number 1: Would anyone care to explain to me the reasoning behind the code for the bresenham circle algorithm? I am somewhat confident that I comprehend the idea, but I can't find any good information about the code itself with the 4's and 6's and 10's... anyway, can anyone help? number 2: Does anyone know of a good, comprehensive but technical, resource for reading about high-quality normal maps, texture maps, and possibly even other maps for parametric surfaces? By high quality I mean NOT demo work-arounds, but really mathematically accurate maps blah blah blah.

thanks