isosurface{ //------------------------- function { f_spiral( x,y,z, 0.2, // distance between windings, 0.05, // thickness, 0.9, // outer diameter of the spiral, 0, // not used, 0, // not used, 0.45 ) // cross section type } threshold 0 max_gradient 5 contained_by{sphere{<0,0,0>,1}} texture{ pigment{ color rgb<0.8,0.75,0.5>*0.8} finish { specular 0.2 phong 0.7 reflection{ 0.3 metallic } } } // end of texture scale <1,1,1>*1.25 rotate <0,0,0> translate <0,0.05,0> } // end of isosurface ----------------