subject in pov-ray.general

#macro Half_Rounded_Cylinder(Lenght,Radius,Hollow_Radius)
 union {
       // the hollow cilinder
       difference {
                  union {
                      cylinder {<-Lenght/2,0,0>,<Lenght/2,0,0>,Radius}
                      sphere {<-Lenght/2,0,0>,Radius}
                      sphere {< Lenght/2,0,0>,Radius}
                      }
                  cylinder {<-Lenght/2,0,0>,<Lenght/2,0,0>,Hollow_Radius}
                  sphere {<-Lenght/2,0,0>,Hollow_Radius}
                  sphere {< Lenght/2,0,0>,Hollow_Radius}
                  plane {-y,0}
                  }
       // rounded borders
       cylinder {<-Lenght/2,0,Hollow_Radius+((Radius-Hollow_Radius)*.5)>,
                 <Lenght/2,0,Hollow_Radius+((Radius-Hollow_Radius)*.5)>,
                 (Radius-Hollow_Radius)/2}
       cylinder {<-Lenght/2,0,-Hollow_Radius-((Radius-Hollow_Radius)*.5)>,
                 <Lenght/2,0,-Hollow_Radius-((Radius-Hollow_Radius)*.5)>,
                 (Radius-Hollow_Radius)/2}
       difference {
         union {
               torus
{Hollow_Radius+((Radius-Hollow_Radius)*.5),(Radius-Hollow_Radius)*.5 translate
-x*Lenght/2}
               torus
{Hollow_Radius+((Radius-Hollow_Radius)*.5),(Radius-Hollow_Radius)*.5 translate
x*Lenght/2}
               }
         cylinder {<-Lenght/2,0,0>,<Lenght/2,0,0>,Radius}
         } // end of torii csg

       pigment {Tan}
       finish {phong .6 reflection .1}
       }
#end

object { Half_Rounded_Cylinder(4,1.5,1.2) translate y*1.33 rotate y*-25}

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