I am facing a challenge with a .obj file that appears colored in software like MeshLab or Microsoft's 3D builder. However, there is no .mtl file linked to it. When I try to open it in ThreeJs using the most basic method, it shows up as grey.
var loader = new THREE.OBJLoader(manager);
loader.load('assets/model.obj', (object) => {
this.scene.add( object );
},);
Color data is not directly supported in OBJ format unless accompanied by an MTL file.
Despite this limitation, certain applications can interpret RGB data in the v line as vertex colors, even though it is an unsupported method.
To confirm that your OBJ file is utilizing this approach to impart color, you should look for the following format:
v x y z[w] r g b
If your file is indeed using this method for color, you may find some assistance here: https://github.com/Sean-Bradley/objVertexColors
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