Upadating mesh material of OBJ model

Questions
1

I have to load a model in OBJ format and then to change the material of each mesh.

My code look like this:

    var house = BABYLON.SceneLoader.ImportMesh("", "./model/", "Untitled.obj", scene, function(meshes){
    
    scene.createDefaultCameraOrLight(true, true, true);
    scene.createDefaultEnvironment();

   // Meshes to be changed//
    var Wall_1 = meshes[0];
    var Flor_2 = meshes[1];
    var Wall_2 = meshes[2];
    var Roof_down = meshes[3];
    var Roof_up = meshes[4];
    var Flor_1 = meshes[5];
    var Terase = meshes[6];
   //------------------------------//

   //Code that doesn't work correctly//
    var newMaterial = new BABYLON.StandardMaterial("newMaterial", scene);
    newMaterial.diffuseTexture = new BABYLON.Texture('model/2266_model/ROOF_Wood_1.jpg', scene);
    Roof_up.material = newMaterial;
    console.log(Roof_up.material);
    console.log(Wall_1.material);
   //-------------------------------//

});

It is working but the texture is not displayed as expected

image
This is the output

image
But it should look in this way

What can I do to make it work correctly?

3

I am pretty sure the UVs of the OBJ are not correct so texturing would not work here and probably always pick the texel at 0,0.

This might be much easier to validate with a repro in the playground.