screenshot and openGL screengrab

[jojowings]

Hello to all. I'm an old 3d modeller that generally use a pletora of software. (zbrush,maya,cinema4d,alias etc). Lately I was asked to prepare some lessons and so my vision is that I prefer to teach the fundamentals of 3d poly modelling in a "universal" way instead of being softwre specific. I was searching for a lighweight, powerful and complete modeller and so I reconsider to use wing3d (already used a looot of time ago). My aspectative were not betrayed since I still believe that for polymodelling wings 3d can rival with more blasoned competitors.
I've seen that there is the options for exporting eps and thats great for preparing notes and printed materials. I can upscale to whatever I prefer, while for the screenshot (that I need to explain how I'm modelling the objs) I'm limited to the screen resolution. I know I can use a retina monitor, but I need to go really high (almost printed quality 600 dpi). Is there a workaround for obtaining it ? can I create an eps of what I see on the screen (so with colored faces, selection gizmo etc ?). Does a generic solution exist for opengl application that I can use as a workaround ? Thanks in advance for your reply and If anyone can helping me figure it out I promise I will send a copy of the book once it's finished. Otherwise I need to go back to proprietary software (blender not an alternative for this, I've tried a lot of options but wings3d work better)
Giorgio