What is the standard method for importing a gltf model in threejs?

Question

What is the standard method for importing a gltf model in threejs?

Looking to develop a versatile advanced viewer in three.js that can generate Gltf files. How can I gather detailed information about each component of the model?

I've explored the loader class with loader.load() from THREE.GLTFLOADER, and discovered the information (in scene.children which represent the models' components) but struggling to make it generic.

Are there any libraries or functions available that would provide access to individual components? Something similar to .getElementById, perhaps .GetAllComponents or .GetMaterialsTextures (where I can retrieve paths for textures and model components).

I'm not asking for a direct answer as I want to learn on my own.

var dracoLoader = new THREE.DRACOLoader();
dracoLoader.setDecoderPath( 'js/draco_decoder.js' );

let loader = new THREE.GLTFLoader(); // I've seen this used in tutorials, but how does it work - does it help with data compression or just encoding?
loader.setDRACOLoader( dracoLoader );

loader.load('assets/BM1294_EOS_TABLE_220X280_OUVERT/BM1294.gltf',
function(gltf){
    console.log(gltf);
    let mesh = gltf.scene.children[0]; // referring to one of the models
    renderer.gammaOutput = true;
    renderer.gammaFactor = 2.2;
    scene.add(mesh);
});

Appreciate any assistance provided :)

javascript import three.js model gltf

Answer 1

Answer №1

To make changes to basic JSON data without involving threejs objects, it is recommended to first load the JSON separately from GLTFLoader. Here is an example:

// Fetch and load JSON using the native fetch() API.
fetch('model.gltf')
  .then((response) => response.json())
  .then((json) => {
    // View and edit the glTF JSON content.
    console.log(json);
    json.materials[0].baseColorFactor = [1, 0, 0, 1];

    // Convert the modified glTF JSON back to a string for parsing with THREE.GLTFLoader.
    const jsonString = JSON.stringify(json);
    const loader = new THREE.GLTFLoader();
    loader.parse( jsonString, '', ( gltf ) => {
      // Incorporate the result into the scene.
      scene.add(gltf.scene);
    });
  });

NOTE: This approach assumes usage of the .gltf file extension. Files with the .glb extension are in binary format, which requires a different parsing method. Conversion between these two formats can be done easily using glTF-Pipeline.

For more intricate modifications to the glTF content, familiarity with the format specification is necessary, as it goes beyond the usual scope of a Stack Overflow query. It may be simpler to load threejs objects with GLTFLoader in the customary way and then make adjustments to those instead.

Answer 2

To make changes to basic JSON data without involving threejs objects, it is recommended to first load the JSON separately from GLTFLoader. Here is an example:

// Fetch and load JSON using the native fetch() API.
fetch('model.gltf')
  .then((response) => response.json())
  .then((json) => {
    // View and edit the glTF JSON content.
    console.log(json);
    json.materials[0].baseColorFactor = [1, 0, 0, 1];

    // Convert the modified glTF JSON back to a string for parsing with THREE.GLTFLoader.
    const jsonString = JSON.stringify(json);
    const loader = new THREE.GLTFLoader();
    loader.parse( jsonString, '', ( gltf ) => {
      // Incorporate the result into the scene.
      scene.add(gltf.scene);
    });
  });

NOTE: This approach assumes usage of the .gltf file extension. Files with the .glb extension are in binary format, which requires a different parsing method. Conversion between these two formats can be done easily using glTF-Pipeline.

For more intricate modifications to the glTF content, familiarity with the format specification is necessary, as it goes beyond the usual scope of a Stack Overflow query. It may be simpler to load threejs objects with GLTFLoader in the customary way and then make adjustments to those instead.

What is the standard method for importing a gltf model in threejs?

Answer №1

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