I'm trying to figure out how to make "wind" force a character to a direction. I mainly want it so that if the player jumps over a canyon, the wind will guide him to the other side. I set something like this by doing this:

I set a trigger box and made it so that when the player collides with the box, it make the variable "inWind" to true in the player's ThirdPersonController script and this is the code I added to the ThirdPersonController's ApplyGravity function:

if (inWind)
    {
    moveDirection = constantForce.force = Vector3.forward * -1.5;
    //constantForce.relativeForce = Vector3.up * -1.5;
        //moveDirection = Vector3.forward * -1.5;
    verticalSpeed = 0.0;
    gravity = 0;
    }

However, the player is able to "move" against the wind. I don't want to make the player unable to move at all, because I still want the player to still be able to glide themselves. Any suggestions?

Here is the code attached to the windzone.

function OnTriggerEnter (hit : Collider) 
{
 if (hit.transform.tag == "Player") 
   { 
    var controller : ThirdPersonController = hit.GetComponent(ThirdPersonController);
    Debug.Log("enter");
    hit.gameObject.GetComponent(ThirdPersonController).inWind = true; 
    //controller.isTalking = true;
    //controller.animation.Play("swim");
    }
}


function OnTriggerExit (hit : Collider) 
{ 
    var controller : ThirdPersonController= hit.GetComponent(ThirdPersonController); 
    if (controller.IsGrounded !=null) 
    hit.gameObject.GetComponent(ThirdPersonController).inWind = false; 
    //controller.animation.Stop("swim"); 
    controller.gravity = controller.defaultGravity; //20.0
    //controller.isTalking = false;
    Debug.Log("Left the water"); 
} 

UPDATE Here is the current windzone code. The windDirection variable shows up in the inspector and I am using the X and Z variable as the wind direction.

var windDirection = Vector3.zero;

function OnTriggerEnter (hit : Collider) 
{
 if (hit.transform.tag == "Player") 
   { 
    var controller : ThirdPersonController = hit.GetComponent(ThirdPersonController);
    Debug.Log("enter");
    hit.gameObject.GetComponent(ThirdPersonController).inWind = true; 
    //controller.isTalking = true;
    //controller.animation.Play("swim");
    }
}

function OnTriggerExit (hit : Collider) 
{ 
    var controller : ThirdPersonController= hit.GetComponent(ThirdPersonController); 
    if (controller.IsGrounded !=null) 
    controller.inWind = false; 
    //controller.animation.Stop("swim"); 
    controller.gravity = controller.defaultGravity; //20.0
    //controller.isTalking = false;
    Debug.Log("Left the water"); 
} 


function Update()
{
     var controller : ThirdPersonController= GetComponent(ThirdPersonController); 

    if (controller.moveDirection != windDirection && controller.inWind)
    {
            controller.moveDirection = windDirection;
    }
}