Christian Froeschlin <chr### [at] chrfrde> wrote:
> Chaanakya wrote:
>
> > As opposed to the different colors being shown throughout the object, I am only
> > seeing the different 'shells' on one side of the object, which is quite weird.
>
> your problem is that your slab is not centered on the origin.
> Therefore, your "scale 1.00001" resolves the coincident surface problem
> for the inner surface in the opposite direction you're expecting.
>
> You might try something like this:
>
> #version 3.6;
> #include "colors.inc"
>
> global_settings {
>    assumed_gamma 1.0
>    ambient_light White
>    max_trace_level 256
> }
>
> camera {
>    location <0,1,3>
>    look_at <0,0,0>
> }
>
> light_source {
>    <100,100,0>
>    color White
> }
>
> #declare base = difference
> {
>    cylinder { <-1,0,0>,<1,0,0>,1.5 }
>    cylinder { <-1.00003,0,0>,<1.00003,0,0>,1 }
>    // center desired target part on origin
>    translate -1.25*z
> }
>
> #declare curved = union
> {
>    #declare I = 1;
>    #while (I < 5)
>      #declare D = 0.1*I;
>      intersection
>      {
>        object {base}
>        difference
>        {
>          box {<-D,-D,-0.5>,              <D,D,0.5>}
>          box {<-D+0.0999,-D+0.0999,-0.6>, <D-0.0999,D-0.0999,0.6>}
>        }
>        pigment {color <2*D,0,0>}
>      }
>      #declare I = I + 1;
>    #end
> }
>
> object {curved}
>
>
>
> Note that you can use cylinders instead of boxes if you
> don't actually want the corners.
>
> Also note that for ior the best approach might be to stack solids
> without differencing away the insides. As long as each solid is
> fully contained within the outer solid all light rays should
> traverse the correct ior boundaries.

You, my friend, are awesome :D  Thank you so much :)  That's exactly what I
wanted!  This thread is now closed :)

Thanks again!

- Chaanakya

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