isosurface{ //------------------------- function { f_spiral( x,y,z, 0.2, // distance between windings, 0.02, // thickness, 0.9, // outer diameter of the spiral, 0, // not used, 0, // not used, 0.0 ) // cross section type } threshold 0 max_gradient 5 contained_by{ box{<-1,-0,-1>,<1,0.1,1> }} texture{ pigment{ color rgb <0.8,0.47,0.25>*0.85} normal { bumps 0.25 scale <1,0.015,1>} finish { specular 0.1 roughness 0.005 phong 1 phong_size 20 reflection {0.35 metallic } } } scale <1,10,1>*1.25 rotate <0,0,0> translate <0,0.0,0> } // end of isosurface ----------------