Do atlases get split into pages? What happens behind the scenes if I have super large atlases ( >2048)?
No, they are not split. Images are joined into one single texture. If you have too large atlases the graphics hardware is unable to deal with it. The limit is depending on the platform. 2048x2048 is fine on any platform though.
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More discussions and nice stats and graphs can be found in this post: Supporting 4096x4096 textures on different devices
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