I want to find the "real" position of an a-frame element. Not the one shown in the position
attribute. But the one that's the total of all the parents and relative to the world/scene position?
You can look up world coordinates in three.js: https://threejs.org/docs/#api/en/core/Object3D.getWorldPosition
It looks something like:
var worldPos = new THREE.Vector3();
worldPos.setFromMatrixPosition(el.object3D.matrixWorld);