Where that #!@&?$^*%! PI comes from

Another “educational” post: In computer graphics kindergarten, we were all taught that diffuse is: Where is a constant that determines how bright the diffuse response is. In computer graphics grade-school, we then learn about the rendering equation, and we’re given: Where is the BRDF (bidirectional reflectance distribution function). For the diffuse case, the BRDF is … [Read more…]