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How does the Anisotropic Textures Quality Setting affect each texture's Aniso Level?

Updated
Symptoms:
 
  • I do not understand how the Anisotropic Textures field affects the Aniso Level for each of my textures.
  • The anisotropic filtering for my textures is not what I expected.
 
Cause:
 
The Anisotropic Textures field (Edit > Project Settings > Quality > Anisotropic Textures) has the options Disabled, Per Texture, and Forced On. It can be confusing how this relates to each texture's Aniso Level exposed in the Texture Importer.
 
Resolution:
 
In the Texture Importer, an Aniso Level of 0 or 1 means disabled; higher values represent different Anisotropic filtering levels.
 
Anisotropic Textures (found within Quality settings) can be Disabled, Per Texture, or Forced On. 
 
 
This is where Aniso Level 0 and 1 differ; 0 always means disabled, and 1 (and higher values) can be overridden by the setting in Quality settings. Forced On clamps the Aniso Level between 9 and 16 (unless a texture has Aniso Level set to 0, in which case it stays disabled for that texture).
 
More Information:
 

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