Setting target framerate changes animation speed in editor, while Time.deltaTime stays the same

Question

I have few animations that work similar to this:

IEnumerator MoveObjTo(GameObject obj1, GameObject ob2, float time)
{
    var start = obj1.transform.position.x;
    var end = obj2.transform.position.x;

    float passedPath = 0f;
    var s = end - start;
    float speed = (end - start) / time;
    while (passedPath < s)
    {
        var ds = speed * Time.deltaTime;
        var newPos = obj.transform.position;
        newPos.x += ds;
        obj.transform.position = newPos;
        passedPath += ds;
        yield return new WaitForEndOfFrame();
    }
}

It worked fine until I added this line to my code:

Application.targetFrameRate = 60;

After this, inside the Unity editor animation started to work 10 times faster (it's still OK on device). And I noticed that if I set targetFrameRate to the same FPS value as shown in the editor's Stats (400 FPS), to the animation speed is fixed.

If I print Time.deltaTime and ds inside this method, I'll get about the same values and it looks like Time.timeDelta is always 0.017, but with different targetFrameRate values that same 0.017 corresponds to different real time intervals.

I'll fix it by ifdefing the targetFrameRate setup, I'm just curious how this works.

Answer 1

Some things you can check:

1. Make sure you aren't changing Time.timeScale anywhere.
2. Make sure you aren't setting Time.captureDeltaTime or Time.captureFramerate anywhere.
3. See if you can update the Unity Editor to a newer version, in case it's a bug in the Editor.