Can someone explain to me why I get a "thick-walled tube" with the
following code?


#declare actuald=2;//d*0.125;

#declare scopey=
union{
        difference{
                cylinder {<0,0,-0>,<0,0,3>,actuald+.000000100}
                cylinder {<0,0,-.1>,<0,0,3.1>,actuald}
                pigment{Brown} finish {ambient 0.8}
                }
        }

object {scopey rotate <0,0,0>}

camera {
   location <0, 0, -15> //was z of 15
       angle 22
   look_at <0,0,60>
}


light_source { <80, 1620, 80> color White }
light_source { <-4000, -400, -4000> color White*.6 }

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