#local F=function{pattern{crackle scale.01form z-x}}fog{.5rgb z/2+y}isosurface{function{min(F(x/9,exp(y*9-6)-5,z/9),F(x,y,z)-ln(z+x+.7)+y*9)/99-(3-y*7+F(x,y,z))/6e3}}plane{y,-.02finish{reflection.2+z/3}}