unity 滑鼠拖拽物體移動
private Camera cam;//發射射線的攝像機
private GameObject go;//射線碰撞的物體
private Vector3 screenSpace;
private Vector3 offset;
private bool isdrage = false;
void Start()
{
cam = Camera.main;
}
void Update()
{
if (isdrage == false)
{
//整體初始位置
Ray ray = cam.ScreenPointToRay(Input.mousePosition);
//從攝像機發出到點選座標的射線
RaycastHit hitInfo;
if (Physics.Raycast(ray, out hitInfo))
{
//劃出射線，只有在scene檢視中才能看到
Debug.DrawLine(ray.origin, hitInfo.point, Color.red);
go = hitInfo.collider.gameObject;
screenSpace = cam.WorldToScreenPoint(go.transform.position);
offset = go.transform.position - cam.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
}
}
//拖拽物體不能為空
if (go != null)
{
//拖拽
if (Input.GetMouseButton(1))
{
Vector3 currentScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
Vector3 currentPosition = cam.ScreenToWorldPoint(currentScreenSpace) + offset;
go.transform.position = currentPosition;
isdrage = true;
}
else
{
//結束後，清空物體
go = null;
isdrage = false;
}
}
}