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世界空間中的點坐標轉換到屏幕坐標：

screenPos = RectTransformUtility.WorldToScreenPoint(cam, worldPos.transform.position);

UGUI物體的坐標轉換到屏幕坐標:

screenPos = RectTransformUtility.WorldToScreenPoint(canvas.worldCamera, uguiObj.transform.position);

屏幕坐標轉換到UGUI坐標：

Vector3 worldPoint;if (RectTransformUtility.ScreenPointToWorldPointInRectangle(rectTrans, camPos, canvas.worldCamera,out worldPoint)){　　transform.position = worldPoint;}

屏幕坐標轉換到世界空間坐標（射線碰撞位置）：

var ray = RectTransformUtility.ScreenPointToRay(worldCamera, screenPos);RaycastHit hitInfo;if (Physics.Raycast(ray, out hitInfo)){　　pos.transform.position = hitInfo.point;}