[PD] Gem coordinates / OpenGL

[chris clepper]

Just to make things clear, GEM uses nothing but standard OpenGL API
functions.  We didn't make the coordinate system, so you have the same vague
GL dimensions as any other GL based app around.  Feel free to change the
view perspective with the 'perspec' message detailed in the gemwin help
patch (in the viewing subpatch).

cgc
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