As for the virtual reality, it creates a kind of simulated environment. It is not like in the case with the augmented reality architectural app. You see the other environment, which differs from the one in front of you. It might be either an artificial reality or an actual place, the image of which is added in a VR app. Here, you can move around, look and go in any direction, while AR architectural apps do not provide such an opportunity. Besides, to use VR software, you need to have special tools, so-called VR viewers (for instance, Oculus Rift). As for the augmented reality for architecture, you need just your gadget and a special application installed.