Hi the problem im having is that when my airplane is firing rockets, the rockets cant collide with anything in the world i have created, they just go through the walls. This is the script i have on the rockets. The rockets are rigidbodys.
var explode: Transform;
function OnCollisionEnter(collision : Collision)
{
Instantiate(explode,transform.position, transform.rotation);
Destroy(gameObject);
}
Try setting up some rigid body physics for the building's as well, which would also keep the character from walking through them as well.
If you're firing a rocket, it may be that the rocket is traveling too fast to hit the building. So if it's going at a couple hundred feet per second, the frame where it would collide with the building is not ever actually hitting. If that is the case, try using a Raycast to detect collision.