Scattering has long been key to making realistic looking rendered images. One of my favorite papers: http://www.graphics.stanford.edu/papers/bssrdf/bssrdf.pdf

Scattering has long been key to making realistic looking rendered images. One of my favorite papers: http://www.graphics.stanford.edu/papers/bssrdf/bssrdf.pdf http://www.graphics.stanford.edu/papers/bssrdf/bssrdf.pdf which I think is the first time I learned that rendering milk is a tricky problem.