Eam yeah difficult story, Let me just totally rip it of an article I found:
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In short, it's an uncomplicated set of criteria appropriate to the entire game related images that create certain they conform to a series of customary dimensions. Characteristically this means doubling up or dividing down by two. So texture sizes that encompass or are limited to "8", "16", "32", "64", "128", "256", "512", "1024", "2048" (or higher for additional modern games) in one or supplementary width/height direction are regarded as being applicable and appropriately optimized for quick loading into a game and processing into memory.
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And that's pretty much how most of today's game engines work.
