// ----------------- HF_Torus macro
#declare Fn_1 =
 function(x, y, z)
  {1-(-f_snoise3d(x*3,y*3,z*3)*0.8)}

object{ //---------------------------
HF_Torus( Fn_1, //Function,
           0, // UseUVheight:  0 or 1
           1, // UseUVtexture: 0 or 1
           <50,50>, // Resolution,
           1, // Smooth: 0 or 1
           "",// FileName, ""=no file,
           <0,0,0>,   // EndA,
           <0,1.5,0>, // EndB
           1.60 ,// Radius
           0.5  // Depth
         ) //-------------------------
 texture{ pigment{ checker
                   color rgb<0.5,0.1,0.85>
                   color rgb<1,0.67, 0.05>
                   scale<1,2,1>*0.05}
          finish { phong 1 reflection 0.01}
        } // end of texture
 scale<1,1,1>*1
 rotate<0,0,0>
 translate<0,0.00,0>
}  // end of HF_Torus -----------------