Tips for maintaining the reference of a Three.js object after importing it as an .obj file

If you want to learn how to incorporate a .obj file into your scene, the official documentation provides a helpful example that can be found here.

const loader = new OBJLoader();

// Load the resource
loader.load(
    // Resource URL
    'models/monster.obj',
    // Called when the resource is loaded
    function ( object ) {

        scene.add( object );

    },
    // Called during the loading process
    function ( xhr ) {

        console.log( ( xhr.loaded / xhr.total * 100 ) + '% Loaded' );

    },
    // Called if there are errors during loading
    function ( error ) {

        console.log( 'An error occurred' );

    }
);

However, once the object is loaded, it might not be clear how to manipulate it. The URL is used to load the object, and then the loaded object is passed as an argument to the onload function within the loader.load method. But what is the most effective way to keep track of and reference this object?

Answer №1

To simplify this process, remember to establish a reference before initializing the loading function.

const loader = new OBJLoader();

//Declare a variable for object reference
var loadedObject;

//Execute the model loading with appropriate references
loader.load('models/monster.obj', function ( loadedObject ) {
    scene.add( loadedObject );
},
function ( xhr ) {
    console.log( ( xhr.loaded / xhr.total * 100 ) + '% loaded' );
},
function ( error ) {
    console.log( 'An error occurred' );
});

//Upon completion of loading, manipulate the loaded model
loadedObject.rotation.set(x, y, z);
loadedObject.position.set(x, y, z);

Answer №2

Managing it in a somewhat unconventional way, but surprisingly effective.

I've considered simply attaching it to the current window or document:

function ( item ) {
    scene.add( item ); 
    window.obj = item; // attaching it to the window
}

However, this approach strikes me as unusual since it links it to the global space. What if I prefer a more contained scope?

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