need help to get the next mouse position when holding and dragging mouse

[Deviros3D]

I got current mouse position with code :

if (Input.GetMouseButton(0)){
var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
var hit : RaycastHit;
if(Physics.Raycast(ray,hit)){
print ("Current Mouse Position : " + hit.point);
}
}

Now i want to get the next mouse position when dragging :
Who can help me, please?

[Gibbonator]

Is your code in Update? You will need to wait until Update gets called in the next frame for Input.mousePosition to have a new value.
You could add a member variable to keep track of the previous mouse position.