The first one is the DreamWalker. This allows users to recreate an environment in virtual reality and walk as if a user were present in it. But the important thing is that the program could adapt the desired place (virtual) to the streets where the player lives, since the software would choose the ones that best fit the real one in order for the user to navigate safely.
This would also be achieved with the help of sensors, which would detect the obstacles discovered in reality and that the user could not see, but would be represented in the virtual world and thus avoid them.
Another one is the Mise-Unseen project, which has great potential to provide more interactive virtual reality experiences, since its technology could alter what the user sees on the screen to such an extent that he does not realize. (Only items outside the fovea change!)
See the full story here: https://segmentnext.com/2019/10/29/microsoft-research-presents-significant-advances-in-virtual-reality/