20 != 20 怎么能返回真 [英] How can 20 != 20 return true

问题描述

所以，我试图在统一中做一些事情，我写了这样的东西

So, I was trying to do some stuff in unity and i wrote something like this

private IEnumerator RotateToNormal()
    {
        while (hingePoint.eulerAngles.z > 20)
        {
            float d = Time.deltaTime * 500;
            hingePoint.eulerAngles = new Vector3(hingePoint.eulerAngles.x, 0, Mathf.Clamp(hingePoint.eulerAngles.z - d, 20, 90));
            transform.position = hingePoint.position + hingePoint.rotation * new Vector3(camDist, lift, 0);
            transform.LookAt(hingePoint);
            Debug.Log(hingePoint.eulerAngles.z);
            yield return null;
        }
        inSelection = false;
    }

如您所见，它应该从 while() 循环中退出，作为变量等于 20 并达到 20(Debug.Log 和调试器显示，hingePoint.eulerAngles.z = 20)
但是，当它等于 20 时，它不会退出 while() 循环我试图更改运算符(到！=)，类型，我在循环中尝试了一些 if 语句，显然它不起作用.有趣的是几乎相同的代码块工作得很好

As you can see, it should bail out from while() loop as variable equal to 20 and it reaches 20(Debug.Log and debugger shows that in hingePoint.eulerAngles.z = 20)
However, when it becomes equal to 20 it does not quit while() loop I was trying to change operators(to !=), types, I tried some if statements in loop, and apparently it didn't work. Interesting that almost same code block works just fine

private IEnumerator RotateToTop()
    {
        inSelection = true;
        while (hingePoint.eulerAngles.z < 90)
        {
            float d = Time.deltaTime * 500;
            hingePoint.eulerAngles = new Vector3(hingePoint.eulerAngles.x, 0, Mathf.Clamp(hingePoint.eulerAngles.z + d, 0, 90));
            transform.position = hingePoint.position + hingePoint.rotation * new Vector3(camDist, lift, 0);
            transform.LookAt(hingePoint);
            yield return null;
        }
    }

所以，由于某种原因，我认为程序认为变量在等于 20 时不等于 20，问题是:怎么可能?

So, as I figured for some reason program thinks that variable is not equal to 20 when it is equal to 20, and there's the question: How can that be?

推荐答案

使用 Mathf.Approximately 当比较浮点数并且您希望它们等于或接近等于某个其他值时:

Use Mathf.Approximately when comparing floats and you expect them to be equal or nearly equal to some other value:

private IEnumerator RotateToNormal()
{
    while (!Mathf.Approximately(hingePoint.eulerAngles.z, 20.0f))
    {
        float d = Time.deltaTime * 500;
        hingePoint.eulerAngles = new Vector3(hingePoint.eulerAngles.x, 0, 
                Mathf.Clamp(hingePoint.eulerAngles.z - d, 20, 90));
        transform.position = hingePoint.position + hingePoint.rotation 
                * new Vector3(camDist, lift, 0);
        transform.LookAt(hingePoint);
        Debug.Log(hingePoint.eulerAngles.z);
        yield return null;
    }
    inSelection = false;
}

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