This is me, my team and collaborators have been working on recently. World transforming AR specifically the floor.
You can see occlusions, such as the pillars occluding the floor effect, but we have more sophisticated occlusion handling too:
You can’t tell from this video that the occlusion handling is dynamic, so if the postbox managed to move, the occlusions would stay up to date. And here’s a gallery of nice shots
If you have Snapchat and want to try it for yourself, here are the snapcodes: