simply iam having one car model and try to move this using c# scripts.
that code contain gets input from keyboard and move the car…its contains transform.rotate and transform.translate functions only…but my car model penetrating into the terrain(mountain).i,e whenever the camera Z angle gets negative value the car penetrate into the terrain…could anyone help me to stop the penetration and give me the suggestion for car moving in ups and downs…Thank u
I’ll give a shot at answering this question, but if I get it wrong, please add images of your scene and add your code, which would give us better insight of the situation.
One thing you should know is that doing a transform.translate sets the position in smooth lerps. However it can ignore the collision too.
First of all, for collisions you’ll need a rigidbody on the Car object. Once you have a rigidbody, try using rigidbody.AddForce(); to move the car about, there are plenty of tutorials on this, so you should be fine 
So maybe that’s enough to solve your problem.
But if it isn’t, please add some scene images and code so we can give more accurate answers
Best of luck! 