Handling different resolutions?

Welcome to the world of Android development: one platform, millions of different device configurations :)

Generally speaking, it's not resolution that presents the problem: a game running on a 320x240 screen and one running on a 640x480 screen should show the same extents - Unity does that for you automatically. But the problem is when aspect ratio changes: what do you show on a screen that is, say, 640x600? What to do with the 120 pixels or extra "height"?

There's no universal way to handle different screen sizes: scaling, letterboxing, zooming are all options. In your question, you want to know the worldspace coordinates of the four corners of the visible camera viewport - is that right?

Yes pretty much. I guess now it zooms in when it finds a different aspect ratio, which is not desirable as some stuff is left out of the screen. Apparently it seems harder than I thought so I'm gonna have to do some research about this..thanks :)

So now the weirdest thing is happening to me. I used width and height to and then converted it using ScreenToWorldPoint. For some reason when I instantiate moving objects it works fine, but still objects do not show on the screen, even though they are instantiated in the object hierarchy. Then if I log the position generated by ScreenToWorldPoint, and instantiate them on that position they show. Has this ever happened before?

Thanks

Are you doing anything with scale anywhere, if anything that relates to the placing procedure is not at a scale of (1,1,1) you can get odd behavior...?

well I change the scale in a lot of the objects, I didn't know that's bad..although now I changed the object I'm trying to instantiate to 1,1,1 and it's still not showing.