We have a funny discussion here at the office about what kind of materiales have anisotropy, I think that only raw metals and some types of fabric (silk) would have anisotropy, and my friend says that plastic laminate, wood, polished ceramic floors, and plastic laminate brushed surfaces.
Im always looking to improve my materials and if some one knows about this it would be really helpful
THX!
depends on your definition of anisotropy, could be anything from "almost all" to "almost none". Anisotropy emerges when the material structure is different in one direction than from another - i.e. when you rotate random small part of the material, and compare to another random part of the material, then if you can tell the two parts have different rotation, the material is anisotropic. Now there can be a discussion about what scales are we talking about, what material properties must change (optical vs. mechanical), ...
I guess you are talking about the anisotropic reflection parameter in Corona/vray. That one is tricky, because it is typically used to simulate mesoscopic details (not really big but not really small). With advanced enough normal/bump map filtering Corona wouldnt need anisotropy parameter, because you would be able to simulate it with a fine bump map with the same efficiency - so by this definition you could say that no real world objects have anisotropy, because you can always replace it with bump. But there are still metals that tend to break in single direction, crystals that change colors based on rotation, and all that weird stuff ;)
