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I'm curious, does the anisotropic texture filtering increase the memory usage? And how to calculate it?

+1  A: 

AFAIK it doesn't, but it requires mipmaps, which increase the texture memory usage by 33%.

Matias Valdenegro
I meant compared to normal mip mapped textures. Why is there limits on the max_anisotropy if it doesnt need more memory etc.
Newbie
Because it requires more processing power, which affects performance.
Matias Valdenegro