Warp <war### [at] tagpovrayorg> wrote:
> D103 <nomail@nomail> wrote:
> > disc { 0, y, 100 pigment { cylindrical pigment_map { [ 0 rgb 1 ] [ 0.5 rgb <1,
> > 1, 0.5> ] [ 1 rgbt 1 ] }
> > } finish { ambient 1 } rotate z*90 translate LiPo }
>
>   Your pigment makes a small circle of radius 1 at the center of a huge disc
> of radius 100.
>
>   Make your disc have a radius of 1, then apply the pigment, then scale it
> up to 100. (And you might want to use a color_map instead of a pigment_map.)
>
> --
>                                                           - Warp

I have done as you suggested with the disc, and got a relatively successful
result. It still needs some adjusting, but I think you've put me on the right
track.

Thanks very much everyone who's helped.

D103

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