Cannot get touch.position working for UISprite

[Jofator]

Hi there,
I have Bottom-Left Anchored UISprite object.
I want to identify Touch position over UISprite.
So I used nguiCamera.WorldToScreenPoint(sprite.worldCorners[index]); to get sprite screen position to detect touch and sprite collision.
In UnityEditor it works perfect, but once deployed to S3 and/or iPhone5
it detects X collision out of sprite gfx - about 10-20% moved to center of screen (see attachment)
Y collisions works fine.

What's wrong?
Thanks
Jofator


PS: Using NGUI 3.5.9 and FixedSize UIRoot.

[ArenMook]

What version of Unity?

[Jofator]

Latest Unity 4.3.4

[ArenMook]

I would suggest changing your PC build's aspect ratios to see if you can reproduce it there (or easier still: just aspect ratios in the editor).

WorldToScreenPoint is just a Unity function. You pass sprite.worldCorners[index] to it -- not sure what this 'index' is, but there are 4 corners total. Sprite's world-space position would be sprite.transform.position, and center would be Vector3.Lerp(corners[0], corners[2], 0.5f).