Im fighting now with textures and I cant put textures to the sidewalls as you can see here:

I understood that in the .tex like this:
4 0 0 1.0 1.0 grass
4 0 1 1.0 1.0 grass
4 0 2 1.0 1.0 grass
4 0 4 1.0 1.0 grass
4 0 5 1.0 1.0 grass
The 3rd number from left to right means wich side of the wall have the texture named "grass".
Its works with number 2 that it seems to be the top of the wall.
But not with sides (1) ; start of the wall (4) and end of the wall (5).
Any hint?
Thanks.
