Hey guys!

I'm trying to create a sort-of curved slab, if you will.  You can see what I
mean by compiling this code:

#version 3.6;
#include "colors.inc"

global_settings {
  assumed_gamma 1.0
  ambient_light White
  max_trace_level 256
}

camera {
  location <0,0,-2>
  look_at <0,0,0>
}

light_source {
  <100,100,0>
  color White
}

#declare a =
  difference {
    cylinder { <-1,0,0>,<1,0,0>,1.00003}
    cylinder { <-1.00003,0,0>,<1.00003,0,0>,1}
    plane { z,0 }
    pigment { color Red }
    rotate <0,90,0>
    rotate <90,0,0>
  }

object { a }

Now, I want to build the same figure, but piece by piece - start in the middle
and work outwards, with each part being a different color.  I thought I could
modify the object "a" with some more difference statements and I've made quite a
bit of progress on this.  However, there is one sticking point:  when I render
the following code, I get one part of the center-most piece sticking out of the
next larger one.

#version 3.6;
#include "colors.inc"

global_settings {
  assumed_gamma 1.0
  ambient_light White
  max_trace_level 256
}

camera {
  location <0,0,-2>
  look_at <0,0,0>
}

light_source {
  <100,100,0>
  color White
}

// plane {
//   y, -10
//   pigment { hexagon Green, White, Blue }
// }

// box {
//   -0.5, 0.5
//   pigment { checker Red, Blue }
// }

#declare curved_1 =
  difference {
    cylinder { <-1,0,0>,<1,0,0>,1.00003 }
    cylinder { <-1.00003,0,0>,<1.00003,0,0>,1 }
    plane { z,0.9 }
    plane { -y,0.1 }
    plane { -y,-0.1 }
    plane { x,-0.1 }
    plane { -x,-0.1 }
    // rotate <0,90,0>
    // rotate <90,0,0>
  }

#declare curved_2 =
  difference {
    cylinder { <-1,0,0>,<1,0,0>,1.00003 }
    cylinder { <-1.00003,0,0>,<1.00003,0,0>,1 }
    plane { z,0.8 }
    plane { -y,0.2 }
    plane { -y,-0.2 }
    plane { x,-0.2 }
    plane { -x,-0.2 }
    // rotate <0,90,0>
    // rotate <90,0,0>
  }

object { curved_1 pigment { color Blue } }

object { curved_2 pigment { color Red } }

See how you can see the blue?  It doesn't make sense! I'm trying to figure out
why, when I cut it symmetrically with respect to the origin, this occurs.

Thanks in advance!

- Chaanakya

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