随着时间的推移在两个值之间变小 [英] Lerp between two values over time

问题描述

我正在尝试将浮点数减少一个时间值，我正在使用Unity并停止时间Time.timeScale = 0f;，所以不能使用Time.deltaTime，所以在while循环中使用了'Time.realtimeSinceStartup'，我在玩家可以在游戏中设置的全局脚本中的主音量变量，介于0-1之间，所以说我读0.6，我想在2秒内将音量降低到0，我如何获得百分比以保持音量减小?

I'm trying to reduce a float by a time value, i'm using Unity and stopping time Time.timeScale = 0f; so can not use Time.deltaTime so using 'Time.realtimeSinceStartup' in a while loop, i read in the master volume variable from a global script that the player can set in game between 0 - 1 so say i read in 0.6 and i want to lower the volume to 0 in 2 second how do i get the percentage to keep reducing the volume by ?

这是我的代码..

 private IEnumerator VolumeDown ()
{
    float volumeIncrease = globalVarsScript.musicVolume;
    float volumePercentage = ??;
    float newLerpEndTime = Time.realtimeSinceStartup + 2f;

    while (Time.realtimeSinceStartup < newLerpEndTime)
    {
        audio.volume = volumeIncrease;
        volumeIncrease -= volumePercentage;
        yield return null;
    }
}

对不起，我无法获得'volumePercentage'

Sorry i just can't get the 'volumePercentage'

谢谢.

推荐答案

我正在使用Unity，并且停止时间为Time.timeScale = 0f;，所以不能使用 Time.deltaTime，因此在while循环中使用"Time.realtimeSinceStartup".

I'm using Unity and stopping time Time.timeScale = 0f; so can not use Time.deltaTime so using 'Time.realtimeSinceStartup' in a while loop.

您无需为此使用Time.realtimeSinceStartup.的确，将Time.timeScale设置为 0 会使 Time.deltaTime 每帧返回 0 .

You don't need to use Time.realtimeSinceStartup for this. It is true that setting Time.timeScale to 0 makes Time.deltaTime to return 0 every frame.

这就是为什么在 Unity 4.5中添加了 Time.unscaledDeltaTime 的原因来解决这个问题.只需将Time.deltaTime替换为Time.unscaledDeltaTime.您可以使用if (Time.timeScale == 0)事件来自动决定是使用Time.unscaledDeltaTime还是Time.deltaTime.

This is why Time.unscaledDeltaTime was added in Unity 4.5 to address that. Simply replace the Time.deltaTime with Time.unscaledDeltaTime. You can event use if (Time.timeScale == 0) to automatically decide whether to use Time.unscaledDeltaTime or Time.deltaTime.

IEnumerator changeValueOverTime(float fromVal, float toVal, float duration)
{
    float counter = 0f;

    while (counter < duration)
    {
        if (Time.timeScale == 0)
            counter += Time.unscaledDeltaTime;
        else
            counter += Time.deltaTime;

        float val = Mathf.Lerp(fromVal, toVal, counter / duration);
        Debug.Log("Val: " + val);
        yield return null;
    }
}

用法:

StartCoroutine(changeValueOverTime(5, 1, 3));

该值在3秒内从5更改为1. Time.timeScale设置为1还是0都没关系.

The value changes from 5 to 1 within 3 seconds. It doesn't matter if Time.timeScale is set to 1 or 0.

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