Tracks Hi, I need you to help

[blackarmy360]

Hi, I need you to help me because I have a problem.
I finished the modeling and exporting but when I put the map in the game it goes through the ground. help me please ^^

 

[Stereo]

Sounds like your objects don't have collisions - did you use the correct names for surfaces? ie. every object starting with a number and material type.