Calculating the frame-rate in a Unity scene

Question

I'm making a project with Augmented Reality, using Unity and Vuforia extensions. I'm new to C#, but I was looking for a method similar to ARToolKit's getFrame(), and I'm really not finding anything.

My questions are:

1. Is it necessary that I can calculate the frame-rate that my scene is operating at?
2. Which scene object should i use to track the frame-rate?

Answer 1

Thats as simple as:

public float avgFrameRate;

public void Update()
{
    avgFrameRate = Time.frameCount / Time.time;
}

Put this code in any MonoBehaviour and attatch it to any GameObject in the scene hierarchy.

Please note: this will only give you an average frame-rate. For a more current frame-rate, other answers have addressed effective ways of accomplishing that.

Answer 2

None of the answers here consider the fact that the timescale can be modified in Unity and if it is, all the above approaches will be incorrect. This is because Time.Delta time is influenced by the timescale.

As such, you need to use Time.unscaledDeltaTime:

int fps = 0;
void Update () {
    fps = (int)(1f / Time.unscaledDeltaTime);
}