A guide on extracting vertices from an imported obj file using Three.js

Currently, I'm in the process of uploading a range of .obj and .mtl files for a volume rendering tool that was created using WebGL and Three.js. Within a section of my code, I am utilizing OBJMTLLoader to handle the file uploads:

 scapula = new THREE.OBJMTLLoader();
 scapula.load( 'obj/scapulaTWO.obj', 'obj/scapulaTWO.mtl', 
    function ( object ) {
                object.name = "scapula";
                object.scale.set (4,4,4);
                vertices = object.geometry.vertices;
                scene.add(object);
    });

Despite my efforts, I've encountered an issue where I'm unable to access the vertices. The debugger indicates that object.geometry is undefined. I also attempted:

    vertices = new THREE.Mesh(object);

without success. Any assistance with this matter would be greatly appreciated.

Thank you in advance.

javascriptthree.js

Answer №1

The organization of nodes in the three.js imported 3d model is determined by the structure of the OBJ file and the grouping elements such as o or g. You can explore how three.js constructs your model using a browser debugger. In my scenario, with multiple objects declared in the OBJ file, the node structure appears like this:

model (THREE.Group) > children (Array) > child [i] (THREE.Object3D) > children (Array) > child [j] (THREE.Mesh) > geometry (THREE.Geometry) > vertices (Array)

To access vertex k of Mesh j in object3d i, you can use the following code snippet:

var vertexK = object.children[i].children[j].geometry.vertices[k];

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