[Qt-interest] View JPEG in QGLWidget

[Constantin Makshin]

Because OpenGL is a 3D graphics API and 2D is just a prticular case of 3D.

On Tuesday, August 02, 2011 02:54:44 PM Brilliantov Kirill Vladimirovich wrote:
>> In 3D graphics view-space both X and Y coordinates lie in the [-1, 1] 
>> range, not [0, width] [0, height] (these are ranges for screen-space 
>> coordinates).
>
> Constantin, why I will must use 3D-coordinates if I work with 2D?
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