I'm curious as to how anisotropic reflection is calculated for different hair types as well. I know in some modeling softwares there are many settings that can be applies to hair to make it appear coarser or thinner, or to generate locks. Are the ways properties are assigned to hair similar to the ways properties are dealt with on other materials?
One of the last lectures in the course will be roughly 1/3 about hair scattering--it turns out that there is a lot of interesting stuff going on there!
Parts of how hair scatters light are similar to other materials in that hair can be modeled as a rough interface that is filled with pigment that absorbs light, which is similar to other things. By that point in the class we will have developed the ideas that let us look at light transport in a way that both applies to macro-scale, like a room or an environment, and micro-scale, like hair.
Woah that's super interesting! I really love Sreya's comment about modeling different types of hair and how this affects light scattering, and I can't wait to learn more.
Something that I'm really fascinated by is the anisotropic reflection from light scattering off of morpho butterfly wings, as talked about in the following article ~ https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.497.4956&rep=rep1&type=pdf
It deals a lot with multiple thin-film interference, and how we can try to mimic the complex periodical nano tree-like structures within the butterfly wings that create the brilliant blue morpho color without the need for pigment. I think it's amazing that researchers were able to delve into the microscopic/nano scale realms to form a model for rendering the wings. Such a great intersection between different fields ~ closely observing the wonders of nature, and attempting to mimic it as much as possible through math and physics, and rendering with the magic of graphics! :)