Simple & crude velocity measure:

You can sample the world position on this frame and store the result from the previous frame. You now have two points of reference. Take into consideration how long the time slice was between the two points to derive the velocity. I think the code would be:

var velocity = (current - previous) / Time.deltaTime;

If the leap (current - previous) was big, say 5 units to the right and the time slice was small (1/60), we would be going very fast. 5/(1/60) = 300 units per second.

Hi I was working on the same thing as this recently, and I managed to get something that works for me, even if the velocity hits zero. I only set this up to work on the Y axis but should be easy easy enough to calculate the other axis too.

var camPos : Transform;

Update () {

StartCoroutine(curVelocity(0.1));

}

function curVelocity(waitTime : float)

{

     var previous : float;
     var current : float;
     var velocity : float;
     previous = camPos.position.y;
     yield WaitForSeconds (waitTime);
     current = camPos.position.y;
     velocity = current - previous;
     if (velocity == 0)
     {
    velocity = 0.000001;
     }
     velocity = velocity / waitTime;
     if (velocity < 0.0001 && velocity > -0.0001)
     {
    velocity = 0;
     }


     print (velocity);

}