Three.js OBJLoader without adding object to scene - three.js

Question

I created a function for loading obj files in Three.js. Instead of adding the object directly to the scene in that function, I want to return it to the upper function.
Current code:
var loadObjFile = function(modelConfiguration) {
var mtlLoader = new THREE.MTLLoader();
mtlLoader.load(modelConfiguration.mtl, function (materials) {
materials.preload();
var objLoader = new THREE.OBJLoader();
objLoader.setMaterials(materials);
objLoader.load(modelConfiguration.obj, function (object3d) {
object3d.name = modelConfiguration.name;
scene.add(object3d);
});
});
};
Things I tried
Rewritting the function in difference ways. But couldn't get it to return the object3d. Example:
var loadObjFile = function(modelConfiguration) {
var mtlLoader = new THREE.MTLLoader();
var obj;
mtlLoader.load(modelConfiguration.mtl, function (materials) {
materials.preload();
var objLoader = new THREE.OBJLoader();
objLoader.setMaterials(materials);
objLoader.load(modelConfiguration.obj, function (object3d) {
object3d.name = modelConfiguration.name;
obj = object3d;
});
});
return obj;
};
Instead of adding the object3d to the scene, I added it to a dummy group and returned this group. It worked but later on I have a lot of unnecessary groups. I also tried to extract the object from the group with group.children[0] and group.getObjectByName(modelConfiguration.name) but it didn't work either. Example:
var loadObjFile = function(modelConfiguration) {
var mtlLoader = new THREE.MTLLoader();
var group;
mtlLoader.load(modelConfiguration.mtl, function (materials) {
materials.preload();
var objLoader = new THREE.OBJLoader();
objLoader.setMaterials(materials);
objLoader.load(modelConfiguration.obj, function (object3d) {
object3d.name = modelConfiguration.name;
group.add(object3d);
});
});
return group; // works, but unneccessary group
//return group.children[0]; // error: undefined object
//return group.getObjectByName(modelConfiguration.name); // error: undefined object
};
Thank you in advance!

Answer 1

use a lambda:
var loadObjFile = function(modelConfiguration, onObj) {
var mtlLoader = new THREE.MTLLoader();
var obj;
mtlLoader.load(modelConfiguration.mtl, function (materials) {
materials.preload();
var objLoader = new THREE.OBJLoader();
objLoader.setMaterials(materials);
objLoader.load(modelConfiguration.obj, function (object3d) {
object3d.name = modelConfiguration.name;
obj = object3d;
onObj(obj);
});
});
};
use:
loadObjFile(myModelConfig, function(obj){
console.log(obj);
})