How to convert the world position to a position on the screen?

[Syberex]

I'm working on gunsight. Did

1. Vector3 viewpos = gameCamera.WorldToViewportPoint(target.position);
2. Vector3 screenpos = UICamera.currentCamera.ViewportToScreenPoint(viewpos);
3. gunSightPanel.localPosition = new Vector3 (screenpos.x, screenpos.y, 0);
4.  

... at 800*480 works, and by 480*320 is not correctly positioned sight.
(UIRoot is not automatic, manual height = 480. UICamera is ortho, size =1.)
How to fix this?

Sorry for bad english 

[ArenMook]

UICamera.currentCamera only works in the event callbacks such as OnDrag, OnClick, etc. Outside of those callbacks you need to explicitly specify which camera to use.

[Syberex]

This is not fixed bag 

[ArenMook]

Since you mentioned your UIRoot is not automatic, you need to take your size into account:

1. float multiplier = uiroot.manualHeight / Screen.height;
2. gunSightPanel.localPosition = new Vector3 (screenpos.x * multiplier, screenpos.y * multiplier, 0);

[Syberex]

1. float multiplier = (float) uiroot.manualHeight / (float) Screen.height;
2. gunSightPanel.localPosition = new Vector3 (screenpos.x * multiplier, screenpos.y * multiplier, 0);
3.  

Thanks ArenMook!