Any way to get a bounding box from a three.js Object3D?

Question

I\'m loading an OBJ file using Three.js and OBJLoader.js. This returns a Three.Object3D object, which has what you\'d expect from a 3D model (position vector, up vector...)

Answer 1

If you want the bounding box position and size as the object appears in the scene, try the BoundingBoxHelper:

var helper = new THREE.BoundingBoxHelper(someObject3D, 0xff0000);
helper.update();
// If you want a visible bounding box
scene.add(helper);
// If you just want the numbers
console.log(helper.box.min);
console.log(helper.box.max);

The .boundingBox on the geometry doesn't account for translations, rotations, or scaling that may be applied to the parent mesh and etc. and I found it very difficult to adjust for that manually, but the helper does it for you.