On Apr 21, 2014, at 15:23 , Eric Shepherd <the.she...@gmail.com> wrote:

> I added code to dump the Y-coordinate of my mouse while I move it around in 
> the NSOpenGLView, and sure enough, it's reaching the value that should be the 
> bottom edge well above the bottom. 

Are you sure you’re using the correct coordinate conversions? Based on what 
Graham said, there are actually 3 coordinate systems involved — the content 
view coordinates, the content (i.e. non-frame) coordinates, and the frame 
coordinates. Officially AFAIK there are only 2 coordinates systems (frame and 
content). If you’re accidentally mixing coordinate systems, perhaps you don’t 
need to adjust the calculations, but just use a different conversion?

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