Unity3D中的动量和惯性

Question

所以，当我松开钥匙的时候，控制器停了下来，就像撞到墙上一样，我试着改变它，但唯一改变的是，每当我按下一个键，它就会被扔到外层空间：

    float x = Input.GetAxis("Horizontal");
    float z = Input.GetAxis("Vertical");
    Vector3 newMovement = transform.right * x + transform.forward * z;
    momentum = new Vector3(characterController.velocity.x, 0, characterController.velocity.z);
    newMovement.y = 0;
 if (!newMovement.normalized.Equals(momentum.normalized))
        {
            
            Debug.Log("new" + newMovement.normalized);
            Debug.Log(momentum.normalized);

            momentum = (momentum.magnitude - 2f) > 0 ? momentum.normalized * (momentum.magnitude - 2f) : Vector3.zero;
            

            if (newMovement.x == momentum.x)
                momentum.x = 0;



            if (newMovement.z == momentum.z)
                momentum.z = 0;



            
        }
        else
            momentum = Vector3.zero;
        characterController.Move((newMovement * speed + velocity + momentum) * Time.deltaTime);

另外，由于某种原因，即使有时两个向量相等，它们也会通过if语句(我尝试使用！=)(这两个向量都记录在if语句的前2行)。

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Answer 1

使用https://docs.unity3d.com/ScriptReference/Vector3.SmoothDamp.html，它将逐渐减缓移动到零，这取决于smoothTime的值

public float smoothTime = 0.3F;
private Vector3 velocity = Vector3.zero;
private Vector3 newMovement;

void Update()
{
    newMovement = transform.right * x + transform.forward * z;
    transform.position = Vector3.SmoothDamp(transform.position, targetPosition, ref velocity, smoothTime);
}