Sorry I didn’t see your second reply.
I like to find lame excuses to post lame gifs … 
screen_to_mesh.gh (5.3 KB)
I must remember to whoever will use this that i’m still learning c# … it might contain errors that might cause unknown further problems… I’m just clashing codes together.
- Turn it on;
- click “Set area” button and do 1 click for top-left corner and a second click for bottom right one;
- optional visible rectangle
Outputs are:
A - mesh with X and Y sizes -1 of screen portion captured (each pixel become 1 vertex) , so pixel count and mesh quad faces count are different
B and C - sizes of the screen portion