Drag game object with finger

I have gameobject in the screen and i want to move the gameobject with finger. I tried to apply Mesh Collider but it’s not working,

GameObject modalClone = Instantiate( modal ) as GameObject; //clone the model 
modalClone.transform.localScale += new Vector3(250,250,250);
modalClone.transform.localPosition = new Vector3(0,0,0);

You can simply get the touch using Input.GetTouch(0) and use Camera.main.ScreenToWorldPoint with the touch coordinates as x and y input and z input can be whatever you want. The vector3 that is returned becomes the object’s world position. If you want to drag a rigidbody with forces, check out the DragRigidbody script in the Standard Assets.