Unity Ugui射线坐标转换总结

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世界空间中的点坐标转换到屏幕坐标：

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

UGUI物体的坐标转换到屏幕坐标:

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

屏幕坐标转换到UGUI坐标：

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

屏幕坐标转换到世界空间坐标（射线碰撞位置）：

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