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how to load 3d model in three js

Release time:2023-06-26 06:35:53 Page View: author:Yuxuan
Three.js is a popular JavaScript library that enables developers to create and display 3D graphics on the web. One of the key features of Three.js is its ability to load 3D models created in other software programs. In this article, we will discuss the steps required to load 3D models in Three.js.

Preparing the 3D Model

Before we can load a 3D model in Three.js, we need to prepare the model itself. The most common format for 3D models is the .obj file format, which can be exported from most 3D modeling software programs. Once we have our 3D model in the .obj file format, we need to make sure that it includes all of the necessary textures and materials.

Loading the 3D Model in Three.js

Once we have our 3D model prepared, we can begin the process of loading it into Three.js. The first step is to create a new instance of the THREE.OBJLoader object. This object will be responsible for parsing the .obj file and creating a Three.js mesh object that we can use to render the 3D model.

var loader = new THREE.OBJLoader();

The next step is to load the .obj file using the load() method on our loader object. This method takes two parameters: the path to the .obj file, and a callback function that will be called once the file has finished loading.

loader.load('path/to/model.obj', function (object) {// Callback function});

Inside the callback function, we can access the mesh object that was created by the OBJLoader object. We can then add this mesh object to the Three.js scene using the add() method.

scene.add(object);

Loading Textures and Materials

If our 3D model includes textures and materials, we will need to load them separately and apply them to the mesh object. We can do this using the THREE.TextureLoader and THREE.MTLLoader objects.The TextureLoader object is responsible for loading image files that will be used as textures in our 3D model. We can create a new instance of this object and pass in the path to the texture file.

var textureLoader = new THREE.TextureLoader();var texture = textureLoader.load('path/to/texture.jpg');

We can then apply this texture to the mesh object by setting its material property to a new instance of the THREE.MeshPhongMaterial object.

var material = new THREE.MeshPhongMaterial({map: texture});var object = new THREE.Mesh(geometry, material);

The MTLLoader object is responsible for loading material files that define the materials used in our 3D model. We can create a new instance of this object and pass in the path to the material file.

var materialLoader = new THREE.MTLLoader();materialLoader.load('path/to/materials.mtl', function (materials) {// Callback function});

Inside the callback function, we can access the materials object that was created by the MTLLoader object. We can then apply these materials to the mesh object by setting its material property to a new instance of the THREE.MeshFaceMaterial object.

var meshMaterial = new THREE.MeshFaceMaterial(materials.materials);var object = new THREE.Mesh(geometry, meshMaterial);

Conclusion

Loading 3D models in Three.js is a powerful feature that allows developers to create impressive 3D graphics on the web. By following the steps outlined in this article, we can easily load 3D models and their associated textures and materials in Three.js. With a little creativity and some coding skills, the possibilities for 3D graphics on the web are endless.
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