//Surfaces with critical points //by Adam Coffman //June 2006 camera { location <-0.875,0.525,1.2> look_at <0,0, 0> } #include "colors.inc" background{White} #declare T1=0; #declare T2=1/8; poly { 4 < 2,0,0,0,0,0,0,0,0,2+2*T2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-1,-2,0,-2*T2,-2*T1,0> sturm pigment { brick rgb <0,0,0,0,0> rgb <0,0,1,0,.6> brick_size <50,0.035,50> mortar 0.00475 translate <2,0.001125,2> } bounded_by { cylinder{<0,3,0> <0,-3,0> 0.47 } } clipped_by { bounded_by } } light_source{<0.5,20,0> White} light_source{<-40,0,0.5> White shadowless} light_source{<40,0,0.5> White shadowless} light_source{<0,0.5,40> White shadowless}