随着时间的推移缩放游戏对象

Question

我制作了一个统一的测试游戏，所以当我点击一个按钮时，它会生成一个从工厂类创建的圆柱体。我正在努力做到这一点，所以当我创建圆柱体时，它的高度会在接下来的 20 秒内缩小。我发现的一些方法很难转化为我正在做的事情。如果您能引导我走向正确的方向，我将不胜感激。

这是我的圆柱体类代码

 public class Cylinder : Shape
{
    public Cylinder()
    {
    GameObject cylinder = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
        cylinder.transform.position = new Vector3(3, 0, 0);
        cylinder.transform.localScale = new Vector3(1.0f, Random.Range(1, 2)-1*Time.deltaTime, 1.0f);

        cylinder.GetComponent<MeshRenderer>().material.color = Random.ColorHSV();
        Destroy(cylinder, 30.0f);
    }
}

Answer 1

这可以通过协程函数中的Time.deltaTime 和Vector3.Lerp 来完成。类似于Rotate GameObject over time 和Move GameObject over time 问题。稍微修改一下就可以做到这一点。

bool isScaling = false;

IEnumerator scaleOverTime(Transform objectToScale, Vector3 toScale, float duration)
{
    //Make sure there is only one instance of this function running
    if (isScaling)
    {
        yield break; ///exit if this is still running
    }
    isScaling = true;

    float counter = 0;

    //Get the current scale of the object to be moved
    Vector3 startScaleSize = objectToScale.localScale;

    while (counter < duration)
    {
        counter += Time.deltaTime;
        objectToScale.localScale = Vector3.Lerp(startScaleSize, toScale, counter / duration);
        yield return null;
    }

    isScaling = false;
}

用法：

将在 20 秒内缩放 GameObject：

StartCoroutine(scaleOverTime(cylinder.transform, new Vector3(0, 0, 90), 20f));

Answer 2

查看Lerp。如何使用它的一般示例如下所示：

float t = 0;
Update()
{
    t += Time.deltaTime;
    cylinder.localScale = new Vector3(1, Mathf.Lerp(2f, 1f, t/3f), 1); // shrink from 2 to 1 over 3 seconds;
}

Answer 3

您将创建一个新的单一行为脚本并将其添加到您的原语中。然后，您将使用单一行为的“更新”方法（或使用协程）随着时间的推移更改对象。

单一行为必须是这样的：

public class ShrinkBehaviour : MonoBehaviour
{
    bool isNeedToShrink;
    Config currentConfig;

    float startTime;
    float totalDistance;

    public void StartShrink(Config config)
    {
        startTime = Time.time;
        currentConfig = config;
        totalDistance = Vector3.Distance(currentConfig.startSize, currentConfig.destinationSize);
        isNeedToShrink = true;
        transform.localScale = config.startSize;
    }

    private void Update()
    {
        if (isNeedToShrink)
        {
            var nextSize = GetNextSize(currentConfig);

            if (Vector3.Distance(nextSize, currentConfig.destinationSize) <= 0.05f)
            {
                isNeedToShrink = false;
                return;
            }

            transform.localScale = nextSize;
        }
    }

    Vector3 GetNextSize(Config config)
    {
        float timeCovered = (Time.time - startTime) / config.duration;
        var result = Vector3.Lerp(config.startSize, config.destinationSize, timeCovered);
        return result;
    }

    public struct Config
    {
        public float duration;
        public Vector3 startSize;
        public Vector3 destinationSize;
    }
}

为了使用这个，你必须做下一步：

public Cylinder()
{
    GameObject cylinder = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
    var shrink = cylinder.AddComponent<ShrinkBehaviour>();
    shrink.StartShrink(new ShrinkBehaviour.Config() { startSize = Vector3.one * 10, destinationSize = Vector3.one * 1, duration = 20f });
    cylinder.transform.position = new Vector3(3, 0, 0);

    cylinder.GetComponent<MeshRenderer>().material.color = Random.ColorHSV();
    Destroy(cylinder, 30.0f);
}

您必须记住，monobehaviour-script 必须在单独的文件中，并且必须具有与 monobehaviour-class 名称相似的名称。例如，ShrinkBehaviour.cs；