@ **DanielBennifer; HaxO; and **
Thanks for reply 
In fact; I’m an architect… wishing to use UE4 for my Arch / visulization…
To get a photorealistic result… There are 2 issues I have to take care of:
01- The Landscape surrounding my buidings…
02- The light system…
So; I’ll start with HaxO’s advice
Thanks again
and
Best wishes