Am not really a newbie, thought I had CSG sussed.  However !!!
Can not see the reason I get a hollow object from the following code. See 
attached picture
All help appreciated
Bob

#############################################################################
#version 3.6;
#include "colors.inc"
global_settings { assumed_gamma 1.0}
// ----------------------------------------
#local cam_type = "t";
#if (strcmp(cam_type, "f") = 0)  // f = from front
     #local cam_location = <0.0, 0.5, -3.0>;
     #local cam_look_at  = <0.0, 0.5,  0.0>;
#end
#if (strcmp(cam_type, "t") = 0)        // t = from top
     #local cam_location = <0.0, 4.5, -0.1>;
     #local cam_look_at  = <0.0, 0.0,  0.0>;
#end
camera {
  direction 1.5*z
  right     x*image_width/image_height
  location  cam_location
  look_at   cam_look_at
}

sky_sphere {
  pigment {
    gradient y
    color_map {
      [0.0 rgb <0.6,0.7,1.0>]
      [0.7 rgb <0.0,0.1,0.8>]
    }
  }
}
plane { y, 0
        pigment { checker
                pigment { color rgb <0.7,0.0,0.0> }
                pigment { color rgb <1.0,1,1> } }
  }
light_source {<0, 0, 0> color rgb <1, 1, 1>  translate <-0.1, 100, -0.2>}
light_source {<0, 0, 0> color rgb <1, 1, 1>  translate <-5, 5, -0.2>}
// -------------------------------------------------------------------
intersection {
    cylinder { <0, -1, 0>, <0, 1, 0>, 1 translate -0.5*x }
    cylinder { <0, -1, 0>, <0, 1, 0>, 1 translate  0.5*x }
    pigment  { Yellow }
  }

############################################

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