Is there a standard way to create a photo studio-like background (e.g.,
https://i.ebayimg.com/images/g/KxwAAOSwzvlW-6Kv/s-l1600.jpg)
It is the combination of two planes as an object shadow drops on them depending
on the distance.
I tried to make one by merging two perpendicular planes (to eliminate the
horizon line), but wasn't successful.
