Thanks for the macro suggestions. They both worked great for color pigments.
I am trying to modify them to allow for image_maps --- at present they do
not seem to accomodate these (due to stretching and such).

Rick

"Ron Parker" <ron### [at] povrayorg> wrote in message
news:slr### [at] fwicom...
> On 15 Nov 2000 09:32:07 -0500, Ron Parker wrote:
> >On Wed, 15 Nov 2000 16:42:06 +1000, Chris Colefax wrote:
> >>This macro can be easily modified for tiling complete textures, and
extended
> >>into the third dimension (z) if needed.  The only thing to note is that
the
> >>gradient pattern is symmetrical around the origin, so the tiling breaks
> >>along the x and y axes.  This is easily avoided by translating the
pattern
> >>origin out of view.
> >
> >Or using a repeat warp, which is how I would have done it.
>
> That is,
>
>  #macro checker_pigment (Pigment1, Pigment2, Pigment3)
>          gradient x pigment_map {
>             [1/3 Pigment1] [1/3 Pigment2] [2/3 Pigment2] [2/3 Pigment3]}
>          warp {repeat x}
>          warp {repeat y offset 1/3*x}
>          scale <3,1,1>
>    #end

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