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I'm working on a project that uses an isometric hex grid. using a virtual display, I can identify a hex from a given pixel. However, my routines don't work in the percentage system because I don't know how to convert the values I get from ScreenToWorld() into a pixel.

In the screenshot below, I have the mouse pointer near the bottom right of the screen. The first pair of floats is the (x, y) screen location of the mouse. The second pair of floats is the result I get from using ScreenToWorld(GetPointer()). So 99% of the screen X corresponds to 92% of something... but what exactly?

Can't see your screenshot... you can attach screenshots to your post and then edit your post to reference the image using the "image" button.

You have 2 options:
1-Don't use the percentage system. Use SetVirtualResolution instead
2-Calculate the size of a pixel in x and y

Thanks for the tip, I'll try it. I normally host my pictures in DropBox and link to that, but I've been having difficulty getting them to display. I don't know if the issue is this forum or DropBox, which has changed a bit since the last time I was heavily putting images in forum posts.

I want to keep the percentage system since I can guarantee that my app is full-screen no matter what size device is used, and I have code in place to make sure that if a graphic is a certain size, it remains that size no matter what aspect ratio is present. I'm very happy with the results except for the occasional hiccup like this. I'll try your suggestion for calculating pixel sizes- currently I'm deriving pixel locations from the known size of the background (which may or may not be larger than the screen) but that process is breaking down in this case.

EDIT: Fixed the picture, thanks for the tip!