#macro F(A,B,C,D)sphere{A,B hollow interior{media{emission C intervals 99density{marble turbulence D color_map{#end F(0,5,1,.5)[.9rgb 0][.93rgb x+z][.97rgb 2]}}}}}F(.3*z,.06,9,8)[.5rgb z][.7rgb 0]}}}}pigment{rgbt 1}finish{reflection{.2,.4fresnel}}}