RandInt ?!

[Amnesiaplayer]

I am trying to create some "big landscapes" where you usually play on, so I am not gonna use planes this time.
but yeah, I made a big big Landscape, I'm really happy that I made something like this,
I did a little paint on it, like red lava rock kinda things, some "path" etc, I painted it with around 5 images.
Now the real problem.
Exporting issue, I export it as a .obj
and then rescale it etc, but then, I have to apply new textures to it.
and that is not possible, since that thing is 1 mesh object, and I used around 5 images.
Is there a way to create a "Uv" kinda map from all the paint layers you painted on the object?!
I have a friend, who's a really good animator, and sculptor, but he didn't know aobut this export thing either.

Btw, is there a possibility, to automatic, create a body to the object you make, in maya?
I mean.. you know how difficult it would be for me, If I had to add body, to my landscape? xD I'm sure I have to use around 8 million bodies then lol jk.


Btw, A little side question, how does RandInt work?!
what I actually want is 3 objects, what all the 3 objects spawns on like.. .5 diffirent locations.
I searched up in the engine scripts, but I really didn't understand anything