Unity Lerp 實作講解

這篇文章主要講的是如何利用 Lerp(換成 Slerp 也能運行) 來實現移動。其實有另一個更快捷的方式直接用一些 Tween 插件，例如：LeanTween，DoTween⋯⋯。

利用 Lerp 實現移動可以分成兩大種 Update 和 IEnumerator 方案。

Update()

void Update()
{
    if (Input.GetKeyDown(KeyCode.Space))
    {
        moving = true;
    }
    
    if (moving)
    {
        transform.position = Vector3.Slerp(transform.position, position, speed * Time.deltaTime);
        
        if (Vector3.Distance(transform.position, position) < 0.001)
        {
            moving = false;
        }
    }
}

IEnumerator

public IEnumerator move()
{
    float currentSpeed = speed;
    while (Vector3.Distance(transform.position, position) > 0.1)
    {
        transform.position = Vector3.Slerp(transform.position, position, currentSpeed * Time.deltaTime);
        currentSpeed += acceleration;
        
        yield return new WaitForSeconds(Time.deltaTime);   
    }
}

設定速度和加速度

IEnumerator MovementWithSpeed()
{
    float currentSpeed = speed;
    while (Vector3.Distance(transform.position, position) > 0.1)
    {
        transform.position = Vector3.Lerp(transform.position, position, currentSpeed * Time.deltaTime);
        currentSpeed += acceleration;
        
        yield return new WaitForSeconds(Time.deltaTime);   
    }
}

設定移動時間

IEnumerator MovementWithTime()
{
    float currentT = Vector3.Distance(transform.position, position) / time * Time.deltaTime;
    while (Vector3.Distance(transform.position, position) > 0.1)
    {
        transform.position = Vector3.Lerp(transform.position, position, currentT);

        yield return new WaitForSeconds(Time.deltaTime);   
    }
}

延伸閱讀

Slerp vs Lerp: https://www.faustofonseca.com/tutorial/unity-vector3-lerp-vs-vector3-slerp