POV-Ray Geometric Shapes

disc{ ...} - flat disc, center hole cutout optional
built-in shape, non-CSG

//Syntax: -----------------------
disc{ <center>,
      <normal vector>,
      outer radius,
      hole radius //(optional!)}
    } //-------------------------

// ------------------------------------
disc{ <0,0,0>, <0,1,0>, 1.0, 0.4
      texture{
        pigment{ color rgb<0.8,0.5,1.0>}
        normal { bumps 0.5 scale 0.025}
        finish { phong 1}
             } // end of texture
       scale <1,1,1>
       rotate <0,0,0>
       translate <0,0.01,0>
     } // end of disc -----------------