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I am reading the paper Texture Synthesis over Arbitrary Manifold Surfaces available here.

On page $3$ on the right sight of the page they refer to isotropic and anisotropic textures. I am familiar with anistropic texture filtering, but not an actual texture itself called anisotropic.

Further they refer to an n-way symmetric texture, which I am not familiar with, and a google search did not yield any results.

I am guessing an anisotropic texture is a texture that accounts for different viewing directions (?) and perhaps an n-way symmetric texture is such a texture that accounts for $n$ different viewing directions?

If anyone could clarify these two terms that would be much appreciated. I realize this paper is from $2001$ so these terms might not still be in use.

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  • $\begingroup$ A texture where structures have a specific directionality (e.g. Fig. 7 stripes). If you compute the power spectrum of such a texture, you will see that the energy is concentrated along specific directions. $\endgroup$ – lightxbulb Apr 16 '20 at 5:24
  • $\begingroup$ @lightxbulb what is a texture spectrum? $\endgroup$ – IntegrateThis Apr 16 '20 at 5:31
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    $\begingroup$ These textures where used before anisotropic filtering appeared as a hardware feature, it's basically a hack to be make bilinear filtering more anisotropic. $\endgroup$ – PaulHK Apr 16 '20 at 5:38
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    $\begingroup$ en.m.wikipedia.org/wiki/Spectral_density An anisotropic texture has structures that are "elongated" along some direction(s). $\endgroup$ – lightxbulb Apr 16 '20 at 6:56

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