frozen wrote:

> Correct me, if I'm wrong, but it seems impossible to create archs with a
> sharp upper end?  
> 
Not impossible but I confess it was harder than I expected:

intersection {

         intersection {

                 union {
                         cylinder {
                           -1*z, 1*z, 1


                         }
                         box { <-1,-1,-1> <1,0,1>  }

                         translate x*-.30
                 }

                 union {
                         cylinder {
                           -1*z, 1*z, 1


                         }
                         box { <-1,-1,-1> <1,0,1>  }

                         translate x*.30
                 }

         }

         box { <-1.1,-1.1,-0.9> <1.1,2,0.9> }

         pigment {
              rgb 1
             }
}

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