unity中拖拽随意的对象

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孙广东 2015.8.16

目的 : 我们能简单的通过鼠标位置得到目标对象假设没有使用刚体组件

Step - 1: 在3D项目中设置场景. 一个空对象命名为： DragAndDrop ，和创建一些其它的游戏对象如 sphere, cube 等

- 感觉例如以下l;

Step - 2: C# 脚本命名为 "GameobjectDragAndDrop".

Step - 3: 加入方法：

GameObject ReturnClickedObject(out RaycastHit hit)
{
GameObject target = null;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray.origin, ray.direction * 10, out hit))
{
target = hit.collider.gameObject;
}
return target;
}

Step - 4: 在Update 方法中

void Update()
{ if (Input.GetMouseButtonDown(0))
{
RaycastHit hitInfo;
target = ReturnClickedObject(out hitInfo);
if (target != null)
{
isMouseDrag = true;
Debug.Log("target position :" + target.transform.position);
//Convert world position to screen position.
screenPosition = Camera.main.WorldToScreenPoint(target.transform.position);
offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z));
}
} if (Input.GetMouseButtonUp(0))
{
isMouseDrag = false;
} if (isMouseDrag)
{
//track mouse position.
Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPosition.z); //convert screen position to world position with offset changes.
Vector3 currentPosition = Camera.main.ScreenToWorldPoint(currentScreenSpace) + offset; //It will update target gameobject's current postion.
target.transform.position = currentPosition;
} }