Marmoset's articles are a great intro. Probably the most accessible I've found. If anyone wants to read a lot more, here's a collection of possibly a majority

Marmoset's articles are a great intro. Probably the most accessible I've found. If anyone wants to read a lot more, here's a collection of possibly a majority of the non-academic material to be found online: https://interplayoflight.wordpress.com/2013/12/30/readings-on-physically-based-rendering/ https://interplayoflight.wordpress.com/2013/12/30/readings-o...