How can i check when Lerp has finished?

Question

private bool hitted = false; private Vector3 hitPosition; private void Test() { RaycastHit hit; if (Physics.Raycast(start.position, Vector3.left, out hit, 1.5f) || Physics.Raycast(start.position, Vector3.right, out hit, 1.5f) || Physics.Raycast(start.position, Vector3.forward, out hit, 1.5f)) { if (hit.transform.tag == "Test") { hitted = true; hitPosition = hit.transform.localPosition; } } } private void Update() { if (hitted == true) { player.localRotation = Quaternion.Lerp(player.localRotation, Quaternion.LookRotation(hitPosition), 1 * Time.deltaTime); } }

What i want to detect is when the player finished rotating and then set back hitted to false.

The particular form of Lerp you've used here is an exponential ease-out - that means, mathematically, it never really "finishes" - it just gets closer and closer and closer to the target, slowing down as it goes. So, you can either test when the rotation has gotten "close enough," or switch to a form that completes the rotation in some fixed amount of time. What works better for your use case? — DMGregory
– DMGregory ♦, Commented Dec 3, 2017 at 0:25

DMGregory · Accepted Answer · 2019-03-02 13:48:23Z

You can check when your rotation has gotten "close enough" using a quaternion dot product, like so:

private void Update() { if (hitted == true) { Quaternion targetRotation = Quaternion.LookRotation(hitDirection); // Ensure we're correctly compensating for variable framerate float sharpness = 0.1f; float blend = 1f - Mathf.Pow(1f - sharpness, 30f * Time.deltaTime); player.localRotation = Quaternion.Lerp(player.localRotation, targetRotation, blend); // A Quaternion dot product gives you the cosine of the angle // between the rotations. Closer to 1 = more similar. if(Quaternion.Dot(transform.rotation, targetRotation) > 0.9999f) { // Now we're within 1 degree of the target rotation. // Put your "arrived" code here. } } }

Or, if you don't need to precisely control the exact threshold you want to use, Unity's default == operator on quaternions includes a little wiggle room, so in many cases you can even just test:

if (player.localRotatiin == targetRotation)

Yusuf · Accepted Answer · 2019-03-10 17:24:04Z

You can just use the t Time. Instead of writing 1 * Time.deltaTime just make 4 fields, LerpTime, CurrentLerpingTime, Speed, T;

Then check whether the T is more than or equal to 1, if it is then the lerp has finished!.

private float LerpTime = 1.0f; private float CurrentLerpingTime; private float Speed = 25f; private void Update(){ ...... if(hitted == true){ CurrentLerpingTime = Mathf.Clamp01(CurrentLerpingTime + (speed * Time.deltaTime)); t = CurrentLerpingTime / LerpTime; player.localRotation = Quaternion.Lerp(player.localRotation, Quaternion.LookRotation(hitPosition), t); if(t >= 1){ Debug.Log("Lerping Has Finished!"); } } }

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