users to navigate the 3D scene.
  • Render the Scene.

 

Fig 1: Preview of the output that you will get on running this code from your IDE

Code

Three.js OBJLoader parse method not working

JavaScriptdotLines of Code : 57dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
var renderer = new THREE.WebGLRenderer();
renderer.setSize( window.innerWidth, window.innerHeight );
document.body.appendChild( renderer.domElement );

var scene = new THREE.Scene();

var camera = new THREE.PerspectiveCamera( 75, window.innerWidth/window.innerHeight, 0.1, 1000 );
camera.position.z = 5;

let loader = new THREE.OBJLoader();

// obj string below represents a cube
var objString = `
v 0.000000 2.000000 2.000000
v 0.000000 0.000000 2.000000
v 2.000000 0.000000 2.000000
v 2.000000 2.000000 2.000000
v 0.000000 2.000000 0.000000
v 0.000000 0.000000 0.000000
v 2.000000 0.000000 0.000000
v 2.000000 2.000000 0.000000
f 1 2 3 4
f 8 7 6 5
f 4 3 7 8
f 5 1 4 8
f 5 6 2 1
f 2 6 7 3
`;

var cube = loader.parse(objString);
scene.add( cube );

var hemiLight = new THREE.HemisphereLight( 0xffffff, 0x444444 );
hemiLight.position.set( 0, 20, 0 );
scene.add( hemiLight );

var dirLight = new THREE.DirectionalLight( 0xffffff );
dirLight.position.set( - 3, 10, - 10 );
scene.add( dirLight );


var animate = function () {
    requestAnimationFrame( animate );
    cube.rotation.x += 0.01;
    cube.rotation.y += 0.01;
    renderer.render( scene, camera );
};

animate();
body {
    margin: 0px;
}
canvas {
  display: block;
}
<script src="https://cdn.jsdelivr.net/npm/three@0.116.1/build/three.js"></script>
<script src="https://cdn.jsdelivr.net/npm/three@0.116.1/examples/js/loaders/OBJLoader.js"></script>

Instruction

  1. Install Visual Studio Code IDE on your computer.
  2. Create a new HTML file.
  3. Copy the code using the 'Copy' button and create an HTML tag then paste the code inside the tag into that HTML file.
  4. Create a script tag inside the body tag Then keep the function lines inside the script tag(refer to preview as well).
  5. ⁠Add the script tag from line 1 to 40.
  6. Add the style tag for CSS function.
  7. Save and run the HTML file directly from the file location to generate the output.


I found this code snippet by searching for 'how to use obj loader in three js' .you can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.75.1.


Using this solution, we are able to process form using angular js with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to use obj loader in three js to follow object.

FAQ

1. What is an object property in the context of three js obj loader? 

 In the context of Three.js OBJ Loader, object properties are attributes associated with the loaded 3D object. These attributes include geometry and materials. They allow developers to manipulate the object's appearance and behavior. 


 2. How does the var objLoader function contribute to loading OBJ models in three js? 

 var objLoader is an instance of the Three.js OBJLoader class. It streamlines the loading of OBJ models. It provides methods to fetch, parse, and create Three.js 3D objects from the loaded data. 


3. What are loaders and how do they assist with loading 3D objects on a web page?  

In Three.js, loaders manage the asynchronous loading of external resources, such as 3D models. They help fetch and process 3D objects without blocking the main thread. This ensures smooth integration into web pages. 


 4. How can we integrate script src tags into our source code for efficient use of three js obj loader? 

 Include the Three.js library with. Also, include the OBJLoader script with. This ensures access to necessary scripts for efficient use. 


 5. How can non-faculty staff jobs enjoy understanding and utilizing three js obj loader?  

  • Non-faculty staff can use Three.js OBJ Loader. They can use it to create compelling presentations or marketing materials. 
  • Those in product development enjoy visualizing prototypes. They also enjoy collaborating in the design process. 
  • Staff involved in training can use Three.js OBJ Loader for interactive 3D simulations. This improves training materials. 
  •  Non-technical staff can enhance websites with engaging visuals. They can use Three.js OBJ Loader for engaging web content. 
  • Event organizers can enhance event experiences by using Three.js OBJ Loader. It creates interactive 3D displays. 

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