generate objects(like trees), with position ramdom
on another object(like a terrain)
I can not place the objects manually if the world is big and much trees and for some reason make the 3d view slower( think is the alpha).
And i have a question:
imagine a big world, bge can support thousands polygons, but not for thousands of objects, with a generator or placing the objects manually, much objects individual, make the game slower, how many would be needed to lower the fps?
How to place objects randomly over a large terrain:
Use blenders inbuilt particle system to place them (disable gravity though), and then make all the instances real. (pro tip: Use vertex colors to define the density of places objects)
If you have lots of trees/placed objects, you may want to have some sort of LOD system
