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.