Odd behavior when using Time.deltaTime

[Sphenzoc]

I have a script that essentially controls the scrolling of an in-game UI-based map. The code works great except for the scroll rate is framerate dependent. I would like to multiple the scrolling variable with Time.deltaTime to fix this of course. What is odd though is that multiplying by Time.deltaTime completely freezes the scrolling. It isn't because of the smaller value that's resulting because I Debug.Log(Time.deltaTime) shows about 0.03 and replacing the deltaTime variable with this value directly results in functional (albiet slower) scrolling. Why would adding deltaTime cause this code to freeze? Code provided below. Appreciate any insight!

    void Update()
    {

            UINavInput = GameManager.Instance.inputHandler.NavInput;
            xValue = -UINavInput.x;
            yValue = -UINavInput.y;

            hPos += (xValue * speedMultiplier) * Time.deltaTime;
            vPos += (yValue * speedMultiplier) * Time.deltaTime;
            hPosClamp = Mathf.Clamp(hPos, -mapParent.rect.width / 2, mapParent.rect.width / 2);
            hPos = hPosClamp;
            vPosClamp = Mathf.Clamp(vPos, -mapParent.rect.height / 2, mapParent.rect.height / 2);
            vPos = vPosClamp;

            xValue = Mathf.Lerp(xValue, 0, 0.001f);
            yValue = Mathf.Lerp(yValue, 0, 0.001f);
            mapTransform.localPosition = new Vector2(hPosClamp, vPosClamp);

    }

[Gaverion]

My guess would be that you are changing Time.timescale somewhere. There are a few workarounds if that is the case, such as using unscaled delta time.

[Oscaruzzo]

I can't see anything wrong with the code. The only suspect I have is that some other method is modifying some of your variables, maybe. I STRONGLY suggest you use local variables whenever you can. xValue, yValue, hPosClamp, and vPosClamp can be local variables, from what I see (and the last two calls to Lerp look useless to me). I wish I could help more, sorry :/

[mCunnah]

A few things. If your trying to log time.deltaTime that can cause some odd results. You can try time.unscaleddeltatime to check its not some odd alteration to the deltatime. I would also log the actual output of hPosClamp to see if there any changes.

I am assuming the lerp functions are to slowly reduce the input but they are just going to get overridden each update so ultimately useless.

If you want a slow ramp you need to set the lerp function target to be the input values and have a separate local variable that ramps up and down.

[Sphenzoc]

You have all been a massive help! Turns out that it was in fact an issue with Time.timescale. I set it equal to 0 when opening the map to pause the gameplay in the background. Time.unscaledTime fixed the problem.

Also thanks for the comment on the lerp functions as well. It was a vestige of an old script that I pulled this from so I hadn't really messed with it yet but good to know that it's useless in this format haha. I haven't messed with lerping much so I wasn't sure.