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what's "a.russell's method"? it was just an example i think. you can't use the two models like that.
I thought he was somehow blending the two models using shaders. Sorry about the misunderstanding. 
I was wondering about your alpha map method. Wouldn't it still be rendering 2 models(duplicate with alpha map and black texture, and the normal textured model) though? How would you go about doing this for an entire scene(40+) models? Mabye i'm not quite understanding it.
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