Don’t worry and thanks for help. Yes, it is a common technique and that’s exactly what I’m doing right now but good job with coming with such idea yourself 
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The good thing is that with current JFlow generating high-res simulations is a matter of minutes so there shouldn’t be problem with the generation itself, but the bad thing is handling such amounts of data during the training and in terms of hard-drive space.
Anyways I’ll experiment with different techniques and hopefully come up with something performant and good looking.