通过旋转另一个对象（手 VR）来旋转一个对象（模型）

Question

我正在让一个物体随着手的旋转角度旋转。它运行良好，我能够旋转 3D 模型对象。不幸的是，现在我只希望对象在其 z 轴上旋转。我正在尝试使用 Quaternion.Euler (0, 0, rot.eulerAngles.z); 但不起作用，模型在所有 3 个轴上旋转。我该如何解决？

    public GameObject targetHand;

    [Header ("3D Model")]
    public GameObject powerSwitch;

    [Header ("Hand to 3D Model")]
    public float activationDistance;
    private Quaternion currentRot;
    private Vector3 startPos;
    private bool offsetSet;

    void Update () {

            if ((IsCloseEnough ())) {
                Rotate ();
            } else {
                offsetSet = false;
            }
        
    }
    void Rotate () {

        SetOffsets ();

        Vector3 closestPoint = Vector3.Normalize (targetHand.transform.position - powerSwitch.transform.position);
        var rot = Quaternion.FromToRotation (startPos, closestPoint);
        rot = Quaternion.Euler (0, 0, rot.eulerAngles.z); //Not working when I do this, why?
        powerSwitch.transform.rotation = rot * currentRot;

    }

    void SetOffsets () {
        if (offsetSet)
            return;

        startPos = Vector3.Normalize (targetHand.transform.position - powerSwitch.transform.position);
        currentRot = powerSwitch.transform.rotation;

        offsetSet = true;
    }

    bool IsCloseEnough () {
        if (Mathf.Abs (Vector3.Distance (targetHand.transform.position, powerSwitch.transform.position)) < activationDistance)
            return true;

        return false;
    }

Answer 1

您想限制围绕该轴的旋转。

我创建了一个Extension Method 来像这样钳制每个轴，从而使该功能在项目中的任何位置都可用。

public static class MyExtensions // Name it what you like I just use this
{
    public static Quaternion ClampRotationAroundZAxis(this Quaternion q)
    {
        if (!Mathf.Approximately(q.w, 0f)) // Cannot divide by 0f
        {
            // Check values are not 0f before trying to divide them
            q.x = !Mathf.Approximately(q.x, 0f) ? q.x /= q.w : q.x;
            q.y = !Mathf.Approximately(q.y, 0f) ? q.y /= q.w : q.y;
            q.z = !Mathf.Approximately(q.z, 0f) ? q.z /= q.w : q.z;
            q.w = 1f;
        }
        
        // Clamp other rotations
        q.x = 0f;
        q.y = 0f;

        return q; // Return self
    }
}

// Usage
rotation.ClampRotationAroundZAxis();

编辑：向 OP 显示使用情况

如果我以正确的方式让它们匹配，您可以像这样匹配它，否则在设置 dir 时交换顺序

Vector3 dir = (powerSwitch.transform.position - targetHand.transform.position).normalized;
Quaternion rot = Quaternion.LookRotation(dir, Vector3.up).ClampRotationAroundZAxis();
powerSwitch.transform.rotation = rot;

Answer 2

不敢相信它是多么简单。

要旋转事物，只需 .z 轴，您应该保留其他轴。示例：

Transform target;

transform.eulerAngles = new Vector3(transform.eulerAngles.x, transform.eulerAngles.y, target.eularAngles.z);

只使用目标 z。