How do I create separate colliders on an object?

[asfdasc]

I am currently creating a side scrolling game where a player can jump if its contact with the ground. In the code I simply have a variable in which holds a boolean value of whether or not the box collider on the character in colliding with the ground. But the issue with this is the character can simply climb up the sides of walls because it still is technically colliding with the ground. I had an idea of having a separate collider on the object where is would be only on the bottom so that i would be able to find whether or not the bottom of the collider was touching the floor but there can only be one collider on an object at a time. I was wondering how i should approach this issue because i am clueless as to how to go about this.

[Spinnernicholas]

The simple way is to add a child GameObject and attach the collider to that. Then you just have to wire the two objects together in code.

The more complex way is to check the Normal Vector coming from the colliding object.
Here is a simple script to do that.

GameObject groundedOn = null;
bool isGrounded = false;
 
function Update(){
  if(isGrounded)
  {
    //do something
  }
}
 
function OnCollisionEnter(theCollision : Collision){
  if(theCollision.gameObject.rigidBody.isKinematic) //Only want kinematic rigidbodies
  {
    foreach(ContactPoint2D contact in theCollision.contacts)
    {
      if(contact.normal.y > someThreshold)
      {
        isGrounded = true;
        groundedOn = theCollision.gameObject;
        break;
      }
    }
  }
}
 
function OnCollisionExit(theCollision : Collision){
  if(theCollision.gameObject == groundedOn)
  {
    groundedOn = null;
    isGrounded = false;
  }
}