Pointers on learning OpenGL ES 2.0?

for next ios app, think i'd take stab @ making 3d game.

i've followed ray wenderlich's tutorial on drawing models using glkit/opengl es 2.0, i'm not sure know how go having game.

think next thing need learn how this:
how create multiple instances of single model effectively?

ideally seems have 1 file containing level explains models should placed , several other files defining each model like.

, while i'm aware things unity out there simplify process, feel might lose out on valuable learning experiences if use that.

have book opengl es 2.0 programming guide, published addison wesley, haven't looked @ in 2 years (when discovered way on head... level reading worth time now?)

 

are writing game learn opengl, or writing game write game?

if former, guess you'll have dig deep opengl (and can't ya). if latter, suppose should consider using unity or other engine takes care of lot of gritty stuff you.

 

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