Nieminen Juha wrote:
>   Ok, here it is. This should be faster than the gradient-version:
> 
> #macro Squares(p1,p2,p3,p4)
>   checker
>   pigment
>   { checker pigment { p1 }, pigment { p2 }
>     scale <.5,1,1>
>   }
>   pigment
>   { checker pigment { p4 }, pigment { p3 }
>     scale <.5,1,1>
>   }
>   scale <1,.5,1>*2
>   warp { repeat 2*x }
> #end
> 
> #declare P1=pigment { rgb x }
> #declare P2=pigment { wood turbulence .5 scale .4 }
> #declare P3=pigment { granite scale .5 }
> #declare P4=pigment { rgb z }
> camera { location -z*7 look_at 0 }
> plane
> { -z,0 pigment { Squares(P1,P2,P3,P4) }
>   finish { ambient 1 }
> }
>

I won't continue the competition for speed nor really test this,
 but it seems to me that checker is a 3D pattern, moving
in the three axes... 
Or I just misinterpret the warp... I think  you would need more
warp statement for y and z !
I'm far too incompetent with patterns included in other patterns
(I'm at a complete loose to understand where to apply correctly
a translate or scale to a pattern to do exactly what I think),
but does the warp repetition only apply to the outside pattern or
also at the computation of the internal pattern ?
If the second, then a paving of wood tiles would really be boring
and unrealistic. (but there is also this reset_child thing to look
at)....

For my patch, it is available and everybody is free to take it.
I would be please to see it in SP (or even better in the official!),
but I do not want to bother anyone and delay any releases...
(I would dreams simply of a 3.1g based SP with all the UV and photon,
and iso things...)

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