I think you're confusing texture interpolation with mipmapping. Texture 
interpolation, what "interpolate" does, is only visibly if 1 
texture-pixel (texel?) fills more than 1 screen-pixel (screxel?). 
Mipmapping (not natively supported by POV-Ray) kicks in when the 
opposite is true.

It is possible to simulate mipmapping in POV-Ray, but it's not very easy 
and doesn't work under all circumstances. It's much easier (but possibly 
much slower) to just use higher anti-aliasing settings.

-- 
ZK

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