Thanks, I've always wanted to do that but haven't.
I fooled around with three dimensional matrices
but they didn't work very well.

I think when your Grid macro is used it should be:

Grid( pigment{rgbf 1} , pigment{rgb 0}, 0.1)

adding that one letter makes a big difference :-)
(and I don't mean correcting the typo }   ;-)

Harold


news:h2on4uchrebp72ojaeogltpd00vuv2ll2b@4ax.com...
> What about something like:
>
> #macro Grid(Pig1,Pig2,Size)
>   #local Pig3=pigment{
>     gradient z
>     pigment_map{
>       [Size/2 Pig2]
>       [Size/2 Pig1]
>       [1-Size/2 Pig1]
>       [1-Size/2 Pig2]
>     }
>   };
>   plane{
>     y, -1
>     pigment{
>       gradient x
>       pigment_map{
>         [Size/2 Pig2]
>         [Size/2 Pig3]
>         [1-Size/2 Pig3]
>         [1-Size/2 Pig2]
>       }
>     }
>   }
> #end
>
> Grid( pigment{rgb 1} , pigment{rgb 0}, 0.1}
>

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