What is the best way to incorporate vibrant hues into a .obj model using Three.js?

While working on a WebGL scene using Three.js, I encountered an issue. I am attempting to load a .obj model with Three.js and apply a blue color to it instead of using a mtl texture. Here is the approach I tried:

// instantiate a loader
var loader = new THREE.OBJLoader();

// load a resource
loader.load(
    // resource URL
    'model_path.obj',
    // Function when resource is loaded
    function ( object ) {
        scene.add( object );
    }
);

However, I received the following error message:

WebGL: INVALID_VALUE: bufferData: no data
Uncaught TypeError: Cannot read property 'length' of undefined
[.CommandBufferContext]GL ERROR :GL_INVALID_VALUE : glVertexAttribPointer: size GL_INVALID_VALUE

I am seeking advice on how to resolve this error and successfully load an obj model with a blue color applied. Your assistance is greatly appreciated!

Answer №1

It appears that the error is due to missing vertex points in the file. An OBJ file is a basic raw file format containing:

v :::: vertex

vt :::: texture coordinate

vn :::: normal

usemtl ::: defines the texture, ka (ambient), ks (specular) and kd (diffused)

Try importing your obj into Blender and exporting it with triangulated faces enabled, similar to this: https://i.sstatic.net/VdHPp.png

If you don't do this, the indices will appear in face4 format like:

0/1/2/3 3/2/4/0 .... and so on After triangulation, they will appear as:

0/1/2 3/2/0 ...

Therefore, once you correct your *.obj file, you can load it into a parser and assign materials to the objects.

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