#declare T_Map = // transparency map --
pigment{
  image_map{ jpeg "Wire_Net_01.jpg"
             interpolate 2 }//
  warp{ cylindrical
        orientation 1 dist_exp 1}//
  scale 0.09 //0.135
} // ----------------------------------
#declare Opaque_Texture   =
texture{ pigment{ color rgb<1,1,1>*.05}
         finish { phong 0.2 }
       } // ---------------------------
#declare Surface_Material  =
material{
  texture{
    pigment_pattern{ T_Map }
    texture_map{
     [0.0 pigment{rgbf<1,1,1,1>}]
     [1.0 Opaque_Texture  ]
    } // end texture_map
  }// end texture
}// end material ----------------------
// ------------------------------------
difference{
 cylinder{<0, 0  ,0>,<0,1.535,0>,0.700}
 cylinder{<0,-0.1,0>,<0,1.536,0>,0.699}
 material{ Surface_Material
           scale <1,3.89,1>
           translate<0,0.015,0>}
 rotate<0,30,0>
} // end of cylinder ------------------
torus{ 0.700, 0.0075
       translate<0,0.005,0>
       texture { Opaque_Texture }
     } //------------------------------
torus{ 0.700, 0.0075
       translate<0,1.535,0>
       texture { Opaque_Texture }
     } //------------------------------