Another use case solution.
Dynamic real time Reflection in rear/side view mirror while driving Car in VR.
I have been searching for a solution quite some time, so that I can show real time environment reflection in car mirror while driving car in VR. By default the mirror reflective material will show the reflection of sky sphere. If you want to have the environmental surrounding reflection then you can place reflection spheres at certain intervals on your driving path and build reflection capture. When the car goes through these reflection captures then the mirror reflects the reflection capture.
Though it is not completely real time and perfect it might be useful for certain use case after some tweaking. For me it did the job.
!Happy designing guys!