import graph3; import palette; size(300,300,keepAspect=true); real w=0.4; real f(triple t) {return sin(t.x);} triple f1(pair t) {return (cos(t.x)-2cos(w*t.y),sin(t.x)-2sin(w*t.y),t.y);} triple f2(pair t) {return (cos(t.x)+2cos(w*t.y),sin(t.x)+2sin(w*t.y),t.y);} triple f3(pair t) {return (cos(t.x)+2sin(w*t.y),sin(t.x)-2cos(w*t.y),t.y);} triple f4(pair t) {return (cos(t.x)-2sin(w*t.y),sin(t.x)+2cos(w*t.y),t.y);} surface s1=surface(f1,(0,0),(2pi,10),8,8,Spline); surface s2=surface(f2,(0,0),(2pi,10),8,8,Spline); surface s3=surface(f3,(0,0),(2pi,10),8,8,Spline); surface s4=surface(f4,(0,0),(2pi,10),8,8,Spline); pen[] Rainbow=Rainbow(); s1.colors(palette(s1.map(f),Rainbow)); s2.colors(palette(s2.map(f),Rainbow)); s3.colors(palette(s3.map(f),Rainbow)); s4.colors(palette(s4.map(f),Rainbow)); draw(s1); draw(s2); draw(s3); draw(s4);