Unity坐标转换

1.屏幕转世界坐标
Vector3 Camera.main.ScreenToWorldPoint(newVector3(screenPos.x,screenPos.y,zInfo));

2.世界转屏幕坐标
Vector3 Camera.main.WorldToScreenPoint(newVector3(worldPos.x,worldPos.y,worldPos.z));

3.世界转视口坐标
Vector3 Camera.main.WorldToViewportPoint();

4.视口转世界坐标
Vector3 Camera.main.ViewportToWorldPoint(newVector3(viewPortPos.x,viewPortPos.y,zInfo));

5.视口转屏幕坐标
Vector3 Camera.main.ViewportToScreenPoint();

6.屏幕转视口坐标
Vector3 Camera.main.ScreenToViewportPoint();

7.屏幕转UI坐标:这个比较特殊，如果UI宽高和屏幕宽高一样，那么可以不用转换，直接通过屏幕坐标根据锚点赋值即可。其他情况下：
RectTransformUtility.ScreenPointToLocalPointInRectangle
(RectTransform rect,
Vector2 screenPoint,
Camera cam,
outVector2 localPoint);