collison problem(solved)

hi,
i am using the the contact callback for finding the collision i am giving a default material for my terrain and to the vehicle,
and my terrain contains roads and walls,my problem is when my vehicles chassis body (not wheels ) hits the terrain walls i need to know the collision from callback,but callbacks returns the collision always when my vehicle is on terrain even my wheels touches the ground not the chassis body ,please guide how can i solve this problem

hi walaber once look this post

You have to set your Callback for the wheels!

Zero

thx for the reply i solved the problem we neet to set the collison id for the chasis body of the vehicle from this we can check from callback whether it hits body or not