Well...after making some research..it seems the high grass is clearly tied to the aerial satellite imagery that is on the sim.
I did a small aerial imagery airport change from Bing to Google Maps using @Augustin Winther guide, and it changed completely.
Then i edited my Orthos and paint it with some brown to get a "rocky" terrain , so you could after that make your custom grass (3d grass) as you want and it worked perfectly.
It seems A.I takes green as a base on how taller the grass should be.
Before:
After:
I did a small aerial imagery airport change from Bing to Google Maps using @Augustin Winther guide, and it changed completely.
Then i edited my Orthos and paint it with some brown to get a "rocky" terrain , so you could after that make your custom grass (3d grass) as you want and it worked perfectly.
It seems A.I takes green as a base on how taller the grass should be.
Before:
After:
Last edited:



