"Chaanakya" <nomail@nomail> wrote:
> 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

Never mind.  I fixed it by changing plane { -y,0.2 } and plane { -y,0.1 } to
plane { y,-0.2} and plane {y,-0.1 }.

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