Swipe individual gameobject in a scene

Hello ! I've a scene in which I need to swipe on individual gameobjects. I think I'll have to use raycast function for this. But I'm really new to coding. Can someone help ?

My present swipe code for up/down swipe(detects swipe on the whole screen)

var finid:int=-1;

var uptest:boolean=true;

var downtest:boolean=true;

var StartPos:Vector2;

var dis:float=20.0;

var top : GameObject;

var front : GameObject;

function Update ()

{

for(var touch:Touch in Input.touches)

{

var pos = touch.position;

         if (touch.phase == TouchPhase.Began && finid == -1)
         {
             finid = touch.fingerId;
             StartPos = pos;
             
         }
         else if (touch.fingerId == finid)
         {
             var delta = pos - StartPos;
             if (touch.phase == TouchPhase.Moved && delta.magnitude > dis)
             {
                 finid = -1;
                 if (Mathf.Abs(delta.x) > Mathf.Abs(delta.y))
                 {
                 //
                 }
                 else
                 {
                     if (uptest && delta.y > 0)
                     {
                     Debug.Log("up");
                     top.SetActive(true);
                      
                     }
                        
                     else if (downtest && delta.y < 0)
                         {
                         front.SetActive(true);
                   
                         }
                 }
                
             }
             else if (touch.phase == TouchPhase.Canceled || touch.phase == TouchPhase.Ended)
                 finid = -1;
         }
     }

}