Question

所以我有一个物体，旋转得很好。但是，这是一个单击并拖动旋转。每当我将它旋转到一个位置时，它就会停留在那里，但是当我再次尝试旋转它时，它会从起点旋转，而不是从它离开的地方旋转。这是我的代码：

using UnityEngine;
using System.Collections;

public class Basket_Script : MonoBehaviour 
{
     private float baseAngle = 0.0f;

     void OnMouseDown() 
     {
         Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
         pos = Input.mousePosition - pos;
         baseAngle = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg;
         baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;
     }

     void OnMouseDrag()
     {
         Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
         pos = Input.mousePosition - pos;
         float ang = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg - baseAngle;
         transform.rotation = Quaternion.AngleAxis(ang, Vector3.down);
     }
}

我有点像菜鸟，我有点复制了这个代码并修改了它。

Answer 1

问题是你总是在旋转开始之前设置transform.rotation值完全忽略它的初始值，所以它每次从相同的起点旋转。简单的解决方案是保存鼠标按下的值，并将其应用于鼠标拖动时的整体旋转，如下所示：

using UnityEngine;
using System.Collections;

public class Basket_Script : MonoBehaviour 
{
    private float baseAngle = 0.0f;
    private Quaternion startRotation = Quaternion.identity;

    void OnMouseDown() 
    {
        Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
        pos = Input.mousePosition - pos;
        baseAngle = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg;
        baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;
        // Remember the value
        startRotation = transform.rotation;
    }

    void OnMouseDrag()
    {
        Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
        pos = Input.mousePosition - pos;
        float ang = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg - baseAngle;
        // Multiply desired rotation by starting rotation
        transform.rotation = Quaternion.AngleAxis(ang, Vector3.down) * startRotation;
    }
}

希望这有帮助。

对象不会从其上一个位置

1 个答案: