Hello guys
I have been learning 3d programing for the past couple of days and i was just wondering how do i save a 3D map?

For example in a 2D game you just write a 2d array of number to text file, each number corresponds to a specific tile.

How do I that in a 3d game?
For example if I have couple of 3d house models or some other models how do i store their position in a 3d world?

Ok I have another question about maps, and I thought why create new topic.
Anyways, right now I have a 3d camera and I can move around my 3d world. Its just a simple room and a hallway. The thing is, I create this world just by writing the vertices and it took me some time to do it.
This is my game map.

52 vertices
-3.0 0.0 -3.0
-1.5 0.0 -3.0
0.0 0.0 -3.0
1.5 0.0 -3.0
3.0 0.0 -3.0
-3.0 0.0 -1.5
-1.5 0.0 -1.5
0.0 0.0 -1.5
1.5 0.0 -1.5
3.0 0.0 -3.0
-3.0 0.0 0.0
-1.5 0.0 0.0
0.0 0.0 0.0
1.5 0.0 0.0
3.0 0.0 0.0
-3.0 0.0 1.5
-1.5 0.0 1.5
0.0 0.0 1.5
1.5 0.0 1.5
3.0 0.0 1.5
-3.0 0.0 3.0
-1.5 0.0 3.0
0.0 0.0 3.0
1.5 0.0 3.0
3.0 0.0 3.0
-3.0 1.0 -3.0
-1.5 1.0 -3.0
0.0 1.5 -3.0
1.5 1.5 -3.0
3.0 1.5 -3.0
-3.0 1.0 -1.5
-1.5 1.0 -1.5
0.0 1.5 -1.5
1.5 1.5 -1.5
3.0 1.5 -1.5
-3.0 1.0 0.0
-1.5 1.0 0.0
0.0 1.5 0.0
1.5 1.5 0.0
3.0 1.5 0.0
-3.0 1.0 1.5
-1.5 1.0 1.5
0.0 1.0 1.5
1.5 1.0 1.5
3.0 1.0 1.5
-3.0 1.0 3.0
-1.5 1.0 3.0
0.0 1.0 3.0
1.5 1.0 3.0
0.0 1.5 1.5
1.5 1.5 1.5
3.0 1.5 1.5


My question is, how can I create a single simple room without the need of writing every vertices myself?
Now all these vertices were hand written and it took some time to do them, what if I have a big world with 3 or 5 rooms, how can I build these rooms?
Do I use software like blender 3d or 3dmax to create a room and load it into my game?

And how do companies build their maps? How do they build the rooms and hallways etc... ?